Joseph C. Bequaert.
Descriptions of Three New Neotropical Species of Chrysops (Diptera, Tabanidae).
Psyche 53(1-2):6-12, 1946.

This article at Hindawi Publishing: https://doi.org/10.1155/1946/54672
CEC's scan of this article: http://psyche.entclub.org/pdf/53/53-006.pdf, 520K
This landing page: http://psyche.entclub.org/53/53-006.html

The following unprocessed text is extracted automatically from the PDF file, and is likely to be both incomplete and full of errors. Please consult the PDF file for the complete article.

Psyche
[March- June
DESCRIPTIONS OF THREE NEW NEOTROPICAL
SPECIES OF CHRYSOPS (DIPTERA, TABANIDB)
Museum of Comparative Zoology, Cambridge, Mass. Chrysops zayasi, new species (Figs. 1-3) ~ewhe. - Medium-sized, of the group of C. incisu Mac- quart and closely related to C, frazari Williston. Frons about as wide as high, mostly grey pollinose; ocellar area moderately raised, extensive, denuded shiny black and nar- rowly connected medially with a shiny black upper margin of the callus; frontal callus low, yellowish-brown, separated from the eyes by narrow pollinose orbits. Fronto-clypeus shiny honey-yellow, except for the grey pollinose narrow inner orbits and upper half of cheeks; facial pits yellow; upper lateral areas (above the pits) moderately swollen, not conical. Antennae entirely black, sparsely black-haired, slender, slightly longer than fore femora; segment 1 about one and one-third times the length of 2; 3 slightly longer than 1 + 2; 1 and 2 cylindrical, scarcely swollen, but 1 slightly thicker than 2, particularly seen from above. Palpi honey-yellow. Thorax black; mesonotum with four greyish pollinose longitudinal stripes: one on each side, above the base of the wing, very wide, continuous; a median pair narrow, broadly interrupted before the scutellum, connected anteriorly with the lateral stripes. Scutellum mostly shiny brownish-yellow. Pleura with two broad, yellowish-grey pollinose longitudinal stripes, the upper one interrupted me- dially. Legs mostly pale yellowish-brown; trochanters, tips of femora and of tibiae, and tarsi more or less infuscated to black; coxae partly grey pollinose; tibiae not widened. Wings hyaline, with dark markings similar to those of C. incisa: apical spot well defined as a narrow, continuous stripe along costa, ending at apex of wing and filling in the entire marginal cell; cross- = Published by a grant from the Museum of Comparative Zoology at Har- vard College.




================================================================================

19461 New Neotropical Species of Chysops 7 band covering entire 4th posterior (which is narrower at apex than usual) and basal third of 5th posterior cell, continued to the margin along the upper side of the anal cell (which is closed at the apex) ; no hyaline spot in first submarginal cell in holo- type and one paratype (the other paratype has small, drop-line hyaline spots in the distal extension of the cross-band in the first submarginal cell, in the discal cell, and in the apical spot at the tip of the first submarginal cell; this is no doubt an abnor- mal condition; in every other respect the specimen agrees with the holotype) ; cross-band abruptly extended in the first sub- marginal cell, but ending far from the fork of the third vein; basal cells hyaline except for extreme bases and apices. Hal- teres yellowish-brown, the knobs infuscated above. Abdomen black, with a dorsal pattern of yellowish, grey pollinose mark- ings similar to that of C. jrazari, but the sides of 1st tergite extensively yellowish; median mark of tergite 2 either hour- glass-shaped or divided into two triangles; ventrally two broad, yellowish, grey-pollinose stripes, fused anteriorly to cover most of sternites 1 and 2.
Length (not including antennae), 7 to 7.5 mm.; of wing, 8 mm.
CUBA: Cienaga de Lanier, Isle of Pines, March 28, 1945 (Fernando de Zayas Collector) ; holotype and 1 paratype at M.C.Z. (No. 27434) ; 1 paratype deposited at the United States National Museum.
C. zayasi is very closely related to C. frazari of Hispaniola, a species as yet imperfectly known (see J. Bequaert, 1940, Rev. de Entomologia, XI, p. 282, fig. 1). At present it may be sepa- rated by the different shape and color of the antenna (in jrazari segment 1 and 2 are more swollen and reddish-brown) and by the color of the frontal callus (black in frazari). This interesting addition to the scant tabanid fauna of Cuba was received from Dr. S. C. Bruner, who kindly presented the holotype and one of the paratypes to the Museum of Compara- tive Zoology.
Chrysops renjifoi, new species (Figs. 4-6) Female. - Small, related to C. latitibas Krober and the species described below as C. weberi.
Frons very slightly higher than wide (appearing as wide as high in exact front view, as drawn in Fig. 51, mostly grey pol-



================================================================================

8 Psyche [March- June
hose; ocellar area very little raised, denuded, shiny black, not extended downward; frontal callus low, black, transverse, with nearly straight sides which are separated from the eyes by nar- row pollinose orbits. Fronto-clypeus shiny honey-yellow, with infuscated blotches; upper half of cheeks, very narrow inner orbits and entire outer orbits grey pollinose; facial pits yellow; upper lateral areas (above the pits) flattened convex, not coni- cal. Antennae dirty-yellowish on segment 1, fuscous-brown to blackish on 2 and 3, very slender, much longer than fore fem- ora; segment 1 about one and one-third times the length of 2; 3 scarcely longer than 1, its basal portion very little swollen; 1 and 2 cylindrical, not swollen, equally thick both from above and in profile. Palpi yellowish-brown. Thorax black, fairly shiny, lightly covered with grey pollinosity, which forms two narrow, continuous median lines on the dorsum and is more pro- nounced on the pleura and on the sides of the dorsum between the wings and the shoulders; no pleural stripes nor spots; scutellum shiny black. Legs mostly infuscated to black; much of fore femora, extreme tips of mid and hind femora, and entire hind tarsi dirty yellowish-white; all tibiae flattened convex, moderately widened. Wings fairly cloudy over most of the clearer areas, decidedly hyaline only in the two basal and the anal cells; darker markings as follows: costal and subcostal cells, very narrowly connected with the apical spot, which is poorly defined but fills in most of the apex of the wing; it is darkest close to the costa and fades gradually toward the 3d posterior cell; a very narrow, nearly hyaline streak divides it from the distal margin of the crossband, beginning well inside the marginal cell a short distance from the costa; cross-band with nearly straight distal edge, far from the fork of the third vein, divided at the hind margin by an ill-defined, semi-hyaline spot covering much of the 5th and the median portion of the 4th posterior cells; center of discal cell also somewhat paler; base of wing, extreme tips and bases of both basal cells and narrow upper margin of anal cell infuscated; stigma well de- fined, blackish-brown; anal cell broadly open at apex. Halteres black. Abdomen: 1st tergite yellowish-white, with a narrow black apical margin; 2d tergite yellowish-white over a little more than anterior half, the black hind portion extending for- ward along the sides; 1st and 2d sternites mostly pale yellow- ish; remainder of abdomen shiny black, without markings;



================================================================================

19461 New Neotropical Species of Chrysops 9 yellow of 1st and 2nd tergites slightly grey pollinose, the 1st on each side with a prominent yellowish pollinose spot; all tergites with a few, scattered, short white hairs. Length (not including antennae), 5 mm.; of wing, 5.8 to 6 mm:
COLOMBIA: Veneral, Rio Yurumangui, Dept. Valle del Cauca, March 25, 1943 (Santiago Renjifo Salcedo Collector); holo- type and 1 paratype at M.C.Z. (No. 2 7435). Chrysops weberi, new species (Figs. 7-8) Female. -Small, related to C. latitibialis Krober and C. renjifoi.
Frons about as wide as high, mostly yellow pollinose and with a few erect black hairs; ocellar area very little raised, exten- sively denuded, but not extended downward, shiny black with yellowish-brown occipital edge; frontal callus large, strongly swollen, yellowish-brown, barely separated from the eyes. Fronto-clypeus shiny honey-yellow, except for the grey pol- hose narrow inner orbits and upper half of cheeks; facial pits yellow ; upper lateral areas (above the pits) flattened convex, not conical.
Antennae yellowish-brown, paler on segment 1; terminal annuli of segment 3 somewhat more infuscated; very slender, much longer than fore femora; segment 1 scarcely longer than 2; 3 about one and one-half times the length of 1, its basal portion very little swollen, but decidedly thicker than 1; 1 and 2 cylindrical, not swollen, about equally thick both from above and in profile. Palpi yellowish-brown. Thorax black; dorsum with a median pair of broad, continuous, yellow pollinose spots between scutellum and wing and on antealar callosity. Scutellum black, broadly dirty-yellowish along hind and lateral margins. Pleura with a number of disconnected yel- low pollinose spots, not definitely forming stripes. Legs: coxae and tibiae strongly infuscated to blackish; femora and tarsi dirty-yellowish to brownish-yellow, the hind tarsi paler ; all tibiae flattened and moderately widened. Wings marked almost exactly as in C. renjifoi, the differences being too slight to jus- tify a figure; the clearer, subhyaline spot near the hind margin of the cross-band is restricted to the middle of the 5th posterior cell; anal cell mostly hyaline. Halteres yellowish-brown. Ab- domeri: 1st tergite yellowish with a black apical margin; 2d



================================================================================

10 Psyche [March- June
narrowly yellowish at base, but more broadly at the sides; re- mainder of tergites shiny black, with three longitudinal yellow- ish stripes, the median one broadest on the 2d tergite where it is connected with the yellow base; the lateral ones less distinct, more or less broken up and extending only over tergites 3 to 6; sternites mostly honey-yellow to fuscous. Length (not including antennae), 6 mm.; of wing, 6.5 mm. BRITISH GUIANA: Oronoque River, in latitude 2'42'N.) July 3 1, 1936, a tributary of the New River in the Courantyne River drainage (N. A. Weber Collector) ; holotype at M.C.Z. (No. 2 7436). - COLOMBIA: Mith, Terr. Vaupks, August, 1943 (P. Allen Collector) ; paratype at M.C.Z. (No. 2 743 6a), some- what mutilated (lacking antennal segment 3), but agreeing in every respect with the holotype.
The foregoing two species have most of the structural char- acters (particularly the widened tibise) and the wing pattern of C. latitibialis Krober. These three species may be separated by the subjoined key. I have compared the holotype and only known specimen of latitibialis, from Kamakusa, British Guiana (M.C.Z. No. 2 7437).
Third antennal segment relatively short, scarcely longer than first, its basal portion very slightly widened. Frontal callus black. Mesopleura without spots. Hind femora mostly black. First abdominal tergite pale yellow with a narrow black apical margin; second tergite pale yellow over basal and black over apical half; remaining tergites black, without markings. ................................ C. renjif oi. Third antennal segment markedly longer than first. Frontal callus partly yellowish-brown. Mesopleura with pale pol- linose spots. Hind femora mostly yellowish-brown. .... 2. Third antennal segment about as long as combined first and second, its basal portion markedly swollen (Fig. 9). First and second abdominal tergites each with a narrow yellow- ish base, the yellow of the second somewhat extended backward in the middle; remaining tergites black, with- out markings. .............................................. C. latitibialis. Third antennal segment much shorter than combined first and second, its basal portion scarcely swollen. First ab- dominal tergite pale yellowish with black apical margin; second tergite pale yellowish at base and on sides; re-



================================================================================

New Neotropical Species of Chrysops
11
mainder of tergites black with three yellowish stripes, the median one connected with the base of tergite 2, the lateral ones only on tergites 3 to 6. ................ .. C. weberi. Figs. 1-3, Chrysops zayasi J. Bequaert, female: 1, wing: 2, head in front view; 3, head in profile. - Figs. 4-6, Chrysops renjifoi J. Bequaert, female: 4, wing; 5, head in front view; 6, head in profile. - Figs. 7-8, Chrysops weberi J. Bequaert, female: 7, head in front view; 8, head in profile. - Fig. 9, Chrysops latztibialis Krober, female, holotype, head in profile.



================================================================================

Psyche [March-June
VOL. 53, PLATE I
Bequaert - Chrysops




================================================================================