Charles D. Michener.
A Review of the American Bees of the Genus Macropis (Hymen., Apoidea).
Psyche 45(2-3):133-135, 1938.

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Genus Macropis
A REVIEW OF THE AMERICAN BEES OF THE GENUS MACROPIS (HYMEN., APOIDEA)
By CHARLES D. MICHENER
University of California, Berkeley, Calif. Since the genus Macropis has not previously been re- corded in America west of eastern Colorado, it is of interest to find M. morcei, the most widely distributed of our species, in Montana, and a new form of M. steironematis in Washing- ton State, an extension of the known range of the genus by well over one thousand miles.
A comparison of our species with the descriptions and figures of Old World forms shows that the North American species belong to Macropis s.str., not to the subgenus Para- macropisl. Indeed the genitalia and sternites of our species agree in all essential points with the figures of M. labiata given by Saunders2. There are, however, certain differences, both in the genitalia and in the sternites. In M. morcei and diata the lateral projections of the eighth sternite, slender in labiata, are mere angles, while in M. steironematis opaca, described below, they are broad, rather truncated anteriorly, and about as long as in labiata. In M. morcei the genitalia are very similar to those of M. ciliata but differ in the some- what shorter outer ramus of the stylus. I have not been able to study the genitalia of M. patellata or typical M. steirone- matis.
If M. longilinguis Provancher3, described from the female, proves to be true Macropis, it is probably a synonym of ciliata or patellata. Scrapter andrenoides Smith4, which was re- ferred to Macropis by Dalle Torre is placed in Pseudopanur- gzis by Cockerel15.
1Popov and Guiglia, 1936, Ann. Mus. Civ. Storia Nat. Genova, 59:287. Popov, 1936, Proc. Royal Ent. Soc. London (B) 5:78. launders, 1882, Trans. Ent. Soc. London, pi. 10. sprovancher, 1888, Add. Faun. Ent. Can. Hym., p. 424. 4Smith, 1863, Cat. Hym. Brit. Mus., 1:lZ.l. Wockerell, 1904, Can. Ent., 36:303.




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134 Psyche [ June-Sept.
Macropis steironematis opaca Michener n. subsp. Male:
Similar to M. steironematis but hind metatarsus dull, very minutely roughened on outer side; punctures of hind tibiae smaller than in M. steironematis, the surface between them minutely roughened; punctures of vertex more numerous, leaving only very small impunctate regions ; surface between punctures of vertex slightly roughened. Length 9 mm.
Holotype :
Morgan's Ferry, Yakima River, Washington, July 1, 1882, in the collection of the Museum of Comparative Zoology at Cambridge, Massachusetts.
Differs from the typical form of this species by the much duller surface of the legs and vertex.
Macropis morcei Robertson
Two specimens from Montana (no further data) are from the collection of the Academy of Natural Sciences of Phila- delphia.
Fig. 1. 1, Dorsal view of genitalia of Macropis ciliata Patton; 2, Lateral view of genitalia of Macropis ciliata Patton; 3, Lateral view of genitalia of Macropis steironematis opaca Michener. The following key will separate the American species of the genus :
1. Entire body closely punctured; length about 9 mm. Male: Middle metatarsus broad, wider near base, and taper- ing apically; supraclypeal area yellow, and lateral face



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19381 Genus Macro pis 135
marks extending above antennal sockets ; hind tibial spurs not inserted beneath teeth. ............................. 2 -.Body much more sparsely punctate, punctures of abdomen separated by five or more times their diameters; length about 7 mm. Male: Middle metatarsus slender, parallel sided; lateral face marks not extending above antennal sockets. .............................................. 3 2. Male: Outer surface of hind metatarsus polished be- tween the hairs; punctures of hind tibiae larger, the surface between them smooth; vertex shiny, with some fairly large, almost impunctate, smooth, areas.
(East of Rocky Moun-
....................................
tains) steironematis6
-.Male: Outer surface of hind metatarsus dull, minutely roughened; vertex less shiny, with more punctures, the sur- face between them slightly roughened. Female: Unknown. (Washington State). ................. steironematis opaca 3.
Male: Hind tibial spurs not arising from beneath teeth; supraclypeal area black or with little yellow; lateral face marks reduced to short lines near sides of clypeus. Female: Pubescence of hind metatarsus largely black on outer side. morcep
-.Male: One or both hind tibial spurs arising beneath a tooth ; supraclypeal area yellow ; lateral face marks occupy- ing entire space between clypeus and eye margin to a point above upper margin of clypeus. Female: Pubescence of hind metatarsus white. ................................ 4 4. Male: Outer hind tibial spur only arising beneath a tooth; lateral face marks ending about opposite middle of antennal sockets. Female: "Punctation, especially of scutel, spar~e."~ .................................. ciliatag -.Male: Each hind tibial spur arising beneath a tooth; lateral face marks truncated and ending below the level of antennal sockets. Female: "Punctation, especially of scutel, den~e."~ ............................... patellata10 fiRobertson, 1891, Trans. Am. Ent. Soc., 18:63. '^Robertson, 1897, Trans. Acad. Sci. St. Louis, 7:338. Wiereck, 1916, Hym. Connecticut, p. 720. spatton, 1880, Ent. Mon. Mag., 17:31.
lopatton, 1880, Ent. Mon. Mag., 17:33.




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