R. V. Chamberlin.
A New Species in the Chilopod Genus Theatops.
Psyche 58(3):100-101, 1951.

This article at Hindawi Publishing: https://doi.org/10.1155/1951/43725
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A NEW SPECIES IN THE CHILOPOD GENUS
THEATOPS
BY RALPH V. CHAMBERLIN
University of Utah
The finding of a new species of Theatops, making the fourth well defined species known in the genus, is of con- siderable interest. The type of the new form was taken in a cave in Sonora, Texas, and may be a definitely cavern- icolous species. The four species of the genus may be distinguished by means of the following key. Key to Species of Theatops
1
(3) Prefemur of anal legs with no spine at mesodorsal corner .................................. 2 Prefemur and femur of anal legs entirely lacking spines or teeth; coxopleurae not mesally elevated, with no spine; tibiae 1 to 9 with a single ventral spine. ......................... postica (Say) Prefemur and femur of anal legs each with one ventral spine; coxopleurae with inner border ele- vated and bearing caudally a spine or tooth; at least some of the tibiae 1 to 9 bearing a second spine. .................. ervthrocephala (Koch) 3
(1) Prefemur of anal legs with a distinct distal spine at mesodorsal corner ....................... .4 4 Last tergite with no median longitudinal sulcus; antennae and articles of normal length. ........ . . . . . . . . . . . . . . . . . . spinicauda (H. C. Wood) Last tergite with a sharply impressed median long- itudinal sulcus; antennae and its articles long and slender ................... phanus, n. sp.



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19511 Chamberlin - Chilopod Genus Theatops 101 Theatops phanus, n. sp.
Color pale yellow. Head smooth, without sulci; overlapp- ing the first tergite. Antennae exceptionally long, reaching back to the sixth segment. First tergite with the transverse sulcus forming an obtuse angle at the middle, this sulcus crossed by a longitudinal median sulcus which furcates posteriorly. Dental plates of prosternum elongate, narrow- ing distad; the distal margin oblique, smooth or with an obscure nodule at outer and inner ends. Second to twentieth tergites bisulcate. The last tergite elongate as usual; with a sharply impressed median longitudinal sulcus. Sternites smooth, with no definite longitudinal sulcus but on most a median depression or shallow pit. Last sternite long and slender, narrowing caudad, the posterior corners rounded. Coxopleurae eaudally truncate, with a small spinous point at inner corner which is slightly produced dorsocaudad; poriferous area ending caudally nearly on a level with the end of the sternite. Prefemur of anal legs with a well developed spine at the dorsocaudal corner as in spinicauda, otherwise without true spines or teeth, but with the meso- dorsal and mesoventral margins compressed into a sharp edge bearing a few well separated denticles, not closely finely serrate as in spinicauda. Femur with two compressed ridges as in the prefemur. Terminal claw obviously more slender than in spinicauda.
Length : 42 mm. Length of antennae, 14 mm. A Locality: Texas : Sonora, in a cave on Stevenson's Ranch. One specimen found beneath stone on bottom of first drop in the vertical cave. Collected by G. G. Stevenson on April 16, 1926.




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