1951] 
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 caudally 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. 
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. 
