152 NORTH AMERICAN BLATTIDAE 



triangularly raised with apex proximad, this portion thickly clothed with hairs, 

 caudal margin of segment rather strongly concave; seventh segment concealed, 

 except narrowly Jaterad; eighth segment with narrow distal portion exposed, distal 

 margin strongly concave. Supra-anal plate transverse, not extending to distal 

 extremity of subgenital plate, lateral margins strongly convergent and rounding into 

 the broadly trans\-erse mesal portion, lateral margins furnished with a well spaced 

 row of minute, chitinous spines. Cerci slender, lateral margins crenate, with eleven 

 and twelve distinct joints, dorsal surface flattened, ventral surface convex. Sub- 

 genital plate weakly produced, asymmetrical; dextral free margin produced oblique, 

 nearly straight but strongly upcurved to just beyond mesal point, there supplied 

 with a minute, stout projection (style), with apex flat and margin slightly pro- 

 duced sinistrad, at the dextral base of which is a sharp, chitinous, curved spine of 

 equal length, sinistrad of this point the margin is sharply and briefly concave, from 

 which springs a projection (style) which is over twice as long but more slender 

 than the dextral style, curved dextrad, with apex tapering and armed meso-distad 

 with two minute, chitinous spines, beyond this the sinistral portion of the free mar- 

 gin is straight, transverse. Limbs and armament of same as given in generic de- 

 scription. 



Allotype. — 9 ;^^' San Jose del Cabo, Lower California. Mexico. 

 [Hebard Collection.] 



Description of Female. — Similar to t\pe in ambisexual characters, differing very 

 decidedly in the following features. Head with eyes distinctly smaller; inter- 

 ocular space very broad, slightly broader than space between antennal sockets. 

 Ocelli weakly defined, with ocellar area not as deep as in male and rounding more 

 evenly into interocellar area. Pronotum with caudal margin very weakly angulato- 

 produced.2*8 Tegmina greatly reduced, subrectangulate, transversely truncate at 

 apex of anal field, with a weak concavity in discoidal field, distal angle on costal 

 margin broadly rounded, distal angle on sutural margin rectangulate and sharply 

 rounded, sutural margins straight and overlapping. Wings shorter than tegmina, 

 greatly atrophied, but with anterior and posterior fields still defined. Supra-anal 

 plate triangularly produced; lateral margins nearly straight, very weakly and 

 broadly concave; apex blunt, but evenly rounded. Subgenital plate convex, very 

 weakly produced, with free margin weakly convex, except at base of cerci, where a 

 very weak, broad concavity is apparent. 



The remaining males and females from Lower California show 

 scarcely any variation in structure from those described. 



-■"■The present species is domiciliary and apparently widely distributed through the 

 North American tropics. 



^^^ This is another case of the caudal margin of the pronotum showing truncation in 

 the sex exhil)iting reduction in the organs of flight. 



