206 NORTH AMERICAN BLATTIDAE 



Generic Description. — Head orbicular; eyes widely separated; 

 ocelli very minute but with surfaces convex; area from between 

 ocelli to clypeal suture smooth, bullate, with a faint, percurrent, 

 dorso-ventral median sulcus. Pronotum heavily supplied with 

 hairs; convex, narrow lateral portions strongly declivent; cephalic 

 and caudal margins truncate, the latter much the broader. Teg- 

 mina divided obliquely into two portions, the proximo-lateral por- 

 tions opaque and hairy, the remaining portions membranous; 

 veins of tegmina very weakly defined; distal portion of the anal 

 sulcus conspicuous, nearly transverse. Wings equal in length to 

 tegmina, greater portion of the venation subobsolete; discoidal 

 vein enlarged in a very elongate costal thickening, median vein 

 delicate, arcuate, terminating in an ovoid thickening, these two 

 thickened areas opaque and adjacent; the proximal portions of the 

 mediastine, ulnar and anal veins are linear and corneous, then 

 suddenly atrophied. Dorsal surface of male abdomen unspecialized ; 

 supra-anal plate, in both sexes, convex to sub-bilobate. Subgeni- 

 tal plate of female convex, strongly so meso-distad, where a val- 

 vular development takes place, with basal sutures of vaJves straight, 

 convergent, from the distal margin of the plate to their acute- 

 angulate juncture. Cerci with joints very distinct in both sexes. 

 Limbs short and rather stout. Cephalic femora with ventro- 

 cephalic margins supplied with a row of minute, chaetiform spines, 

 terminated by two heavy, elongate, distal spines, of which the 

 last is much the longer; other ventral femoral margins unarmed. 

 Median and caudal femora each supplied with a very elongate genic- 

 ular spine. Tarsi relatively small ; pulvilli appreciable distad on 

 first and second tarsal joints, completely filling brief ventral sur- 

 face of succeeding third and fourth joints. Arolia present, moder- 

 ately well developed. 



Holocompsa nitidula (Fabricius) (Plate VIII, tigures 8 to ii.) 

 1781. B[hitta] nitidula Fabricius, Spec. Ins., i, p. 345. [[9, from description] 

 Surinam.] 



Burmeister's cyanea and collaris have been shown to represent 

 the male and female respectively of this species, ^''^ the sexes of which 

 are very dissimilar. 



33- Rehn and Hehard, Proc. Acad. Nat. Sci. Phila., 1914, p. 381, (1914). 



