1 6 NORTH AMERICAN BLATTIDAE 



EE. Wings with an appendicular field. Dorsal surface of abdomen with 

 sixth segment specialized mesad. Supra-anal plate not bilobate. Fourth 

 tarsal joint alone supplied with a pulvillus. Ocellar spots absent. Gen- 

 eral coloration ochraceous-buff with a tawny tinge. (Ventral margins 

 of femora, excepting caudal margin of cephalic femora, each supplied 

 with a single, elongate, distal spine. Large arolia present.) 

 F. Tarsal claws simple. Pronotum nearly deplanate. Subgenital 

 plate with styles inset mesad and produced in elongate and attingent 

 scutes. Appendicular field large, slightly wider than long. Size small. 

 Chorisoneura texensis Saussure and Zehntner 

 FF. Tarsal claws specialized, showing on each internal margin two 

 microscopic teeth. Dorsal surface convex, suggesting certain forms 

 of Coleoptera. Subgenital plate with slender, cylindrical styles inset 

 along lateral borders of a subquadrate mesal emargination, the base 

 of which is triangularly produced. Appendicular field very large, 

 much longer than wide. Size very small. 



Plectoptera floridana new species 

 DD. Anal field of wings not folding. Surface of insect hairy. 



E. Ocelli present (with surfaces convex). Subgenital plate somewhat 

 asymmetrical. 

 F. Ocelli minute. Ocellar areas not defined. Tegmina opaque, hairy, 

 with ^'eins very weakly defined proximad ; membranous, clear trans- 

 parent distad. Ventro-cephalic margin of cephalic femora supplied 

 with a row of minute, chaetiform spines, terminated by two heavy, 

 elongate, distal spines; other ventral femoral margins unarmed. Four 

 proximal tarsal joints each bearing a pulvillus. Moderately well 

 developed arolia present. Size very small. Styles minute, elongate, 

 the sinistral the longer. (Head, underparts and limbs blackish. An- 

 tennae each with a pale distal annulus. Pronotum and proximal por- 

 tion of tegmina black, with a weak, metallic, green-blue sheen.) 



Holocompsa nitidula (Fabricius) 

 FF. Ocelli large. Ocellar areas strikingly defined. Tegmina delicate 

 in structure with veins distinct. Ventral femoral margins unarmed. 

 Pulvilli absent. Arolia absent. Size large to medium small. Stj'les 

 absent. (Concealed genitalia complex.) 

 G. Median and caudal femora with a disto-dorsal genicular spine. 

 Ventral margins of femora supplied with numerous stift' hairs. Supra- 

 anal plate produced, delicate in structure, weakly bilobate. Genital 

 hook curved inward. Subgenital plate with surface unspecialized. 



Arenivaga^s 



1* A key to the males of the North American species of the Polyphaginae is given on 

 page 217. The four species of Arenivaga, found north of the Mexican boundary, are there 

 tabulated. 



