MORGAN HEBARD II 



western area, including the higher portions of the Great Plains, the 

 Rocky Mountain system and the Great Basin.. Only in the very 

 limited tropical areas along the southern border of the United States, 

 extreme southern Florida and the Florida Keys, the Brownsville 

 region of Texas and several even smaller areas along the Mexican 

 line in New ^lexico and Arizona, are the species numerous and 

 present in large numbers. 



The Pseudomopinae are represented by twenty-four species, all 

 of the other subfamilies by a total of nineteen; totaling fort}- 

 three established species and one geographic race, of which ten 

 species are probably established adventives. Of the total, four- 

 teen are found only in the tropical portions of the United States 

 six of these being established adventive species. 



Key to the Males of the Blattidae found in North America, north of 



of Mexico^- 



A. Ventral margin of femora supplied with numerous spines. (Median and caudal 

 femora with a disto-dorsal genicular spine. Tegmina present. Tarsal claws 

 simple.) 

 B. Ventro-cephalic margin of cephalic femora armed with a row of heavv proxi- 

 mal spines, succeeded by a row of more slender, shorter, distal spines (t}pe B). 

 (Arolia present.) 

 C. Fourth tarsal joint alone bearing a pulvillus. Tegmina with oblique dis- 

 coidal sectors, where these are not obliterated by tegminal reduction. 

 D. Dorsal surface of abdomen not specialized. Pronotum distincti\ely 

 and strikingly marked. X'entro-cephalic margin of cephalic femora with 

 two hea\-y, elongate, distal spines. (Size small.) 

 E. Tegmina fully developed, extending beyond apex of abdomen. Con- 

 cealed genitalia unusually highly specialized. Subgenital plate with 

 two very small, rounded styles, slightly longer than wide. Pronotum 

 shining blackish brown, margined laterad and cephalad with bulT>-, which 

 band, at the latero-caudal angles, crosses the pronotum before the caudal 

 margin, in this transverse portion being broader than elsewhere. 



Euthlastoblatta abortiva (Caudell) 

 EE. Tegmina considerably reduced, truncate, leaxing distal portion of 

 abdomen exposed. Concealed genitalia not highly specialized. Sub- 

 genital plate with \-ery broad, short styles, in large part fused with the 

 distal margin. General coloration buffy, beautifulh- marbled and marked 



" The species of the genera Parcoblatta and Arenivaga are not included in the present 

 key. Keys to distinguish the males of these species are given under iheir respective 

 generic discussions. 



MEM. .\M. EXT. SOC, 2. 



