14 GUIDE TO ORTHOPTERA 



b 2 . Tegmina corneous. . . Ceratinoptera Brunner. 

 a 2 . Tegmina in both sexes abbreviate, corneous, exposing a por- 

 tion (generally a great portion) of the abdomen. 



b 1 . Tegmina articulate ; wings present though minute. 



Temnopteryx Brunner. 



b 2 . Tegmina squamif orm, lateral, not articulate ; wings wanting. 



Loboptera Brunner. 



All of these genera are found in the southern portion of the 

 United States, and only Ischnoptera, Blatta (introduced) and 

 Temnopteryx in the northernmost portions of the country. Thyr- 

 socera, Blatta, Ceratinoptera and Loboptera only occur in single 

 species, so far as is yet known. Ischnoptera (Platamodes Scud- 

 der) is the most prolific in forms. A careful study of our native 

 Blattinae is much to be desired. 



NYCTOBORINAE. 



Represented by only a single species of Nyctobora Burmeister 

 found in southernmost Texas. 



PERIPL ANE TIN AE . 



Four genera of this subfamily occur in the United States, only 

 one other genus occurring in North America south of our 

 boundaries. 



Genera of Periplanetinae. 



a 1 . First joint of hind tarsi shorter than the others together; 

 arolia rather large. 



b 1 . Tegmina abbreviate and apically truncate, or wanting. 



Eurycotis Stal. 

 b 2 . Tegmina as long as but not surpassing the body. 



Pelmatosilpha Dohrn. 



a 2 . First joint of hind tarsi as long as or longer than the others 

 together; arolia small. 



b 1 . Eyes at least as far apart as the antennal scrobes ; tegmina 

 more or less abbreviate, especially in the female. 



Stylopyga Fischer de W. 



