256 Mr. R, Shelford's Studies of the Blattidae. 



r. Ocelli present. Tegmina present, rudi- 

 mentary or absent. Abdominal tergites 

 rarely with stigmatic dots. Supra-anal 

 lamina ( $ ) not bilobate. Cerci longer, 

 apex usually acuminate. 

 2. Wings absent or rudimentary. Teg- 

 mina rudimentary or absent. 

 3. Tegmina absent or represented by 

 squamiform lobes. 

 4. Posterior angles of the 5th and 6tli 

 abdominal tergites backwardly 

 produced.* 

 5. Posterior metatarsus short, not 

 spined beneath or with only a 

 few spines ; its pulvillus usu- 

 ally large, and occupying at 

 least half of the joint. 

 6. Lateral margins of pronotum 

 not incrassated. Thoracic 

 tergites more or less smooth 

 and nitid. 

 7. Supra-anal lamina ( $ ) not 

 prodv;ced to form an acute 



spine Platyzosteria, Br. 



7', Supra-anal lamina {^) 

 produced to form an 



acute spine Leptozosteria, Tepp. 



6'. Lateral margins of pronotum 

 incrassated. Thoracic ter- 

 gites punctate or tuber- 



culate Zonioploca, Stal. 



5'. Posterior metatarsus longer, 

 spined beneath, its pulvillus 

 not occupying one half of 



the joint Cutilia, Stal. 



4'. Posterior angles of the 5th and 

 6th abdominal tergites not back- 

 wardly produced, or if produced 

 the abdominal tergites are 

 scabrous, Tegmina entirely 

 absent. 



* Cutilia sedilloti, Bol. ((?), is an exception. 



