190 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



31. Genus ROCINELA Leach. 



Body depressed. Abdomen not much niirrower than thorax. Eyes 

 present, well developed, and conspicuous. 



First two articles of the peduncle of the first pair of antenna? not 

 expanded. Frontal lamina small and narrow. 



Mandibles with a linguiform lamella (molar expansion?). Palp of 

 the maxillipeds composed of two articles. 



First three pairs of legs with propodus more or less expanded and 

 armed with spines; dactylus forming- a very large, evenly curved hook. 

 Four posterior pairs with the propodus short. 



ANALYTICAL KEY TO THE SPECIES OF THE (iENUS ROCINELA. 



fl. Eyes contiguous Rochiela oculata Harger 



(/. Eyes not contiguous. 



b. Flagellum of second pair of antennae composed of from fourteen to sixteen 

 articles. 

 c. First thoracic segment with antero-lateral angles produced horn-like at sides 



of head Rocinela cornuia Richardson 



c'. First thoracic segment with antero-lateral angles not produced horn-like at 

 sides of head. 

 d. Propodus of prehensile legs armed with from two to four spines. 



e. Eyes very close together Rocinela insulans Schifcdte and INIeinert 



e^. Eyes widely separated. 

 /. Head bicarinated, the two carinsc being separated by a longitudinal 



median groove Rocinela dumerilii (Lucas) 



Z'. Head without carinje. 



(/. Front of head produced in a widely rounded spatulate process. Two 



tubercles on head Rocinela, cubensi^ Richardson 



g^. Front of head not produced in a widely rounded spatulate process. 

 No tubercles on head. 

 //. Spots present on both sides of the fourth thoracic segment. 



Rocinela maculata Schi(cdte and Meinert 

 //. Spots wanting on both sides of the fourth thoracic segment. 

 i. Spots present on fourth and fifth abdominal segments and base of 



terminal segment Rocinela belliceps (Stimpson) 



(■'. Spots wanting on fourth and fifth abdominal segments and base 



of terminal segment. .Rocinela arnericana, Schioedte and Meinert 



(F. Propodus of prehensile legs armed with from four to six spines or with as 



many teeth. 



e. Propodus of prehensile legs armed with a process the edge of which is 



furnished with six teeth, meeting squarely and without interval. 



Rocinela propodialis Richardson 

 e^. Propodus of prehensile legs not armed with denticulate process, but fur- 

 nished with spines. 

 /. Abdomen much longer than wide. Outer liranch of uropoda one and 

 a half times wider than inner branch. Propodus of iirehensile legs 

 armed with live or six spines. Al)domen broad when compared with 

 thorax, last segment widely rounded. Second anteniue extend to the 

 middle of the third thoracic segment Rocinela laticauda Hansen 



