190 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



31. Genus ROCINELA Leach. 



Body depressed. Abdomen not much narrower than thorax. Eyes 

 present, well developed, and conspicuous. 



First two articles of the peduncle of the first pair of antennae 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 veiy large, evenly curved hook. 

 Four posterior pairs with the propodus short. 



ANALYTICAL KEY TO THE SPECIES OF THE GENUS ROCINELA. 



a. Eyes contiguous Rocinela oculata Harger 



a' '. 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 cornuta 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 insularis Schioedte and Meinert 



e' '. Eyes widely separated. 

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



median groove Rocinela dumerilii (Lucas) 



/'. Head without carinse. 



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



tubercles on head Rocinela cubensls Richardson 



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



No tubercles on head. 

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



Rocinela maculata Schioedte 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) 



i'. Spots wanting on fourth and fifth abdominal segments and base 



of terminal segment. .Rocinela americana Schioedte and Meinert 



d'. 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. 



llorinela propodiaUs Richardson 



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

 nished with spines. 



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

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

 armed with five or six spines. Abdomen broad when compared with 

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

 middle of the third thoracic segment Rocinela laticauda Hansen 



