I8OPOD8 OF NORTH AMERICA. 153 



The clypeus is very narrow, very manifest when seen from below; 

 the labrum is partly concealed by the mandibles. 



The first and second pair of antennae are as in E. fissicauda. 



The mandibles in the male are more prominent than in the female. 



The maxillipeds are furnished below with numerous little knots, for 

 the most part acute. 



The first two or three segments of the thorax have rather distinct 

 postmarginal furrows; the furrows on the posterior segments in the 

 male are quite distinct, in the female they are obscured more or less 

 by hairs. 



The epimera and the legs are almost as in E. antillensis. 



The five anterior segments of the abdomen are formed almost as in 

 E. antillensis. The last segment of the abdomen is almost as in E. 

 antillensis, but differs from that species especially in having the 

 median excavation at the base shorter, the lateral tubercles rather 

 narrower, the apex furnished with five spines, and subacute, the 

 lateral margin not incised in the middle, and the dorsal surface fur- 

 nished with two thickly setose areas. 



The uropoda extend somewhat be} 7 ond the abdomen; the inner 

 branch extends a little beyond the outer branch, is almost twice as 

 long as wide, and has the inner posterior margin rather curved, fur- 

 nished with spines and long hairs, the apex a little produced and acute. 

 The peduncle has the inner angle somewhat exceeding a third part of 

 the inner branch. 



The color is a brownish yellow. The male appendix is almost as in 

 E. tricornis. a 



The above description is adapted from the following one of Hansen's: 



Diagn. Cor. fixsicaudw valde similis, eegmento ultimo caudse fere ut in C. antil- 

 lensi formato, longiore, apice subacuto, margine lateral! in medio non inciso, dorso 

 areis duabaa spisse setosis instructo, imprimis ab ea specie diversa. Long, maris 

 9, 7 mm., long, feminse 11, 5 mm. 



Corpus circiter triplo longius quam latius; segmenta 4 posteriora trunci imprimis 

 ad marginem posteriorem versus et segmenta 2-5 caudse in mare fere nuda, in femina 

 scabra, setis brevissimis, rigidis instructa; truncus in mare paulo longior et in femina 

 nonnihil longior quam cauda. 



Frons ut in specie prsecedente ( C. fissicauda). 



Oculi fere ut in specie prsecedente, in mare nonnihil majores et plus convexi 

 quam in femina; ocelli permagni in mare valde convexi, in femina paulo minus 

 convexi. 



Lamina frontalis ut in Cor. fissicauda. 



Clypeus perangustus, supinus visus perspicuus; labrum ex parte a mandibulis 

 tectum. 



Antennulae et antennae ut in Cor. fissicauda. 



Mandibulse in mare plus prominentes quam in femina. 



Maxillipedes subtus nodulis compluribus ex parte acutis armati. 



Segmenta duo vel tria anteriora trunci stria postmarginali paulum distincta; 



