6 University of Michigan 



fifth segments brown with small white spot at anterio-median 

 margin, last segment white with darker tip ; ventral surface 

 and paired appendages white, except the antennae and the tips 

 of the outer rami of uropoda, which are brown. 



Head with prominent rounded lateral lobes, a well de- 

 \eloped median lobe is notched at the anterior end. Eyes of 

 good size, with about twenty facets. Second antenna reach- 

 ing beyond middle of second thoracic segment, with fourth 

 segment of peduncle longer than third, with second segment of 

 fiagellum thrice the length of first. 



Fig. 3. Lcptotrichus einarginatus. a, second antenna; d, head; 

 p, posterior end of bod}-; u. uropod. 



Thoracic segments subequal in length, with lateral parts 

 broadly expanded. 



The first two abdominal segments have the lateral parts un- 

 developed. The third, fourth, and fifth are broadly expanded 

 laterally and form a continuous line with the margins of the 

 llioracic segments. The last segment of the abdomen is con- 

 cave on its posterio-lateral margins and extends one-third its 

 length beyond the tips of the preceding segment. Basal seg- 

 ment of uropod half the length of the exopod, which is conical : 

 cndopod linear and nearly two-thirds as long as exopod. 



Type Specimens: Cotypes Cat. No. 50866, Museum of Zo- 

 ology, University of ^Michigan ; Dunoon, British Guiana ; July 

 24, 1914; F. ^l. Gaige, collector. The types were taken under 



