577 



1 . Euscelus robustus Claus, 1 879 (Fig. 25 1 ) 



Claus, 1879b: 22; 1887: 43; Spandl, 1927: 251. 



Length of males up to 6 mm. Female not described. 



The head is oval and its length more than the height. The pereon 

 is somewhat bulged and higher than the head. The pleon is somewhat 

 shorter than the pereon. 



The 1st segment of the flagellum of antennae I in males is the largest, 

 the 2nd segment is broader than the 3rd but equal to it in length, and 

 the 4th segment is linear, longer and narrower than the 3rd. The basal 

 segment of antennae II is equal in length to half the 2nd segment, the 

 2nd and 3rd segments are equal, the 4th is slightly shorter than the 3rd, 

 and the 5th half the 3rd in length. 



The 2nd segment of pereopods I is twice longer than wide but its 

 length less than the distal segments together; the 4th segment is distally 

 broadened; the 5th segment has a well-developed process on the posterior 

 distal angle that reaches the base of the claw; the distal process has 



466 



Fig. 251. Euscelus robustus Claus (after Claus, 1887). 



