MARINE AMPHIPODA IN MICRONESIA — BARNARD 503 



76-H-3 (1), 83-E-l (3), 84-D-l (2), 85-F-3 (2), 95-D-4 (2), 95-1^4 

 (1), 125-D-3 (1), 128-C-5 (2), 130-C-2 (4), 132-E-4 (1), 139-C-2 (7), 

 141-D-3 (1), 142-E-4 (6), 146-151-H-4 (2), 155-157-G-l (5), 158- 

 159-D-5 (1); Hand station CH-682 (1); Bayer station 756 (1); Reish 

 stations E-2 (1), E-18 (8), E-24 (3), E-26 (2), E-27 (1), E-38 (1), 

 E-40 (1), E-43 (1), E-44 (2), ME-56 (1), ME-57 (2), E-68 (1), E-75 

 (0), E-78 (5), E-86 (1), E-93 (15), E-96 (1), BE-100 (3), BE-102 (5), 

 BE-103 (6), BE-104 (4), BE-107 (4), BE-109 (1), BE-111 (38), E-119 

 (3), E-127 (4), E-129 (5), E-136 (3), E-137 (8), E-140 (1), E-142 (1), 

 E-184 (5). 



Remarks: This species is most variable and it has been difficult to 

 resolve the impression that not all of the material so listed belongs to 

 this species. The third pleonal epimeron in well-developed males takes 

 the shape of figm'e 12 A, with a straight hindedge and small, nearly 

 uptm-ned tooth at the lower corner. Younger males, still with the 

 correct gnathopodal configuration may have the lower corner rounded- 

 quadrate, with or without a notch at the lower corner as figured by 

 Schellenberg (1938a). Females and juveniles generally have a 

 rounded or notched lower corner. Females are indistinguishable from 

 Elasmopus minimus Chevreux (1908) and Phlot (1936) but all males, 

 where associated with the females, have the gnathopods of E. pseudaf- 

 Unis. No E. minimus males have been found in the collections. 



The notches of the thu'd pleonal epimeron often have a small sharp 

 tooth enclosed. 



Some of the females actually may be young E. rapax, but only one 

 recognizable male of that species has been found in the collections from 

 the USNM. Except in large specimens, the teeth on the hindedges of 

 the second articles of pereopods 3-5 are small and relatively even. 



Distribution: Gilbert Islands; Kapingamarangi Atoll; Ifaluk Atoll, 

 Caroline Islands; Eniwetok Atoll, Majuro AtoU, Bikini Atoll, Mai'shall 

 Islands. 



Elasmopus rapax Costa 



Figure 14 

 Elasmopus rapax Costa. — J. L. Barnard, 1955, pp. 10-12, fig. 5. 



Material: Abbott station 42-F-2 (2). 



Remarks : The male at hand is more typical of the classic figures of 

 this species (Sars, 1895, pi. 183) than the material reported by J. L. 

 Barnard (1955) from the Hawaiian Islands. The large outer palmar 

 tooth seen on the Hawaiian specimens is absent. 



Distribution : CosmopoUtan tropical-temperate. 



