72 



U.S. NATIONAL MUSEUM BULLETIN 2 59 



more spinose 2nd uropod in both sexes; specifically distinguished from 

 S. tenuis, with which it is S3rmpatric, by less concave palmar margins 

 of gnathopodal propods and by the proportinately shorter 2nd antenna 

 of mature males. Further distinguished from the majority of species 

 of the tenuis group by the greater number of apical spines on the telson 

 of the male. Largest males, 9.75 mm; largest females, 10.00 mm. 



Figure 17. — Stygonedes hayi (Hubricht and Mackin). Male syntype (9.75 mm), Zoological 

 Park, Washington, D.C.: a,b, antennae 1,2; c, coxal plate of pereopod 3; d-f, pereopods 

 4,5,7; g, telson; h, abdominal side plates 1,3; t, uropod 3;;,^, gnathopods 1,2. Female 

 syntype (8.75 mm), same locality: l,m, antennae 1,2; n, pereopod 4. 



