608 riWCEEDINGS OF THE NATIONAL MUSEUM. 



It differs from the first uarned in the very large size of the palpus and 

 in the relative leiigtlis of the ambulatory legs; from the second in the 

 transverse, Mattonod carapace, as well as in the larger palpns; from 

 the third in the broader carai)ace and buccal cavity and narrower front. 



130. TETRIAS SCABRIPES, new species. 

 (riateXLllI, ii.uH. 12-11.) 



Carapace setose ; le</s roKfjh with tubercles and spinules. 



Carapace covered with a short, dense coating of coarse, dark setjie, 

 beneath which the surface is punctate; regions indicated by impressed 

 lines and pits, the deepest that between the cardiac and gastric regions; 

 outer margin of hepatic region bearing a tubercle. Front projecting 

 very slightly beyond the anterior margin of the carapace, and bent 

 down to form the roof of the antennular cavities, as in Pinnu-a. 

 Abdomen of female fringed with long hair. Maxilli{)eds bearded with 

 long silken hairs, most noticeable on the margins of the last two palpar 

 joints, and in a transverse line on the merus. 



The outer surface of the merus of the chelii)eds is triangular and as 

 broad as long; its upper and lower margins are rougli with small spines 

 or sjunules. The inner angles of the carpus are rectangular; each 

 angle is aiMiunl with two or three short spines. Palms broad, with con- 

 vex subacute uuirgins, and covered with sharp tubercles arranged in 

 longitudinal lines. These tubercles extend to the tips of the fingers, 

 which are finely dentate along their prehensile edges and fit closely 

 together. The meri of the ambulatory legs are narrow, with subparallel 

 nuirgins. The first ambulatory leg reaches to the end of the propodus 

 of the second i)air; its merus has tlie inferior margin denticulate, the 

 superior margin with three spinules at its i)roximal end; the carpus 

 and pro[)odus short and broad; the dactylus stout and half as long as 

 the i»ropo<lus. The second or longest and)ulatory is a little longer 

 than the width of the (carapace; its merus has a spinule at the proximal 

 end of the ui)i)er margin, and the lower margin is somewhat roughened; 

 the carpus aiul ])ropodus are proportionally narrower than in the first 

 leg. The tliird ambulatory readies about the middle of the propodus 

 of the second, and the joints resemble those of the second pair, but are 

 unarmed. The last leg is much reduced, and reaches a little beyond 

 the middle of the merus of the j^receding pair; the joints are propor- 

 tionally rather broad; the lower nuirgin of the ischium and merus is 

 armed with spines and spinules; tlactylus very small. The legs are 

 covered with seta; like those on the carapace, and fringed with hair. 



IHmensions. — Female: Length, G mm.; anterior width, 9.2 mm. ; great- 

 est width, 0.2 nun. 



Tifpe. — No. 21505, IT.S.N.M. One egg-bearing female, southern part 

 of tJulf of California, 0.^ fathoms, station 282G. 



