258 BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



denticulate lobes; posterolateral margin single, tuberculate; posterior 

 margin narrow, concave; at the widest part of the carapace a short 

 row of tubercles near and parallel to the margin. Manus sparingly 

 tuberculate, the tubercles largest above; superior border a slight, 

 denticulate crest spht into three indistinct lobes. Edges of ambulatory 

 legs sHghtly cristate. 



Color. — Traces of transverse red bands on ambulatories of preserved 

 specimen. 



Measurements. — Male holotype, length of carapace 24.5, width 

 32 mm. 



rJ-n 



Figure iS.—Osachila lata, male: Anterior part from below. After Faxon. 



Range. — West coast of Mexico. 



Material examined. — As follows: 



Off Tres Marias Islands; lat. 21° 22' 15" N., long. 106° 25' 00" W.; 

 80 fathoms; rky.; temp. 51.2° F.; Apr. 18, 1891 ; station 3427, Albatross; 

 1 cf holotype (4497, M. C. Z.). 



Chamela or Perula Bay; lat. 19° 32' 00", long. 105° 08' 00" W.; 

 30 fathoms; S.; July 19, 1932, station T.3.R., Zaca; Crocker Expedi- 

 tion; 1 male (Calif. Acad. Sci.). 



Subtribe HAPALOCARCINIDEA VerrilP^ 



Hapalocarcinidea Verrill, Trans. Connecticut Acad. Arts and Sci., vol. 13, p. 

 426, 1908. 



Epistome feebly developed ; buccal area large and arched anteriorly. 

 Lower border of orbit little developed. Outer antennae small and 

 extraorbital. Antennules with a large, prominent basal article. 

 Carapace narrow and more or less oblong, or semicyhndrical, not 

 much narrowed anteriorly. Front usually subtruncate or emarginate 

 without a central tooth. Outer maxilhpeds separated at base by a 

 sternal lobe; ischium broad, often with a convex inner lobe; merus 

 small, seated well back, with the palp articulating in a notch of inner 

 edge; exognath small. Chelipeds feeble, often little if any larger than 

 the next legs; chelae simple, with acute tips. Ambulatory legs similar, 

 short, with short, sharp, hooked claws, for strong adhesion; the posterior 

 ones not articulated much higher up than the others. (VerrUl.) 



" This subtribe ranks among the Brachyura although of doubtful position therein. It is placed in this 

 volume to complete the series of marine brachyurans of America. 



