1923] 



Rathbun, Brachyuran Crabs of West Coast of Mexico 



627 



Pinnotheres pichilinquei, new species 

 Plate XXX; Text Figures 3 to 5 



Type-locality. — Pichilinque Bay, Lower California; by electric light; March 

 27; 4 males. 



Type.— Cat. No. 57004, U. S. N. M. 



Measurements. — Length of carapace of type male 4.4 mm., width 4.3 mm. 



Diagnosis of Male. — Pubescent. Carapace deeply sculptured. Chelipeds 

 very heavy. Legs subequal. 



Description of Male. — Carapace subhexagonal, the postero-lateral regions 

 deeply hollowed, the posterior ambulatory leg fitting into the hollow; surface cov- 

 ered with a dense soft pubescence which forms a smooth, as opposed to a ragged, 

 surface, but does not conceal the inequalities of the shell. Cardiac region surrounded 

 by a deep groove except posteriorly; branchial and gastric regions grooved in such a 



Fig. 3. Pinnotheres pichilinquei, left outer maxilliped of c? paratype, X 33%- 

 Fig. 4. Pinnotheres pichilinquei, right first ambulatory leg of cf paratype, X 27. 

 The outer line marks the extent of the fringe of hair. 



Fig. 5. Pinnotheres pichilinquei, abdomen of d 1 paratype, X 27. 



way as to form a regular pattern; hepatic region depressed. Front viewed from above, 

 advanced, broadly subtriangular, edge arcuate; viewed from before, the front is 

 deflexed and pointed. Orbits round, eyestalks stout, cornea? smaller but of good size 

 and black. Antennules when folded bulging; antenna 1 as long as one-half width of 

 front. 



Chelipeds pubescent like the carapace and with a dense short fringe on the inner 

 border; they are stout; carpus somewhat nodose, chela thick and high; palm with 

 upper surface concave, outer surface with two longitudinal grooves; lower margin 

 of propodus convex from one end to the other; fingers heavy, meeting when closed, 

 tips slender and crossing; a small tooth near base of each finger. 



Ambulatory legs similar, diminishing slightly from first to fourth pair; carpus- 

 propodus broader than merus, and having a fringe of long hairs attached on the pos- 

 terior surface just below the upper margin, the hairs lying against the surface; 

 dactyli slender, long, curved. 



