OXYSTOMATOUS AND ALLIED CRABS OF AMERICA I49 



segments 3 and 4; a conical, sharp, downward-pointing spine at 

 proximal end of segment G. 



Measurements.- — Male (66515), length of carapace 17, width of 

 same 16 mm. 



Female. — A small specimen (69750) 6.7 mm long by 6.3 wide, is 

 probably the 3"oimg female of ^S*. digueti. The striking protuberances 

 of the male are replaced by slight ones; the median cardiac lobe is 

 low, as is also the marginal lobe beneath it, which has a slight groove. 

 The front is relatively shorter and less constricted than in the male. 



Range. — West coast of Mexico to Panama. 



Material emmined. — As follows: 



Mexico: Carmen Island, Gulf of California; 20 fathoms; December 

 19, 1931; 1 male; S. A. Glassell collector and owner. Acapulco; 

 April 1930; H. N. Lowe; 1 male (66515). 



Panama: Secas Islands; south and west of group; 25 fathoms; 

 nullipores; February 22, 1934; Hancock Galapagos Exj^edition; 

 station 251; 1 female young (69750). 



Genus UHLIAS Stimpson 



Uhlias Stimpson, Ann. Lye. Nat. Hist. New York, vol. 10, p. 117, 1871 (type, U. 

 ellipticus Stimpson) . 



Carapace broadly elliptical, sides much expanded, depressed, 

 laminiform, middle elevated; front nonprojecting; eyes concealed 

 beneath orbital margin of carapace. Exognath of outer maxillipeds 

 not tapering. Propodi of ambulatory legs expanded, dactyli short. 

 East and west coasts of middle America. 



KEY TO THE SPECIES OF THE GENUS UHLIAS 



A>. Ambulatory legs subcheliform ellipticus (p. 149) 



A2. Ambulatory legs not subcheliform limbatus (p. 150) 



UHLIAS ELLIPTICUS Stimpson 



Plate 3G, Figures 1, 2 



Uhlias ellipticus Stimpson, Ann. Lye. Nat. Hist. New York, vol. 10, p. 117, 1871 

 (type locality, Panama; type not extant). 



Diagnosis. — Carpal and propodal articles of ambulatories cristate, 

 the latter forming a process below against which the dactylus closes, 

 giving a subcheliform appearance. Bottom of pits on carapace not 

 granulate. 



Description. — Upper surface of carapace, with the exception of the 

 central parts and the lateral expansions, covered with deep, rounded, 

 or elongated pits. The posterior pits are the largest, and six of them, 

 of a pentagonal or rounded shape, are situated on the posterior part 

 of the branchial regions, three on each side. A large transverse pit 

 occupies the entire width of the intestinal region, following the poste- 



