150 BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



rior margin. The pits on frontal and hepatic regions are elongated 

 in a direction parallel with the longitudinal axis of the body. Entire 

 surface, except bottoms of pits, granulate. Margins sUghtly waved 

 but nowhere distinctly toothed. Frontal margin thick, eyes small, 

 firmly embedded in their sockets. Intestinal margin straight. 

 Chelipeds and feet granulate; chelipeds short, with a crest on merus 

 and one on hand. Ambulatories compressed, with a laminiform 

 crest on merus and two similar crests on carpus and propodus; the 

 propodus is broadly expanded below, forming a process against which 

 the short dactylus retracts, thus giving a subcheliform appearance to 

 the extremities. 



Measurements. — Female type, Panama, length of carapace 5, 

 breadth 7.9 mm. 



Range. — Mexico to Ecuador and Galapagos Islands. 



Material examined. — San Jose Island, Gulf of Cahfornia, Mexico; 

 December 10, 1931; S. A. Glassell; 1 female (Glassell coll.). 



Galapagos Islands; Velero III, Hancock Expedition, 1933: Car- 

 tago Bay, Albemarle Island, February 13, 2 females (68261); Darwin 

 Bay, Tower Island, February 22, 1 female (68259). 



UHUAS LIMBATUS Stimpson 



Plate 36, Figures 3-5 



UhUas limbatus Stimpson, Ann. Lye. Nat. Hist. New York, vol. 10, p. 118, 1871. 

 (type locality, St. Thomas; type not extant). — Rathbun, Ann. Inst. Jamaica, 

 vol. 1, p. 38, 1897. 



Diagnosis. — Carpal and propodal articles of ambulatories flattened 

 above, not cristate; extremities not subcheUform. Bottom of pits on 

 carapace granulate. 



Description. — Carapace, chelipeds and legs closely granulate. 

 Carapace moderately convex except toward the sides, which are 

 strongly projecting. Hepatic region Hmited from the branchial 

 region by an inconspicuous closed fissure. Cardiac region surrounded 

 except in front by a deep furrow which posteriorly follows the hind 

 margin of carapace. A deep circular pit on posterior part of branchial 

 region ; swollen part of carapace surrounded on the sides by a shallow 

 concavity which deepens at its posterior extremity on branchisl 

 region. Lateral margins waved but not distinctly toothed. Pos- 

 terior margin sUghtly convex. Merus of cheHped subtrigonal, not 

 lobate; manus very thick, lower margin convex, upper edge thin. 

 Third to fifth segments of male abdomen coalesced, proximal portion 

 of this compound segment with a median sulcus, surface swollen on 

 either side, anterior portion rising in a low median tubercle; penult 

 segment in the shape of a short hourglass; terminal segment trian- 

 gular, longer than broad, reaching a httle into the buccal cavity. 



