560 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



Lambrus frons-acutis Lockington, Proc. California Acad. Sci., vol. 7, Feb. 



7, 1876 (1877), p. 31 [4] (type-locality, Santa Catalina; type destroyed in 



San Francisco fire); Proc. California Acad. Sci., vol. 7, July 17, 1876 



(1877), p. 78 [16]. 

 Heterocrypta occidentalis Holmes, Occas. Papers California Acad. Sci., vol. 



7, 1900, p. 44. 



Diagnosis. — Branchial ridge very sinuous, terminating at lateral 

 angle of carapace. Two tubercles in front of convex part of ridge. 

 A triangular, depressed area each side of buccal cavity. A raised, 

 oval disk above ischium of cheliped. 



Description. — Carapace broadly triangular; median gastric region 

 narrow, the flattened upper surface bounded by two granulated 

 ridges which converge to a point behind; cardiac region furnished 

 with a three-sided, pyramidal elevation, the edges of which are 

 usually granulated. Posterolateral regions large, crossed by a 

 sinuous, granulated crest, which extends from near the posterior 

 end of the median gastric region to the acute lateral angles of the 

 carapace; in front of the anterior bend of this crest there is a pair 

 of small tubercles. Rostrum triangular, subacute, not deflexed. 

 Antero-lateral margins straight or slightly concave in front, convex 

 near the middle, the posterior portion passing outwards and back- 

 wards, arching over the legs; the teeth on the anterior part are 

 small and irregular, but they become larger posteriorly where they 

 are furnished with secondary denticles. Postero-lateral margins 

 transverse, posterior margin produced beyond them but not over- 

 hanging abdominal segments. Ischium of maxilliped smooth, antero- 

 internal angle produced; merus small, surface concave, a prominent 

 tooth near middle. A long triangular concave area extends from the 

 subhepatic region back to the afferent branchial openings; it in- 

 cludes the exognath and is surrounded by a fringe of hair; outside 

 this area, and above the ischium of the cheliped there is a raised, 

 level, oval area against which the inner surface of the manus plays, 

 when the cheliped is flexed. 



Chelipeds long, trigonal; surface of merus convex, edges sharply 

 granulate to dentate; carpus with three or four granular lines; 

 angles of hand prominent and dentate, surfaces concave. Legs com- 

 pressed, strongly carinated; dactyls narrow, strongly sulcate, and 

 with long corneous tips. (Holmes, amended.) 



Color.— Tips of tubercles white, ridges bearing tubercles light 

 purplish, remainder of carapace mottled with numerous minute 

 spots of white and purplish, giving a pink effect which often closely 

 approaches white. Legs usually a light yellow. (Weymouth.) 



Measurements. — Male (48905), length of carapace 19.4, width of 

 same 32, length of cheliped 56.2 mm. 



