182 Notes on North American Crustacea. 



antennae is slender, and reaches considerably beyond the praeorbital 

 tooth. The abdomen in the female shows a deep, vermiculated furrow 

 on each side of the median rounded ridge ; — also channelled sutures. 

 Color dark buff, inclining to brownish. Length of the carapax in the 

 female, 1.32; breadth, 1.20 inch. 



It resembles P. trisjpinosa in form. It differs from P. villosa 

 Bell, in the concave outline of its antero-lateral margin, the 

 character of the dorsal surface, and the less divergent horns of 

 the rostrum. 



Cape St. Lucas. J. Xantus. 



Pericera stibparnllela, nov. sp. 



Body covered with short tough pubescence. Carapax triangular, 

 shaped somewhat as in P. trispinosa, but much narrower, and with the 

 antero-lateral sides not concave. Lateral spines or processes subtriangu- 

 lar, but sharp, and connected with each other by a nearly straight row 

 of short spines or sharp tubercles crossing the back. A tubercle on the 

 posterior part of the gastric, and one on the intestinal region ; both very 

 small. The rostrum forms one-fourth of the length of the carapax, with 

 the horns nearly parallel, being scarcely farther apart at their extremities 

 than at the base, where they are connected for one-third their length 

 by a web-like expansion of the front. The distance between the tips of 

 the horns of the rostrum equals three-fifths that between the tips of the 

 praeorbital spines ; the upper sides of these horns are clothed with curled 

 hairs or crispatc seta3, which extend posteriorly in the same longitudinal 

 lines as far as the branchial regions, and also clothe the sides of these and 

 the hepatic regions. The median concavity of the front between these 

 two lines — continuous on the gastric region — is destitute of crispate 

 setae. The moveable part of the external antennse is concealed beneath 

 the rostrum ; the anterior spine of the basal joint is small and slender, but 

 exposed from above. Orbital tubes prominent. Chelipeds in the male 

 a little shorter than the carapax. Ambulatory feet rather short. Length 

 of the carapax in the male, 1.02; breadth, 0.8 inch; (spines included.) 



St. Thomas. A. H. Kiise. 



