128 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



Cheliped of male one and one-sixth times as long as carapace. Merus 

 half as broad as long, inferior border hairy. Carpus without spines but 

 with an inner setose margin. Manus tumid, length and height subequal, 

 outer surface convex, pilose, margins setaceous. Fingers short, hairy, 

 denticulate, meeting with a gape in the proximal two-thirds with one 

 tooth of the dactyl conspicuous. Cheliped of female slightly less than 

 length of carapace, hand more slender, fingers longer, almost meeting 

 when closed. 



Ambulatory legs relatively short and stout. First leg of male twice 

 as long as carapace, dactyl one-third as long as propodus. Second, third, 

 and fourth legs decreasing in order. Dactyli of all legs, including first, 

 falcate, inner margins denticulate. Propodi of legs three and four stout, 

 as strongly curved as their dactyli, each with a basal tuft of hair suggest- 

 ing a thumb process against which the dactyl folds. (Garth, 1940, 

 abridged) 



Male abdomen with a prominent tubercle on first segment. 



Supplementary description: To afford a more direct means of com- 

 parison with other species treated, the following additional information 

 is given. The length of the rostrum in proportion to the postrostral 

 portion of the carapace varies from one-sixth in the type specimen, a 

 male, to one-twelfth in a 9.5 mm female, the ratios being 1: 6.18 and 

 1 :12.4, respectively. The length of the first ambulatory leg as compared 

 to the total length of the carapace is two and a quarter times in the male 

 and one and three-quarters times in the female, the ratios being 2.27:1 

 and 1.73:1, respectively. The ratio of the first ambulatory leg to its 

 propodus is 2.27:1 in the male and 2.77:1 in the female, which is more 

 than the one-third mentioned in the original description. The proportion 

 of the dactyl of the fourth ambulatory leg to its propodus is approxi- 

 mately 4:5. The number of clusters of curved hairs which may be 

 counted along the propodal segment of the first leg is 9 in the female. 



Material examined: 10 specimens from 7 stations, including three in 

 Mexico and one each in Costa Rica, Panama, Colombia, and Ecuador. 

 (See Table 21) 



Measurements: Male holotype: length 11.0 mm, width 7.8 mm, 

 cheliped 13.0 mm, chela 5.4 mm, dactyl 2.4 mm, first leg 26.0 mm. 

 Female: length 9.5 mm, width 7.4 mm, rostrum 0.7 mm, cheliped 10.0 

 mm, chela 4.0 mm, dactyl 1.7 mm, legs 16.5, 13.3, 12.8, and ca. 9.0 mm. 



Color in life: Not known. 



Habitat: Rocky bottom in three of five instances, the others being 

 sand and sand with mud. 



