88 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



Chelipeds of male short, rather stout, granulate; hand broad, in- 

 flated ; fingers nearly as long as palm, gaping at base. Chelipeds of 

 female more slender than in male; margins of hand parallel; fingers 

 slightly gaping. (Schmitt, 1921, modified) 



Ambulatory legs slender, similar, diminishing in length from first 

 to fourth pair; dactyli moderately curved, almost smooth. (Rathbun, 

 1925) 



The following significant paragraph is extracted from Rathbun 

 (1925, p. 136): 



"Young: In the adult, the postorbital tooth is large and curves partly 

 about the eye, as in typical Pyromaia; in the young, however, the 

 postorbital tooth is smaller and more slender than in the adult and is 

 directed outward and very little forward, the dactyls of all the am- 

 bulatory legs are, relative to their propodites, shorter and more curved 

 than in the adult, and armed with spinules, that is, they are more 

 prehensile. The young, therefore, are typical Inachoides." 



In addition to the typical form described above, two and perhaps 

 three races are restricted to well-defined portions of the species range. 

 One of these is represented by specimens from the northern part of the 

 Gulf of California, from San Felipe on the peninsula side to Guaymas 

 on the side of the Mexican mainland. In it the rostrum is short, the 

 branchial regions swollen, the neck stout, the granules many and coarse, 

 and the hand swollen and bare. Neorhynchus mexicanus Rathbun (male 

 holotype, U.S.N.M. No. 17350) is of this form and, in view of its 

 morphological distinctiveness and geographical isolation, its removal from 

 synonymy with Pyromaia tuberculata tuberculata and its designation as 

 P. tuberculata mexicana, new subspecies, is here proposed. 



A second form is represented by Crane's specimens from Santa Inez 

 Bay and by Hancock expeditions material from outside Conception and 

 Angeles Bays on the Gulf coast of Lower California. In this form the 

 rostral spine is long and the gastric and cardiac spines upstanding. 

 Rathbun (1925) calls it variety A, adding that the legs are particularly 

 long and slender, the granules few, and the postorbital tooth points out- 

 ward. Sufficient material from the Bay of Panama is not available from 

 which to determine whether the two specimens designated by Rathbun 

 (loc. cit.) as variety B are identical with one of the above or should 

 be considered as representing a third race of this polytypic species. The 

 situation is further complicated in that specimens not extreme in either 

 respect occur off California, in the Gulf of California at localities other 

 than those mentioned, and off Colombia. 



