CRAYFISHES. 369 



Cambarus clarkii paeninsulanus, subsp. nov. 



The examples of Clark's crayfish found in the peninsular portion of the 

 State of Florida differ slightly, albeit constantly, from the typical Texas form 

 in being smoother, in having a more tapering rostrum, and a shorter and broader 

 antennal scale ; there is moreover a slight difference in the shape of the tip of the 

 male sexual appendages: the anterior terminal tooth being narrower and more 

 acute than in the typical form in which this tooth is l)roadcr, more laminate and 

 less acute at the tip; in the Floridan subspecies, too, the anterior lialf of the tel- 

 son bears on each side from three to five spines, while in the typical C. clarkii 

 there are but two spines on each side. 



Tijpe: M. C. Z., No. 3,530, 1 d" f • II. Three miles below Horse Landing, 

 St. John's River, Florida, Feb. 9, 1869, J. A. Allen. 



There are a good many specimens of this subspecies in the U. S. National 

 Museum collected by W. C. Kendall at Beecher's Point, St. John's River, Fla., 

 in February and March, 1897, Nos. 28,587, 28,589. 



Cambarus wiegmanni Erichson. 



This species is still imperfectly known; Erichson's type, which came from 

 Mexico, is no longer extant; it was described as having hooks on l)oth the third 

 and fourth pairs of legs in the male. A female individual from Mexico, in the 

 collection of the Academy of Natural Sciences of Philadelphia, was referred to 

 this species by Dr. Hagen and myself, although witli some doubt on account of 

 the want of male specimens. In 1906 Dr. Ortmann (Proc. Washington Acad. 

 Sci., 8, p. 15-19) described and assigned to this species a male belonging to the 

 Philadelphia Academy, collected by Professor E. D. Cope in 1885 in Lake Xochi- 

 milco, south of the City of ]\Iexico, in the Federal District; in this specimen the 

 legs of the third pair arc furnished with a very small tubercle only, while those 

 of the fourth pair are armed with a strongly de\'eloped hook. 



Four specimens, three male, one female, recently collected by Mr. W. M. 

 Mann at San Miguel, State of Hidalgo, Mexico, and now in the Museum of 

 Comparative Zoology, conform to Ortmann's description of the Cope specimens, 

 barring the fact that there is no vestige of even a tubercle on the third pair of 

 legs of the male, the fourth pair alone being provided with hooks; these speci- 

 mens may represent an undescribed species, but on account of the sad dearth of 

 requisite material and the loss of the type of C. wiegmanni the elucidation of 

 this question must needs be deferred to a later time. 



