CAMBARUS. 23 



branchial region, half-way between the areola and the lower bonier, and 

 a whitish longitudinal band on each side of the abdominal somites, these 

 bands not reaching to the hind border of the somites. The tubercles of the 

 chelae are black, and there are dark spots on the margin of the rostrum. 



Dr. Abbott* states that in Trenton, N. J., this species frequents " running 

 streams which have masses of vegetation growing in them, the animal in 

 question resting upon the plants, usually near the surface of the water. We 

 have found since our collecting excursions, on carefully approaching clear 

 running streams, such as just mentioned, that this crawfish is to be seen 

 resting on the plants, always with the head directed above stream. If dis- 

 turbed, they would dart backwards down to the roots, apparently, of the 

 plant upon which they were sitting. After a lapse of about ten minutes, 

 they would return to their former resting-place, creeping up the plant 

 down which they had so suddenly darted tail foremost." 



Mr. P. R. Uhler, in his studies on the distribution of the crayfishes of 

 Mar viand, finds that this species belongs to the lowlands at the mouth of 

 sluggish rivers, or near the ocean in muddy and grassy ditches and drains, 

 and even in salt water, in company with C. Uhleri. In his collection are 

 specimens from near Ocean City, Worcester Co., Md., found in a ditch in 

 holes six to nine inches deep. At Goldsborough, N. C, the same gentleman 

 found it abundant in drains and branches running through cotton fields, 

 tributaries of the Neuse River. 



C. Blandingii, var. acuta, attains a very large size. The largest I have 

 sen, a male of the first form, is 5| in. in length. The cheliped is G^ in., the 

 chela 3| in. This specimen is in the Museum of Comparative Zoology. 



2. Cambarus fallax. 



Plate II. tie- 4. 



Cambarus fallax, Hagbn, HI. Cat. Mus C p. Zool., No. III. p. 45, PI. I. figs. 103-105, 1870. 



Cambarus fallax, Faxon, Proc V.mei Lead. Arts and Sci., XX. 136, 1884. 



Shown Localities. — Florida : St. John's River at Jacksonville, Orange Bluff, 

 Ilawkinsville, Horse Landing, Blue Spring (Coll. Peabody Acad. Sci.), and 

 I, ;i ke Jessup (Coll. D. S. Nat. Mus.) ; Magnolia (Coll. Boston Soc. Nat. Hist.) ; 

 [ndian River (Coll. U. S. Nat. Mus.. Yale Coll.); Titusville, Brevard Co. 

 (Coll. U. S. Nat. Mus.). 



* Airier. Naturalist, VII 80. 



