CAMBARUS. 77 



of male hooked. First abdominal appendages of male and annulus of female 

 as in G. Diogenes. 



Length, 76 mm. 



Known Localities. — Dominion of Canada : Toronto, Prov. Ontario. Mich- 

 igan : Detroit, East Saginaw (Coll. Peabodj Mus. Yale Coll.). Indiana : New 

 Albany. Louisiana : New Orleans (Coll. U. S. Nat. Mus.). North Carolina : 

 Kinston. 



Closely related to C. Diogenes, but at once distinguished by the sharply 

 compressed fingers bearded at the base, excised thumb with a single row of 

 tubercles on external margin, non-angulated anterior border of carapace, etc. 

 The types of this species were dug out of burrows in solid blue clay in 

 Detroit, Mich., by Mr. IL G. Hubbard, in August, 1873. The burrows were 

 three to five feet deep. At the bottom of each burrow was a pocket in a 

 layer of loose gravel and clay, holding water. Just above the water line an 

 enlargement in the burrow formed a shelf on which the animal rested. 



Specimens from Kinston, N. C, and New Orleans, La., which I have 

 referred to this species, are not adult, and cannot be determined with 

 absolute certainty. 



29. Cambarus Uhleri. 



Plate VIII. fit;s. H, 8', 8 a, 8 a' (first abdominal appendages of male*). 

 Cambarus Uhleri, Faxon, Proc. Amev. Acad. Arts and Sci., XX. 116, ISS-t. 



Male, form L — Rostrum of moderate length, sides nearly parallel to base 

 of acumen, which is broadly triangular, acute ; no lateral spines ; upper 

 surface of rostrum plane, punctate, lightly foveolate at base, margins raised 

 into a low, sharp crest, punctate-lineate ; there is a faint trace of a median 

 longitudinal carina. Post-orbital ridges without anterior spines, swollen 

 posteriorly. Carapace oval, punctate, granular on sides. Antei'o-lateral 

 border not angulate or notched. No lateral or branchiostegian spines. 

 Cervical groove sub-sinuate. Areola none. Abdomen longer than cephalo- 

 thorax. Anterior segment of telson bispinose on each side, posterior seg- 

 ment round behind. Epistoma triangular. AntenniB short, with very small 

 spines on the second and third segments, scale short, broad, inner margin 

 rounded. Third maxillipeds hairy within and beneath. Chela moderate, 

 hand inflated, punctate, ciliate, inner margin ornamented with a row of sharp 



* The full figure of C. Uhleri was accidentally omitted by tlic artist. 



