CAMBARUS. Ui 
of male hooked. First abdominal appendages of male and annulus of female 
as in O. Diogenes. 
Length, 76 mm. 
Known Localities. — Dominion of Canada: Toronto, Prov. Ontario. Mich- 
igan: Detroit, East Saginaw (Coll. Peabody Mus. Yale Coll.). Indiana: New 
Albany. Louisiana: New Orleans (Coll. U. 8. 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, ete. 
The types of this species were dug out of burrows in solid blue clay in 
Detroit, Mich., by Mr. H. 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. figs. 8, 8', 8a, $ a’ (first abdominal appendages of male *). 
Cambarus Uhleri, Faxon, Proc. Amer. Acad. Arts and Sci., XX. 116, 1884. 
Male, form I.—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. Antero-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. Antenne 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. Udleri was accidentally omitted by the artist. 
