1852] 91 
Ld 
tufts of fine hairs. Anterior pair of abdominal legs, elongated, resembling some- 
what in shape those of C. robwstus, to which it bears a close relationship. 
~— Locality.—California. Collected by the lamented Dr. William Gambel, to 
whose memory we inscribe the species. Specimens are deposited at the Academy 
of Natural Sciences of Philadelphia. 
16. CamBaRUS NEBRASCENSIS, Girard.—Rostrum intermediate, in form be- 
tween that of C. robustws and C. diogenes. Dorsal lines of suture of the cara- 
pace in close contiguity. Large claw nearly conical, giving to the species a very 
peculiar aspect, | 
Locality.—F ort Pierre (Nebraska) ; collected in 1850 by Thaddeus Culbertson. 
Third Group.— Rostrum very much elongated, conical, tapering, provided on 
both sides and rather near the extremity with a small and acute spine, some- 
times, however, but very slightly developed. 
17. Camparus Buanpinel, Erichs. Arch. f. Naturg. 1846, I, 98. 
Astacus Blandingit, Haru. Faun. Amer. & Trans. Philos. Soc. Philad. N.S. 
IIL, 1830, 464; Med. & Phys. Res. 1835, 229, fig. 1. 
Localities.— Marshes and rivulets of Southern States (Harlan) ; Summerville, 
S. C. (Girard). 
18. Camparus Crarxi, Girard.—Antenne long and slender, nearly as long 
as the body and tail. Rostrum tapering, but very gradually from its base to 
the lateral spines, though the terminal point is more elongated than in C. Blan- 
dingit, Anterior pair of abdominal legs terminated by two nearly equal and 
rounded tubercles. 
Locality.—Between San Antonio (Texas and El Paso del Norte ; collected by 
John H. Clark, Esq., under Lieut. Col. J. D. Graham, late head of Scientific 
Corps U.S. Boundary Commission. 
19. Camparus, acutus, Girard.—Rostrum proportionally shorter than in both 
C. Blandingw and C.acutissimus ; very broad at its base, and tapering very 
suddenly towards its extremity. The lateral spines of the rostrum are scarcely 
to be seen in this species; the tip is likewise very short although very acute. 
The structure of the anterior pair of abdominal legs in the male, differs from 
that of C. Blandingii and C. Clarkii, by the more slender shape of the termi- 
nating tubercles. The antenne have nearly the same proportional length as in 
C. Clarkit.’ 
Locality.—F rom an affluent of Mobile river in Kemper Co., Miss. ; specimens 
received from D. C. Lloyd, Esq. 
20. CamBarus acutissimus, Girard.—Rostrum much more elongated than in 
any of the species of the same group; very much tapering and very acute, with 
slight indications of the lateral spines which are so well developed in C. Blan- 
dingit. The anterior abdominal] pair of legs is terminated by a slender and re- 
curved tip. 
Locality.—Found with the preceding and sent by the same gentleman to Pro- 
fessor Baird. 
The Committee on Dr. Leconte’s Synopsis of the Anthicites of the 
United States, reported in favor of publication in the Proceedings : 
Synopsis of the Anthicites of the United States. 
By Joun L. LeConre, M. D. 
Although it is but three years since M. de la Ferté Sénectére published his 
very beautiful and elaborate monograph of Anthicus, yet the species known to 
inhabit our territory have almost doubled in number. Most of these have been 
published by me already in the Annals of the Lyceum of Natural History of 
New York, and in Prof. Agassiz’s work on the Physical Character of Lake 
Superior. The object I had in view in the beginning of my study of this group, 
