1852.] 91r 



tufts of fine hairs. Anterior pair of abdominal legs, elongated, resembling some- 

 what in shape those of C. rub-usttts, 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 robiistus 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. Fort Pierre (Nebraska) ; collected in 1850 by Thaddeus Culbertson. 



Third Group. Kosixuvcx very much elongated, conical, tapering, provided on 

 both sides and rather near the exlremiry with a small and acute spine, some- 

 limes, however, but very sliirhtly developed. 



17. Cambarus Blandingii, Erichs. Arch. f. Naturg. 1846, I, 98. 



Astacus Blandingii, Harl. Faun. Amer. & Trans. Philos.Soc. Philad. N. S. 

 Ill, 1830, 464; Med. & Phys. Res. 1S35, 229, fig. 1. 



Localities. Marshes and rivulets of Southern States (Harlan) ; Summerville, 

 S. C. (Girard). 



18. Ca:mbarus Clarkti, Girard. Antennae 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- 

 dingii. Anterior pair of abdominal legs terminated by two nearly equal and 

 rounded tubercles. 



Locality. Between San Antonio (Texas) andEl 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. Cambarus acutus, Girard. Rostrum proportionally shorter than in both 

 C. Blandingii and C acutissivnis ; 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 antennae have nearly the same proportional length as in 

 C. Clarl'ii, 



Locality. From an affluent of Mobile river in Kemper Co., Miss. ; specimens 

 received from D. C. Lloyd, Esq. 



20. Cambarus AcuTissiML'S, 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- 

 dingii. 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. Leeonte's Synopsis of the Anthicites of the 

 United States, reported in favor of publication in the Proceedings : 



Synopsis of the Jnthicites of the United States. 

 By John L. LeConte, M. D. 



Although it is but three years since M. de la Ferte Senectere 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, 



