astacid^. 83 



Cat. No. 195, Lawn Ridge, 111., Mr. A. Ordway. Fern. Spec. 1. 



Cat. No. 197, Lawn Ridge, 111., Mr. A. Ordway. Male. Fern. Spec. G. 



Cat. No. 1848, Petersburg, Va. Fern. Spec. 1. 



Cat. No. 229, Arkansas, Mr. G. Stolley. Male. Spec. 1. 



Cat. No. 242, New Orleans, Mr. Lawrence. Fern. Spec. 1. 



Dry Spec. Lake Michigan, Professor C. Marey. Fern. Spec. 1. 



27. Cambarus Nebrascensis Girard. 



Cambarus Nebrascensis Girard, Proc. Pliilad. Acad. N. Sc, No. 10, T. 6, p. 91. 



" Rostrum intermediate in form between that of C. rohistus and C. 

 Diogenes!' "Dorsal lines of suture of the carapace in close contiguity. 

 Large claw nearly conical, giving to the species a very peculiar aspect." 



" Fort Pierre, Nebraska ; collected in 1850 by Thaddeus Culvertson." 

 — Girard. 



I have never seen any Cambarus agreeing with the description given 

 by Mr. Girard, and I have not seen a typical specimen of C. Diogenes, 

 the species compared with C. Nebrascensis. I have spoken of all the 

 species of Cambarus with a linear areola under C. manicalatus. None of 

 these several species agrees with the description given of C. Ne- 

 brascensis. 



28. Cambarus latimanus LeConte. 



Astacus latimanus LeConte, Proc. Acad. Pliilad. N. Sc, T. 7, p. 402. 



Figures on PL I. and III. 



First abdominal leg of the male : 



first form, fig. 43 in front ; fig. 44 outside, 

 second form, fig. 45 in front ; fig. 46 outside. 



Antennal lamina, fig. Ifi2, a ; epistoma, 6; spine of the second joint of the exterior an- 

 tenna, c. 



Mas. Rostro brevi, basi lato, turn sensim angustiori, fere triangulari, 

 ante apicem leviter sinuato, acumine brevi, acuto ; rostro supra ex- 

 cavato, basi foveolato ; marginibus lineato punctatis ; acumine vix mar- 

 ginato ; cretis parvis, postice subdivergentibus, extus linea impressa, 

 antice obtusis. Antennis gracilibus, thorace longioribus, articulis duo- 

 bus basalibus dentibus externis parvis acutis ; antennis internis articulo 

 basali dente infero anteapicali parvo ; lamina brevi, angusta, apice lati- 

 ori, margine externo inflato, spina acuta apicali. Epistomate latiori, 

 antice truncato, spina parva media ; lateribus obliquis, angulis obtusis ; 

 pedibus maxillaribus externis intus barbatis. Thorace leviter ovato, 

 parce punctato, lateribus granulosis vel tuberculosis; linea profunda, 

 sinuata, spina utrinque laterali modica vel obsoleta ; spina antica infera 

 subnulla ; areola modica, plana, antice paululum carinata, postice latiori. 

 Postabdomine vix angustiori, lsevi, segmentis anteapicalibus angulis ex- 



