ASTACIDiE. 67 



capitulo basali brevi. Po(ril)us alHloininalilnis long^is, sii1)contortis. longe 

 bifidis, (lonto medio «upero, partibus a])icalibiis gracilibus, spinilbnuibus, 

 mterna breviori, ante apiceiu sul)latioi-i. 



Forma 11. Diftert pcdibus abdominabbus In-evioribus, basi articu- 

 latis, apice modo bifidis, partibus apicalibus inflatis, cylindrici.s, dente 

 medio supero nullo. 



Vidi mares adultos similes, scd pedibus abdominalibus basi non articu- 

 latis. 



Femina differt abdominc latiori, cholis angustioribus, minus pimcta- 

 tis, sublasvibus ; venter inter pedes quartos nndo, fere piano ; annulo 

 magno, transverso, fissura transversa lata, profunda, antice bitubercu- 

 lata. 



Long. Corp. 2.5 ; antenn. 2.6 ; ped. cbel. 1.8. 



Patria : Little Hickman, Kentucky Kiver ; Osage Eiver. 



Vidi mares utriusque formaj, ac feminas, permultos. 



This species is very similar to C. virilis Hag., but smaller, the thorax 

 nearly cylindrical, more flattened above ; the rostrum is smaller, deeply 

 sulcated, with the margins thickened and laterally not so sharply rec- 

 tangular, but more oblique ; the three apical teeth are more developed ; 

 the antennal lamina is smaller, the hands throughout are punctated and 

 more flattened, the spines of the carpus and brachium obtuse ; the or- 

 dinarily biseriated spines beneath are not at all developed, except the 

 two anterior. 



Cat. No. 213, Little Hickman, Kentucky Eiver, Mr. A. Hyatt. Male 

 Form I. Fem. Spec. 12.* 



Cat. No. 1834, Little Hickman, Kentucky River, Mr. A. Hyatt. Male 

 Form H., first pair of abdominal legs articulated or not articulated. 

 Spec. 12.* 



Cat. No. 271, Osage River, G. Stolley. Male. Spec. 1. 



19. Cambarus propinquus Girard. 



Cambarus propinquus Giranl, Procccil. Acad. Pliilad., T. YI. p. 88. 



Figures on PI. I. and III. 

 Antennal lamina, fig. 158, a; cpistoma, b ; spine of the second joint of the extci-ior antenna, c. 

 First abdominal legs of the male : 



first form, fig. 34 in front; fig. 35 variety; fig. 3G outside. 



second form, fig. 37 in fi-ont; fig. 38 outside. 



Mas. Rostro angustiori, elongato, subexcavato, marginibus paral- 

 lelis, punctato-lineatis, apice utrinque sinuatis, spinis lateralll)us per- 

 parvis fusco-corneis ; acumine triangulari, acuto, latitudine rostri longi- 

 ori, supra leviter carinato ; cretis basalibus In-evibus, margine distantibus, 

 parallelis, vix elevatis, sulcatis, antice truncatis. Antennis corpore bre- 

 vioribus, dentibus articulorum basalium brevibus acutis; antennis inter- 

 nis dente anteapicali infero interno acuto j lamina rostri longitudine. 



