ASTACIDJ5. 67 



capitulo basali brevi. Pedibus abdominalibus longis, subcontortis, longe 

 bifidis, dente medio supero, partibus apicalibus gracilibus, spiniformibus, 

 interna breviori, ante apicem sublatiori. 



Forma II. Differt pedibus abdominalibus brevioribus, basi articu- 

 latis, apice modo bifidis, partibus apicalibus intiatis, cylindricis, dente 

 medio supero nullo. 



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

 latis. 



Femina differt abdomine latiori, cbelis angustioribus, minus puncta- 

 tis, sublsevibus ; venter inter pedes quartos nudo, 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 River ; Osage River. 



Vidi mares utriusque formae, ac feminas, permultos. 



This species is very similar to C. viriUs 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 River, Mr. A. Hyatt. Male 

 Form I. Fern. Spec. 12* 



Cat. No. 1831, Little Hickman, Kentucky River, Mr. A. Hyatt. Male 

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

 Spec. 12* 



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



19. Cambarus peopinqitus Girurcl. 



Cambarus propinquus Girard, Proceed. Acad. Pbilad., T. VI. p. 88. 



Figures on PL I. and III. 



Antennal lamina, fig. 158, a : epistoma, b; spine of the second joint of the. exterior antenna, c. 

 First abdominal legs of the male : 



first form, fig. 34 in front ; fig. 35 variety ; fig. 36 outside. 



second form, fig. 37 in front; fig. 38 outside. 



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

 lels, punctato-lineatis, apice utrinque sinuatis, spinis lateralibus per- 

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

 ori, supra leviter carinato ; cretis basalibus brevibus, margine distantibus, 

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

 vioribus, dentibus articulorum basalium brevibus acutis; antennis inter- 

 nis dente anteapicali infero interno acuto; lamina rostri longitudine, 



