66 ASTACIDtE. 



spines beneath the brachium, except the two apical ones, are nearly or 

 quite obliterated, as in C. juvenilis. The external maxillary legs are 

 not barbated beneath. 



The largest male : Long. corp. 3.5 ; long. ped. antic. 2.5. 



Patria : Lebanon, Tennessee ; Quincy, Illinois ; Texas. 



I have seen more than twenty examples, male (Forma I. and LT.) and 

 female. In the males, Forma II., the abdominal legs are not articulated 

 at the base. 



Cat. No. 289, Lebanon, Tenn., Mr. J. M. Safford. Male Form I. and 

 II. Fern. Spec. 12 * 



Cat. No. 296, Quincy, 111., Dr. Watson. Male Form I. Spec. 1. 



Cat. No. 170, Texas, G. Stolley. Male Form I. and II. Fern. Spec. 

 12* 



18. Cambarus juvenilis Hagen. 



Figures on PI. I. and III. 



First abdominal legs of the male : 



first form, fig. 29 in front; fig. 30 (Tab. II.) viewed more outwardly ; fig. 31 outside. 



second form, fig. 32 in front ; fig. 33 outside. 

 Antennal lamina, fig. 157, a ; epistoma, b ; spine of the second joint of the exterior antenna, c. 



Mas, Eostro angusto, longiori, sulcato, marginibus basi divergentibus, 

 crassioribus, costato-lineatis ; acumine triangulari, angusto, acuto, sinu- 

 ato, spina utrinque brevi fusco-cornea, subrejecta ; cretis subparallelis, 

 vix elevatis, sulcatis, spina antica brevi, fusco-cornea. Antennis corpore 

 paulo longioribus, articulo basali dente externo brevi, articulo secundo 

 dente subnullo; articulo antennarum internarum basali dente infero 

 acuto, magis apicali ; lamina parva, rostro fere longiori, angusto, mar- 

 gine externo late inflato, apice longius spinoso. Epistomate lato, antice 

 obtuso-angustiori, lateribus sinuatis, angulis basalibus paulo prominenti- 

 bus. Pedibus maxillaribus externis intus summaque basi subtus villosis. 

 Thorace fere cylinclrico, subclepresso, punctato, punctis ad rostri basin 

 profundis crebrioribus, lateribus leviter granulosis; linea modice pro- 

 funda, vix sinuata, utrinque fissa, spina parva acuta; spina antica infera 

 nulla ; areola angusta, plana postice paulo latiori. Postabdomine tho- 

 racis latitudine, fere leevi, segmentis penultimis angulo externo obtuso ; 

 lamina media parte apicali breviori, rotundata, parte basali apice angus- 

 tiori, sinuata, utrinque bispina. Pedibus anticis latis, brevibus ; chela 

 lata, depressa, ubique grosso-punctata, margine interno brevi, incurvo, 

 tuberculis squamosis serrato ; cligitis longioribus, rectis, costatis, ad 

 marginem internum lineato-punctatis, externo subtus basi barbato; 

 carpo lato, extus oblique truncato, sublaavi, spina interna media obtusa, 

 subtus antice spinis duabus obtusis ; brachio brevi, lsevi spinis duobus 

 obtusis anteapicalibus, oblique positis, subtus fere nudo, spinis cluabus 

 anticis. Pedibus tertiis articulo tertio unguiculato ; pedibus quintis 



