66 ASTACIDvE. 



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 ; Qviincy, Illinois ; Texas. 



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

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

 at the base. 



Cat. No. 289, Lebanon, Tenn., Mr. J. M. Saiibrd. Male Form L and 

 II. Fern. Spec. 12.* 



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



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

 12.* 



18. Cambarus juvenilis Ilagen. 



Figures on PI. I. and III. 

 First abdominal less of tlie male : 



first form, fig. 29 in fi-ont; fig. 30 (Tab. II.) viewed more ontwardly ; fig. 31 outside, 

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

 Antcnnal lamina, fig. 157, a ; cpistoma, h ; spine of the second joint of the exterior antenna, c. 



Mas. Rostro angusto, longiori, sulcato, marginibus basi divergentibus, 

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

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

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

 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 intlato, apice longius sjjinoso. Epistomate lato, antice 

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

 bus. Pedibus maxillaribus externis intus summaque Ijasi subtus villosis. 

 Thorace fere cylindrico, suljdepresso, 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 Itevi, 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 ; digitis longioribus, recti.s, costatis, ad 

 marginem internum lineato-punctatis, externo subtus basi barbato ; 

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

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

 obtusis anteapicallbus, oblique positis, subtus fere nudo, spinis duabus 

 anticis. Pedibus tertiis articulo tertio unguiculato ; pedibus quintis 



