42 ASTACIDiE. 



impressa. Postabdomine subangustiori, lsevi ; segmentis penultimis 

 angulo externo obtuso ; lamina media parte apicali vix breviori, antice 

 subrotundata ; parte basali apice sinuata, utrinque bi-(vel tri)-spinosa. 

 Pedibus anticis elongatis, corpore vix brevioribus ; chela longa, crassi- 

 ori, squamoso-tuberculata, margine interno longo, subrecto, densius 

 tuberculato et fortiter dentato ; digitis paulo longioribus, arcuatis, sub- 

 costatis, leviter punctato-lineatis, apicibus acutis, incurvis ; intus apice 

 squamosis, basi serratis ; digito externo tuberculo medio et basali inter- 

 nis majoribus obtusis ; digito mobili sublongiori, basi sinuata, tuberculo 

 majori. Carpo longo, laevi, intus subtuberculato, spina media interna 

 majori ; subtus spinis duabus anticis majoribus. Brachio rostro longiori, 

 extus lsevi, intus ante apicem tuberculis nonnullis minoribus; margine 

 superiori leviter tuberculoso, spinis duabus majoribus oblique positis ; 

 subtus biseriatim spinoso, spinis apicalibus validis. Pedibus tertiis et 

 quartis articulo tertio unguiculato ; pedibus quartis capitulo basali, 

 latiori ; quintis lamina quadrangulari, parva elevata. Pedibus abdomi- 

 nalibus brevibus, rectis, parte interna intus lata, plana, spina media 

 posteriori, apice bifida ; ramo antico brevi, fusiformi, acuto ; ramo postico 

 longiori, laminato compresso ; parte externa cylindrica, valde bi-attenu- 

 ata, dente apicali brevi, fusco corneo, triangulari. 



Forma II. differt chelis brevioribus, unguiculis pedum minoribus ; 

 pedibus abdominalibus basi articulatis, parte interna ramo interno fere 

 obtuso ,- parte externa dente apicali minori nee fusco corneo ; spina 

 thoracis laterali interdum distincta. 



Femina differt antennis chelisque brevioribus, minoribus ; ventre 

 inter pedes tertios tuberculato, inter pedes quartos nudo ; annulo 

 obovali, fissura longitudinali, dentibus alternis, modice inflatis ; annulo 

 mobili, nee ventre preecedenti connato. 



Long. 3. Mas maximus; long. 3.8; ped. ant. 3.7; antenn. 3.5. 



Patria : Charleston, South Carolina; Lawn Ridge, Illinois; Rocky 

 River, Olmsted, Ohio ; Georgia. 



(Habitat in Georgice oryzaceis, ubi spiracula 4 unc. alta format. 

 LeConte.) 



I have seen many very young specimens 0.6 inch long. 



From Georgia I have seen but four specimens, two males (Forma I.), 

 and two females. The first abdominal legs in the male are a little 

 different in shape. The tip is more recurved, not straight as in the 

 others. Apparently this is the veritable A. troglodytes LeC, and the 

 intermediate lamina is always trispinose. 



A. troglodytes male type LeConte (Mus. Philad.), with the dimensions 

 given by Mr. LeConte, is identical with the males from Charleston. 

 The abdominal legs are (Forma I.) similar ; the lamina, is trispinose. 



