ASTACID^E. 63 



16. Cambarus virilis Hag en. 



Figures on PL I., II., Ill, and VIII. 

 Antennal lamina, fig. 1 55, a ; epistoma, b ; spine of the second joint of the exterior antenna, c. 

 First abdominal legs of the male : 



first form, fig. 23 in front ; fig. 24 outside ; figs. 25, 26 variety, outside, 

 second form, fig. 27 in front; fig. 28 outside. 

 Inner sexual parts of the male : 



first form, figs 128, 129 side; fig. 132 viewed more from above. 

 second form, tigs. 130, 131 side. 

 PI. VIII. Male, first form: a variety A. 



Mas. Rostro lato, fere duplo longiori, subexcavato, marginibus paral- 

 lels, antice vix convergentibus, punctato-lineatis ; ante apicem utrinque 

 subito sinuato, acuinine triangulari, acuto, rostri latitudine non longiori, 

 angusto, angulo basali laterali corneo, obtuso vel subacuto ; cretis basa- 

 libus extus sulcatis, parum elevatis, parallelis, antice truncatis, subacutis. 

 Antennis corpore brevioribus, articulis duobus basalibus dente externo, 

 parvo, subacuto ; antennis intends articulo basali dente infero medio 

 acuto intemo ; lamina rostri longitndine, lata, margine externo in- 

 flato, tipice brevi spinoso. Epistomate longitndine dimidio latiori, an- 

 tice truncate, angustiori, acumine medio brevi, lateribus obliquis, sub- 

 excavato. (Forma epistomatis variabili, antice lateribusque margine 

 vel recto, vel sinuato, vel exciso ; angulis obtusis vel rotundatis.) Pedi- 

 bus maxillaribus extends intus et subtus villosis. Thorace leviter ovato, 

 subdepresso, parce sed distincte pnnctato, lateribus scabris, cepbalo- 

 tborace medio fere lo3vi ; linea profunda modice sinuata, utrinque fissa, 

 spina brevi, valida ; spina antica infera subnulla ; areola plana, punctata, 

 medio angusta, postice magis dilatata. Postabdomine lato, tboracis 

 longitndine, parcepunctato, segmentis penultimis angulo externo ob- 

 tuso; lamina media parte apicali breviori, angulis rotundatis; parte 

 basali apice sinuata, utrinque spinis duabus validis. Pedibus anticis 

 brevibus, validis ; chela lata, planiori, obsolete punctata, intus tuberculis 

 biseriatis dentata; digitis dimidio longioribus, latis, planis, costatodine- 

 atis, fortiter punctatis ; interno recto, basi extus et intus tuberculoso- 

 dentato; externo basi margine interno tuberculoso, subtus barbato, 

 margine externo laevi, apice subincurvo ; carpo latitudine vix longiori, 

 extus oblique truncato, sul)la3vi, spina interna media majori, aliaque 

 basali minori ; subtus spinis duabus anticis validis ; bracbio brevi, la?vi, 

 spinis duabus anteapicalibus oblique positis, obtusis j subtus spinis bi- 

 seriatis acutis. Pedibus tertiis articnlo tertio unguiculato ; pedibus 

 quint is capitulo basali brevi. Pedibus abdominalibus longis, subcon- 

 tortis, longe bifidis, apice acutis, incurvis; parte externa longiori, basi 

 crassiori; parte interna apice compresso-dilatata, acuta vel obtusion. 



Forma II. Pedibus abdominalibus basi articulatis, apicibus paululum 

 divisis, crassioribus, cylindricis, minus incurvis. 



