52 ASTACID^E. 



Vidi marem majorem (Forma IT.) pedibus abdominalibus basi non 

 articulatis. 



Femina differt chelis minoribus ; ventre inter pedes quartos apice 

 exciso, tuberculis conicis duobus apice approxinatis ; annulo transver- 

 sali angusto, longitudinaliter fisso. 



Maximus. Long corp. 2.6 - 3 j antenn. 2.5 ; ped. antic. 2 - 2.5. 



Patria : Spring Hill, Alabama ; ten miles west of Mobile. — Vidi 

 specimina multa. 



Sometimes in the larger examples the thorax is more punctulated, 

 and more granulated on the sides. 



This species is very similar to C. Lecontei, but it differs in having a 

 smaller and more parallel rostrum, a shorter mesothorax, twice as broad 

 an areola, two spines on each side, somewhat shorter but broader 

 hands, its inner margin slightly curved, sulcated beneath, the fingers 

 a little curved, and the sexual parts. 



C. versutus, spiculifer, Lecontei, and angustatus (if it be not identical 

 with C. spiculifer) form a single group. The mesothorax is short; 

 the abdomen a little longer than the thorax ; the areola is broader ; the 

 lamina is longer than the pedunculus, and the rostrum long and slen- 

 der ; the spines of the antennal joints are well developed. Besides 

 the differences taken from the sexual organs, C. Lecontei and an- 

 gustatus have one lateral thoracic spine, while C. spiculifer and versutus 

 have two lateral thoracic spines. C. Lecontei is separated by long 

 and nearly cylindrical hands ; C. spiculifer, by strongly tuberculated 

 hands. . 



Cat. No. 190, Spring Hill, Ala., L. Agassiz. Male Form I. and II. 

 Fern. Spec. 12 * 



Cat. No. 1825, ten miles east from Mobile, Ala., L. Agassiz. Male 

 Form I. and II. Fern. Spec. 12 * 



10. Cambarus maniculatus LeConte. 



Astacus maniculatus LeConte, Proc. Acad. Philad., T. 7, p. 401. 



I have not seen this species, which is described by Mr. LeConte as 

 follows : — 



Rostrum subplanum, vix concavum, obtusum cum acumine, versus 

 apicem utrinque unidenticulatum. Lamina antennalis peclunculum 

 sequans. Cephalothorax supra punctatus, lateribus sparsim granulosis. 

 Areola suturalis angustissima, stria solum. Dorsum sicut in prioribus. 

 Chela parva, angusta, tuberculato-punctata, margine interiore dentata, 

 digiti recti, carinati, punctati. Carpus intus paucidentatus, dentibus 

 tribus superioribus majoribus spiculaeformibus. Brachium punctatum, 

 latere superiore vix serrato, duabus tamen spinis brevibus anterioribus, 



