CAMBARUS. 59 
GROUP III. (vrs, C. Bartonii.) 
Third segment of third par of legs hooked. First pair of abdominal appen- 
dages of the male thick, the inner and outer parts each terminating in a short 
recurved tooth. 
The more typical forms of this group have no lateral teeth on the ros- 
trum, but in C. extraneus, Jordau, Girardianus, cornutus, and hamulatus, \at- 
eral rostral teeth are present. Of these five, only C. extraneus was known 
to Dr. Hagen, who placed it, on account of the rostral teeth, as an aber- 
rant species in the C. afims group. I think the structure of the male ap- 
pendages is of much greater value in determining the subordinate groups 
of Cambarus than the form of the rostrum, which presents every condition 
between one with well-developed lateral teeth and one with entire margins. 
C. cornutus is peculiar in the enormous development of the antennal flagella. 
C. hamulatus, like C. pellucidus in Group I., is blind. It has slender chelze, and 
resembles C. pellucidus a good deal in its general form. 
[ Areola broad. Rostrum long, tapering . . . . . . . G@. acuminatus. 
J Areola of moderate width . . . ... =.=. =. =. =. +. QO. Bartonii, C. latimanus. 
Rostrum without . : ne ' 
Areolamarrow.) =) als es) C. dubius. P’ = 
lateral teeth. Rostrum excavated above . 
Areola obliterated in the middle. {osm plane above 
¥ 
1. Uhleri. 
Tncerte sedis Y 
C 
C. Nebrascensis. 7s 
Antenne of normal size. C. Girardianus, C. Jordani, C. extraneus. 
Antenne with large flagellum, ciliate on inner side. C. cornutus. 
Mvesyrudimentaryyperr cts) se ne es yn we Ge Momulalue. 
Rostrum with Eyes well developed. 
lateral teeth. 
22. Cambarus Bartonii. 
? Astacus Bartonii, Fapricres, Suppl. Entomolog. Systemat., p. 407, 1798. 
? Astacus Bartonii, Bosc, Histoire Naturelle des Crustacés, II. 62, Pl. XI. fig. 1, 1802. (2d ed., IT. 40, 
Pl. XI. fig. 1, 1830.) 
? Astacus Bartonii, Latremur, Hist. Nat. Gén. et Partic. des Crustacés et des Insectes, VI. 240, 1803. 
(After Fabricius.) 
Astacus ciliaris, RariNesque, Amer. Monthly Mag. and Crit. Rev., II. 42, Nov. 1817. 
? Astacus pusillus, Rarrxesque, Amer. Monthly Mag. and Crit. Rev., I. 42, Nov. 1817 
Astacus Bartonii, Say, Jour. Acad. Nat. Sci. Phila., [. 167, Dec. 1517. 
? Astacus Bartonii, Desmanest, Consid. Gén. sur la Classe des Crustacés, p. 212, 1825. (After Fabricius.) 
Astacus Bartonii, Haruan, Med. and Phys. Researches, p. 230, fig. 3, 1835. 
Astacus affinis, Matxe Epwarps, Hist. Nat. Crust., I. 332, 1837. 
Astacus Bartonii, Goutp, Rep. Invert. Mass., p. 330, 1841. 
Astacus Bartonii, Tuowrson, Hist. Vermont, Part I. p. 170, 1842. (With a worthless cut.) 
Astacus Bartonii, Dn Kay, Zoology of New York, Part VI., Crustacea, p. 22, Pl. VIIT. fig. 25, 1844. 
Cambarus Bartonii, Grrarp, Proc. Acad. Nat. Sci. Phila., VI. 88, 1852. (No description.) 
C. Diogenes, C.argillicola. 
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