DECAPOD CRUSTACEANS OF THE BEAUFORT, N. C, REGION. 4OI 



Cambarus diogenes Girard. Solitary crawfish. PI. xxviii. fig 4. 



Cambarus diogenes, Girard, 1852, p. 88; Faxon, 1885, p. 71: ibid., 1914, p. 400; Fowler, 1912, pp. 102-103. 



Carapace subcylindrical, compressed anteriorly, without spines and only lightly granulate on the 

 sides; rostrum rather narrow, short, its upper siuface rather deeply concave and lightly foveolate at 

 the base. Chelipcds large and heavy; chelse broad, heavily punctate, fingers ribbed above and below. 

 Third pair of walking legs of the male with a hook on the third article. First abdominal appendages 

 of the male short, strong and twisted, the posterior edge bearded at the base and with two backwardly 

 directed teeth at the distal end. Abdomen shorter than the cephalothorax. 



Length, 75 to 80 mm. 



Color, very dark brown or olive brown, sometimes almost black; edges of rostrum, postorbital 

 ridges and tips of chelse and legs orange red. 



Although this species had been collected in various other parts of North Carolina it was not until 

 the summer of 1913 that it was met witli in the Beaufort region. At that time several specimens were 

 taken from holes which they had dug along the edge of a swamp on the north side of Cullys Creek, 10 

 or 12 miles north of the laboratory. In most cases these holes were surmounted by low and poorly 

 constructed chimneys. 



Cambarus uhleri Faxon. Uhler's crawfish. PI. xxvrn, fig. 6. 



Cambarus uhleri, Faxon, 1884, p. 116; ibid., 1885, p. 77; ibid., 1914, p. 400. 



Distinguishable from C. diogenes by the rostrum, which in this species is nearly plane above, with 

 a very low and indistinct carina, behind which there is a shallow foveola. The abdomen is commonly 

 longer than the cephalothorax. 



Length, 60 to 75 mm. 



Color, yellowish or greenish brown, lighter on the sides; rostrum, chelae, and legs with yellow, or 

 orange. 



One or two specimens of this crawfish were secured in 1913 on the south side of Cullys Creek. 

 They were taken from holes which they had dug at the edge of ponds in the woods. 



Section ANOMURA. 



Reptantia having the abdomen more or less reduced, asymmetrical, flexed beneath 

 the thorax or imperfectly armored but almost always with biramous appendages on 

 the sixth segment; the cephalothorax usually depressed; the carapace free from the 

 epistome; a movable antennal scale often present; the third pair of legs unlike the first 

 and the last pair markedly different from the third. 



This section is divided into 4 tribes, all of which are represented in the Beaufort 

 fauna. 



Tribe GAI.ATHEIDEA. 



Anomura having the abdomen relatively well developed, not closely folded under 

 the thorax, symmetrical and with well-developed pleura, but to some extent not capable 

 of complete extension, the cephalothorax more or less depressed, and the second to 

 fourth pairs of legs with the dactyl not curved and flattened. 



Of the 5 families into which this tribe is divided 2 are represented in our fauna. 



Family GALATHEIDAE. 



Galatheidea having the abdomen not folded under the thorax, the second antennae 

 with a four-jointed stalk, the arthrobranchs normally placed, and the third maxilli- 

 peds with mastigobranchs. 



This family comprises 8 genera, of which 2 occur in the Beaufort region. 



