14:^ 



i. cjambai'tis negleetus sp. nov. — ^Male, form I. — Rostrum broad, sub- 

 excavated, with a median longitudinal carina; sides nearly parallel from the 

 base to the lateral spines, which are very sma'l, brown, and borny : acumen 

 of moderate length. Post-orbital ridges with very small anterior spines, or 

 none. Carapace oval, flattened above, punctate, lightly granulate on the 

 sides, lateral spine obsolete, antero-lateral border angulated below the eye ; 

 areola of moderate width, dilated anteriorly and posteriorly. Abdomen 

 e<|ual to the cephalothorax in length; basal segment of the telson two- 

 spined on eacli side. Anteniife shorter than the body ; lamina as long as 

 the rostrum, broadest toward the distal end, apical spine of moderate 

 length. Anterior process of tfie epistoma long, subtruncate. Third pair 

 of maxillipeds hairy within, naked below. Chelipeds short; chela broad, 

 punctate above and below, inner margin furnished with a double row of de- 

 pressed squamous tubercles: fingers of moderate length, more or le.ss gap- 

 ing at the base, with a row of round tubercles on their opposed edges, outer 

 margin of the movable figer furnished with low tubercles. Carpus broad, 

 punctate above, with a strong median spine on the internal border and a 

 small one near the base ; there are no spines below. Superior border of 

 meros armed with two obli((uely-placed ante-apical spines; the lower face 

 of the meros presents two rows of spines. Third segment of the third 

 pair of legs hooded. First pair of abdominal appendages nearly straght, 

 terminating in two long, slender, pointed, horny styles; the anterior style 

 (outer part of the appendage) a little longer than the posterior and slightly 

 recurved. 



In the second form of the male the first abdominal appendages are cleft 

 but a short distance. The terminal part of the appendages is stouter and 

 not corneous, and the tips of the rami are rather blunt. 



In the female the annulus ventralis presents a deep transverse fossa, 

 bounded on all sides by a pr(nninent wall, which is bituberculate in front. 



Length of a male, form II.. 74 mm. Lenrh of areola IH mm. Breadth 

 of areola in the middle, 'r> mm. 



Mill Creek, Wabaunsee Co.; F. W. Cragin and J. B. Fields. 2 males 

 f. I., 1 female. 



This is the species mentioned, but not named, in my llevision of the 

 Astacidfie, page 94, under C propmqtnis. When that work was written I 

 had seen but three specimens of this crayfish, all of them second-form 

 males, without locality. I then forbore to present a complete description 

 of it. The collection of Messrs Cragin and Fields supplies the first-form 

 male and the female. In general appearance this species nearly resembles 

 (■. projtiiKjii Its, hut the .sexual appendages are ({uite different, resembling 

 those of C. rtisticHu, var. ^^/ac/J^.s. 



The tips of the fingers are orange-colored, preceded by a dark-colored 

 annular band. 



■"■'I'lu' I'eaboily AcMiU'iny specimens fi-Diu Ellis were collected some years ago 

 hv Dr. 1.. Watsoii. 



