VO i889. n '] PROCEEDINGS OF THE NATIONAL MUSEUM. 629 



spine is much smaller, and the hand more inflated and triangular ; the 

 cephaiathorax is slenderer, the antennae longer ; the male appendages 

 are very similar to those of the typical form, but the free tips are a 

 little longer and slenderer. In the smoothness of the carapace and, 

 to some extent, in the shape of the hand this form approaches G. sloanii 

 Buudy, but the male organs and the annulus ventralis are very nearly 

 like those of the typical G. affinis. I prefer to call it a western variety 

 of G. affinis. The largest is 60 mm in length. The specimens from Lake 

 Erie referred to G. affinis in my Revision are too small to determine 

 with certainty. 



Cambarus propinquus Gir. 



Additional localities : Marshall, Michigan ; St. Mary's Lake, mouth 

 of Battle Creek, Michigan ; Kalamazoo River, Michigan, C. H. Boll- 

 man (U. S. F. 0.) ; Lafayette, Indiana, H. L. Osborn (M. 0. Z.). 



Cambarus neglectus Fax. 



Cambarus neglectus Faxon, Bull. Washburn Coll. Lab. Nat. Hist., Topeka, Kan- 

 sas, Vol. i, 1835, p. 142. 



Male, form I. — Rostrum broad, slightly excavated, with a median 

 longitudinal carina toward the apex ; sides nearly parallel from the 

 base to the lateral spines, which are very small and of a brown color ; 

 acumen of moderate length. Post-orbital ridges with very small an- 

 terior spines (sometimes none). Carapace oval, flattened above, puuc- 

 tate, lightly granulate on the sides, lateral spine minute or obsolete 

 antero-lateral border augulated below the eye; anterior segment equals, 

 at the most, twice the length of the posterior segment ; areola of mod- 

 erate width. Abdomen longer than the cephalothorax ; basal segment 

 of the telson bi-spinous on each side of the posterior margin. An- 

 tennae shorter than the body ; lamina as long as the rostrum, broadest 

 toward the distal end, apical spine of moderate length. Anterior pro- 

 cess of the epistoma long, subtruncate. Third maxillipeds hairy within, 

 naked below. Chelipeds short; chela broad, punctate above and 

 below, inner margin furnished with a double row of depressed tuber- 

 cles ; fingers of moderate length, more or less gaping at the base, with 

 a row of round tubercles on their opposed edges, outer margin of the 

 movable finger also furnished with low tubercles ; carpus broad, punc- 

 tate above, with a strong median spine on the internal side and a small 

 one near the base, no spines on the lower side. Superior border of 

 meros armed with two obliquely-placed anteapical spines, lower face of 

 meros with two rows of spines. Third pa'r of legs hooked. First pair 

 of abdominal appendages nearly straight, reaching forward to the first 

 pair of legs, terminating in two long, slender, pointed, horny styles ; 

 the anterior style (outer part of the appendage) is a little longer than 

 the posterior and slightly recurved ; anterior border of the appendage 

 carinate but not shouldered. 



