DESCEIPTION OF TWO NEW SPECIES OF CRAYFISH. 



By W. r. Hay, M. S., 



Central High School, Washbujton, 1). C. 



deeply excavated, 

 lateral teeth well 



In working over the Inrge collection of the Astacidte in tlie posses- 

 sion of the U. S. National Mnseum the following new species have come 

 to my notice : 



CAMBARUS PILOSUS. 



Type locality. — Beloit, Mitchell County, Kansas. 



Type.— 1^0. 197G1, U.S.N.M. 



Male, form I, not known. 



Male, form II, rostrum of medium width, long, 

 with sharp, raised, slightly converging margins; 

 developed, acute; acumen loug, slender, acute, nearly straight. Post- 

 orbital ridges grooved on their outer face ; anterior spines small, acute. 

 Carapace smootk and lightly 

 punctate above, very finely 

 granulate on the sides; anterior 

 border not angulated and with 

 a. well-developed fringe of cilia 



extending along the lower side /\ / \ ^^ — — 2 



of the rostrum and around 



beyond the minute branchi- 



ostegian spine ; cervical groove \ A I ll\ 1 1 \\ 3 



deep, sinuate, broken on the 



sides above the small lateral 



spine; areola narrow. Abdo- 



1 i.v J.T, 11 Fl'i- 1.— NOS. 1, 2, CARAPACE: No. 3, ANTENNAL SCALE; 



men longer than the cephalo- no. 4. first abdominal appendages of male, form n. 

 thorax, telson rounded behind, 



anterior segment with two spines on each side of the posterior border. 

 Second and third basal segments of the antcnnsie with well-developed, 

 acute, external spines. Antennal scale a little longer than the rostrum, 

 outer margin slightly concave, apical spine acute and rather long; tip 

 concave, inner margin rounded. Epistoma subtriangular, the margins 

 convex. Third maxillipeds hairy on their inner and outer faces. Cheli- 

 peds short; chelae of moderate width, punctate above, nearly smooth 



Proceedings U. S. National Museum, Vol. XXII— No. 1 187. 



121 



