PLATE 9. 



Fig. 1. — Parastaciis sjnnifrons (Philippi)? Mus. d'Hist. Nat,., Paris. X 1. 



Fig. 2.— Astacus n-igrescens fortis Faxon. cT. T}'pe. Fall R., Fall City Mills, Cal., Aug. 29, 1898. 

 U. S. N. M. SUghtly enlarged. 



