PLATE 9. 



Fig. I.— Parastacus spiiiifrons (Pliilippi)? Mus. d'Hist. Nat., Paris. X 1. 



Fig. •I.— Astacus iiigrescens fortis Faxon. cT. Type. Fall R., Fall City Mills, Cal., Aug. 29, 1S98. 

 U. S. N. M. Slightly enlarged. 



