t - 
7 Sor 
7. 
esol =v 
a _ 
> om 
on 
om 
~ e 
ws bey 
PLATE 3 
Mus. d’Hist. Nat., Paris. x1. 
o&. Type. Fall R., Fall City Mills, Cal, Au 
- 
Fig. 1.— Parastacus spinifrons (Philippi)? 
Fig. 2— Astacus nigrescens fortis Faxon. 
U.8.N. M. Slightly enlarged. 
