494 Stimpson on the Crustacea and Echinodermata 



This species was found abundantly near Astoria by- 

 Lieut. Trowbridge. It occurs sometimes in brackish water, 

 as I am informed by Dr. Cooper. 



Mus. Bost. Soc. ; Smithsonian ; Paris ; Acad. Petrop. 



ASTACUS KLAMATHENSIS. Stimpson. 

 Astacus Klamathensis, Stimpson ; Proc. Bost. Soc. Nat. Hist. vi. 87. 



A small species with a smooth carapax ; thorax some- 

 what contracted in front. Thoracic spines of the anterior 

 pair very small ; those of the posterior pair obsolete. Ros- 

 trum small ; margins smooth, converging ; antero-lateral 

 teeth sufficiently distinct ; terminal tooth short. Dorsal 

 area broad. Anterior feet with rather small, smoothish 

 hands ; inferior edge of arm less strongly dentated than in 

 the other species. Sides of the abdominal segments broadly 

 rounded, scarcely at all angular at the middle. The minute 

 lateral spines of the ^caudal segment are rather short and 

 stout. Color, in preserved specimens, yellowish-white, clear 

 and bright ; hand slightly tinted with olive or bluish. The 

 dimensions of a female specimen are as follows : — 



Length of body 3.00 inches 



" carapax 1.38 " 



" rostrum .29 " 



" terminal tooth of rostrum . . . . .10 " 

 " hand 90 " 



Breadth of " 40 " 



It may be distinguished from the preceding species by 

 its lighter color, shorter and somewhat tapering rostrum, 

 less developed spines, and smaller hands. It was found in 

 Klamath Lake by Dr. Newberry. 



Mus. Smithsonian 



