of the Pacific Shores of North America. 517 
ORCHESTIA PICKERINGII, Dana. 
Orchestia Pickeringii, Dana; U. S. Exploring Expedition, Crust. ii. 882, 
Pl. LIX. f. 9. Proc. Acad, Nat. Sci. Philad. VIL 177. 
California, (Le Conte.) 
Mus. Expl. Exped. 
ORCHESTIA TRASKIANA. Stimpson. 
Orchestia Traskiana, STrwrsox ; Proc. Cal. Acad. Nat. Sci. i. 90. 
Male, with the inferior antenne about one third as long 
as the body; the flagella forming more than half their 
length, and consisting of fourteen oblong joints; superior 
antenne reaching to the extremity of the second joint of 
the inferior ones. Feet of the first pair with a small hand 
With a produced lobe at the inferior angle, and a minute 
finger, as in O. littorea, pollicifera, etc. ; fourth joint and 
that preceding it, each with a small tooth below. Feet of 
the second pair with an ovate hand, with no teeth on the 
oblique, convex, spinous palm, which terminates posteriorly 
ma slight notch; finger about half as long as the hand, 
Smooth and much curved. In the female the first pair of 
hands resemble those of the male, except in being smaller, 
having less produced lobes, and a comparatively longer 
finger; those of the second pair with a small elongated 
hand, with a rounded extremity and a rudimentary finger 
applied at about the middle of the lower edge. In both, 
the feet of the sixth and seventh pairs are about equal in 
: Eyes rounded, black. Color, light gray, some- 
times greenish or brownish, always very pale. Length, 
three fifths of an inch. 
This Species has much resemblance to O. Pickeringii 
and o. Pugettensis, but is clearly distinct from both in the 
^ Wing characters. From the former, it. differs in the 
Sreater length and obliquity of the palm in the hand of the 
