oiuuKSTii)>:. 49 



The specimen is preserved in the Musciun of the North Pacific 

 Expedition. 



2(5. Allorchestes plumulosus. 

 Allorchestes phunulosiis, .S'ifw^yj.v"//, Jonni. Bost. Sue. Nat. Hist. vul. vi. 



'• Tn this species the inferior antennae are about one-third as long 

 U.S the body, and thickly tufted with plumose hairs alonjij the infcricn* 

 edge, — tlie terminal joint of the peduncle, and all tlic Joiiils of the 

 articulate flagellum, except those near the extremity, being provided 

 below with plume-like bundles of branching setae, as well as the 

 usual simple ones above and on the sides. The superior antennae 

 have only a few simple seta;, which are, however, of considerable 

 length. The propodos of the second pair of gnathopoda is oblong, 

 two-thirds as broad as long, and rather quadrate than ovate, with 

 the palm ciuwed, less excavated, and with a much less prominent 

 projection at the extremity of the dactylos than in A. seminwlus; 

 the dactylos is scarcely half as long as the propodos. In other cha- 

 racter this species has considerable resemblance to A. seminudus. 

 Colour- greenish. 



" Length -^^ths of an inch. 



•' It is comnion on gravelly shores in the littoral zone, near the 

 month of San Francisco Bay. 



•• Mas. North Pacific Expedition." — Stimpson. 



27. Allorchestes angustus. 



Allorchestes angustus, Dana, Proc. Acad. Nat. Sc. Philad. 1854, vii. 

 177 ; Stimpson, Journ. Bost. Sac. Nat. Hist. vol. vi. 



Stimpson says, " This species may be recognized by its high coxae." 



Hah. California (Le Conte). 

 Mns. of Prof. Dana, 



28. Allorchestes rubricornis. 



Allorchestes rubricornis, Stiinp.s<»i, Exped. China and Japan, Proc. 

 Acad. Nat. Sci. Amer. 1855. 



"Smooth, compressed. Eyes suboval, black, widening below. Inferior 

 antennae two-thirds the length of the body, ^vith 25-articulate fla- 

 gella, articulations nearly as broad as long, with a few short hairs. 

 Superior antennae two-thii-ds as long as the inferior ones, flagella 

 13-articulate. Large propodos of male nearly smooth below. 

 Gnathopoda of female slender, with dactyla one-fourth their length. 

 Posterior pair of pleopoda conical. Colour pale olive ; antennae 

 always red. 



" Length ^rds of an inch. 



"Hah. Ousima, Boninsima." — Stimpson. 



£ 



