194 CALIFORNIA ACADEMY OF SCIENCES. 



cided. The extremities are alternately colored light and 

 dark. The cuticula is covered with a network of rather 

 thick chitinous bars, the disposition of which is repre- 

 sented in the adjoined drawing. Within the meshes there 

 are figures of the same appearance as in the preceding 

 species. The groups of hairs on the particular tergits 

 are disposed like the rows of elevations of the preceding 

 species and seem to consist of chitinous bars, bifid at the 

 end and hairs, of which some are feather-like and others 

 naked. The number of hairs in each group seems to be 

 nine. 



As to the integument of hairs it must be added that 

 groups of fine setee are hanging down from the posterior 

 margin of the telson, and that the cerci are richly cov- 

 ered with hairs. Unfortunately I have had only two in- 

 dividuals of this species at my disposal and one of them 

 has been given up to the dissecting needle. 



Habitat. San Francisco, California. (Coll. G. Eisen.) 



