144 CALIFORNIA ACADEMY OF SCIENCES. 



row interrupted (by sutures) black marginal band, and 

 faint golden brown, broad, transverse bands darker on 

 posterior segments; last segment slowly tapering, broad 

 and flatly convex behind, with transparent margin and 

 fringe of fine sharp-pointed hairs. 



The specimen is probably not adult, and the markings 

 consequently less extensive than those of the adults. 



Colpocephalum pingue n. sp. (Plate xii, fig. 5.) 



Two males taken from one of the two specimens of the 

 Short-tailed Albatross, Diomedea albatrus, shot on the 

 Bay of Monterey, California. No Colpocefihahun has 

 hitherto been taken on an Albatross. 



Description of male. Body, length 1.7 mm., width .62 

 mm. ; short, broad, fuscous, with dark brown abdominal 

 transverse bands, paler medially. 



Head, length .28 mm., width .5 mm.; but little more 

 than half as long as wide; front flatly rounding, with, on 

 each side of the middle which is marked by a minute 

 angular process, a short weak hair, a longer stiff spiny 

 hair, then another similar one (adjacent to the projecting 

 palpus), and on the lateral angle in front of the ocular 

 emargination four hairs, of which two are the longest of 

 the forehead hairs; the palpus and antenna projecting 

 beyond margin, each by its last segment; the eye large, 

 simple, filling the base of the ocular emargination and 

 containing a distinct, divided, black fleck; the ocular 

 fringe of hairs extending only to the posterior limit of the 

 emargination ; the temporal margin convex and with eight 

 hairs of which three are long; occipital margin weakly 

 concave with two hairs on each side of the middle. Color 

 of head fuscous with a narrow black occipital margin ex- 

 panded at the bases of the faintly discernible occipital 

 bands; the ocular blotches large, black, extending along 



