28 CALIFORNIA ACADEMY OF SCIENCES. 



Abdomen, fourth segment widest; segments of about 

 equal length; posterior angles with few weak, not long, 

 hairs; color whitish, with very narrow, clear lateral 

 margin which sends expanded processes inward, three 

 in each segment; the foremost of the three is the small- 

 est and is contiguous to the suture; the hinder two are 

 covered by two triangular blackish blotches which on 

 some segments are contiguous, on others distinctly sep- 

 arate; segments 8 and 9 narrow, colored laterally; pos- 

 terior margin of segment 9 truncate, with a very small 

 angular einargination; two short hairs on each of the 

 blunt points. 



Lipeurus densus Kellogg. (Plate III, fig. 2). 



New Mallophaga, I, 1896, p. 114, pi. vii, figs. 1 aud 2. 



A single male from a Black-footed Albatross, Diomedea 

 nigripes (North Pacific Ocean, off Alaska). This speci- 

 men is a full millimeter longer and is much more com- 

 pletely blotched with dark brown than the original type 

 specimen, a female; but I think they are of the same 

 species. The female described is undoubtedly not fully 

 grown and colored. While the antennae vary in the 

 sexes, that of the male bears no projection: it is simply 

 heavier and larger, with its first segment largest; in the 

 female, segment 3 is the longest. It is a male of this 

 species, probably, which Taschenberg (Die Mallophagen, 

 1882, p. 145, pi. V, fig. la) describes and figures as the 

 female of ferox. 



Description of male. Body, length 5.8 mm., width 

 1.25 mm.; ground color very pale brown, but body 

 mostly covered by large, dark brown blotches, head and 

 thorax slightly longer than abdomen. 



Head, length 1.3 mm., width 1,06 mm,; front para- 

 bolic, with a group of three distinct hairs at each side 



