48 CALIFORNIA ACADEMY OF SCIENCES. 



transverse blotch entirely across segment darker. Legs 

 eoncolorous with the pale ground color of the body, 

 with very narrow darker dorsal margining. Sternal 

 markings consisting of a narrow transversal median 

 blotch on presternum, and intercoxal lines curving back- 

 ward at inner ends on mesosternum. 



Abdomen rather short and broad, ovate; posterior 

 angles projecting but slightly and bearing two to three 

 long hairs; on the lateral margins of each segment a 

 spine; a transverse series of hairs across each segment 

 near its posterior margin; ground color very pale yel- 

 lowish brown, with a chestnut-brown transverse band 

 entirely across each segment except the ninth; poste- 

 rior margin of segment 9 flatly angulated and with a 

 close fringe of hairs. 



Male. Body, length 1.34 mm., width .6 mm.; head, 

 length .25 mm., width .53 mm.; the few specimens of 

 males in the lot taken from the single bird examined 

 are paler in color than the females; the transverse 

 band of the eighth abdominal segment is hardly notice- 

 able; segment 9 flatly rounded behind, with a few prom- 

 inent hairs. 



Physostomum. 



With regard to the characters used in distiguishing 

 species in this genus I am in much doubt. I believe 

 that the genus is not at all well undertsood and that 

 the specific deterininations including my own (see New 

 Mallophaga II, 1896, p. 513, et. seq.) need a thorough 

 revision. This revision cannot, however, be under- 

 taken until much more material is in hand. I describe 

 the. two following species with this doubt in mind, sim- 

 ply giving here as best I can additonal data, for the 



