36 CALIFORNIA ACADEMY OF SCIENCES. 



Colpocephalum. 



Colpocephalum abbotti n. sp. (Plate IV, fig. 9). 



Taken from a gull, Larus sp. (Baja California). This 

 new form is of the general type of fuscipes Piaget (Les 

 Pediculines, p. 567, pi. xlvii, fig. 7) from Larus domin- 

 icanus, and of funebre Kellogg (New Mallophaga, I, 

 p. 147, pi. xii, fig. 7) from Larus glaucescens (Bay of 

 Monterey). It most nearly in general aspect, and espec- 

 ially in the branching, uncolored median line of abdo- 

 men, thorax, and head, resembles sulcatum Piaget (Les 

 Pediculines, p. 565, pi. xlvii, fig. 5) from 8terna nigra, 

 but is one-half larger, and has transverse series of hairs 

 on the dorsal aspect of the abdomen, while sulcatum is 

 here naked. 



Description of female. Body, length 2.34 mm., width 

 .88 mm.; rather large, long abdomen; abdomen sombre 

 in color with narrow, black, lateral borders on hind 

 head, thorax, and abdomen; a conspicuous, uncolored, 

 median line on first five segments of abdomen, all of 

 thorax, and hind head, the line dividing in the head 

 and sending a branch to each lateral margin just in 

 front of the ocular emargination. 



Head, length .47 mm., width .7 mm.; front broad, 

 very flatly convex, with numerous hairs of which four 

 are longer than the others; on the lateral margins of 

 the forehead in front of the ocular emargination a very 

 long hair, with another shorter one close to it, and two 

 in the angle; the palpi projecting beyond the lateral 

 margins of the head; the ocular emargination deep, 

 angular, with a prominent fringe and a longish hair 

 rising just inward of the double eye; temples rather 

 narrow, projecting, with four long hairs on the mar- 

 gin and one rising at some distance inward from the 



