38 CALIFORNIA ACADEMY OF SCIENCES. 



cone-shaped median blotch on mesothorax, and a large, 

 broadly diamond-shaped, median blotch on metathorax; 

 intercoxal lines between pro- and mesothorax distinct. 

 Abdomen elongate-elliptical; segments with a single 

 long weak hair and some short ones in posterior angles, 

 and some short ones along lateral margins; a single 

 transverse series of not very closely set weak hairs along 

 posterior margin of each segment; general color light 

 smoky brown with very narrow blackish lateral bands; 

 last segment parabolic behind, with short hairs, and at 

 each side a few longish hairs. 



Colpocephalum spineum n. sp. (Plate IV, fig. i). 



A single male from a Man o'War Bird, Fregata aquiia 

 (Panama). Piaget has taken a small Colpocephaluvi from 

 Fregata 7ainor {angulaticeps, Les Pediculines, p. 569, 

 pi. xlvii, fig. 8), to which this new form must show some 

 resemblance in size and characteristic quadrangular 

 shape of forehead; but the shape of the abdomen, not 

 at all elliptical as described for angulaticeps, bat elon- 

 gate-oblong with nearly parallel sides, and the distinct 

 and characteristic abdominal markings and lateral hairs 

 of the prothorax, serve to make any reference of my 

 specimen to angulaticeps impossible. 



Description of male. Body, length 1.53 mm., width 

 .44 mm.; elongate, narrow, with subparallel sides; pale 

 golden brown with large dark brown head blotches and 

 lateral brown blotches on abdomen. 



Head, length .34 mm., width .47 mm.; forehead 

 nearly quadrangular, with a few short hairs along the 

 front and four short ones and two longish ones on sides; 

 palpi and antennte slightly projecting beyond the mar- 

 gin of the head; temples broad with flatly convex lat- 



