I42 CALIFORNIA ACADEMY OF SCIENCES. 



flatly rounded behind, posterior margin with several long- 

 ish hairs; lateral ends of segments dark brown (dark re- 

 gion quadrangular) and a paler, transverse band running 

 clear across each segment and covering all of its surface, 

 paler in its median portion; sutures paler to uncolored. 



Female, length 2.19 mm., width .62 mm.; abdomen 

 rather fusiform in shape, segment 2 the widest; segment 

 9 elongate, tapering, with a series of six short, strong, 

 recurved hooks on the front half of each lateral margin ; 

 posterior margin broadly obtusely angled and thickly 

 beset with stiff hairs; from the middle of each lateral 

 segmental margin arises a pair of long hairs; the lateral 

 margins of the abdomen are darker, black in some spec- 

 imens, than in the male. 



An immature specimen, 1.56 mm. long, showed as' its 

 only markings the ocular blotches, the anterior ends of 

 the inner bands and a short linear marking on occipital 

 margin; all of these markings were distinct and black. 



Colpocephalum uniforme n. sp. (Plate xii, fig. 4.) 



A single female taken from an American Avocet, Recur- 

 z'irostra americana (Lawrence, Kansas). This species 

 closely resembles grandicefs Piaget (Les Pediculines, p. 

 558, pi. xlvi, fig. 7), taken on Hcematopus ostralegus, but 

 differs from it in the number and arrangement of the long 

 hairs on the head, thorax and last abdominal segment, 

 and in the markings. 



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

 .75 mm.; elongate, pale golden brown, with very little 

 darker markings; the small ocular blotches, occipital 

 margin, and narrow lateral margin of metathorax and 

 abdomen black. 



Head, length .4 mm., width .6 mm.; ocular emargina- 

 tion less deep than usual; front rounded, almost a semi- 



