58 CALIFORNIA ACADEMY OF SCIENCES. 



pale median space between the occipital bands; occip- 

 ital bands much paler than the temporal borders, indis- 

 tinctly fading anteriorly into dark ocular blotches; 

 temporal margins narrowly bordered with dark brown; 

 occipital blotches distinct. 



Prothorax small, oblong; angles rounding, with one 

 long hair; lateral blotches distinct, separated by a pale 

 median line, darker along the posterior margin near 

 the angle, and fading gradually anteriorly. Metathorax 

 only two-thirds as wide as the head, with strongly 

 diverging sides, rounding, posterior angles; posterior 

 margin broadly rounded upon the abdomen; one very 

 short prickle and one long hair in a pale brown space 

 on the posterior angle; six long pustulated hairs on the 

 posterior margin; lateral markings little darker than 

 the general dark brown of the metathorax. 



Abdomen nearly circular; transverse, lateral blotches 

 distinct, acute inwardly, and darkest at the inner ends; 

 each bearing from one to four pustulated hairs; seg- 

 ment 8 entirely dark brown; segment 9 rounding, with 

 a narrow, angular emargination; one fine hair each side 

 of this emargination. 



Docophorus icterodes Nitzsch. (See Kellogg, New Mal- 



lophaga, I, 1896, p. 96, pi. iv, fig. 1). 



Specimens from a Lesser Scaup Duck, Aythya ajffinis, 

 and from an American Scaup Duck, Aythya marila 

 nearctica (Palo Alto, California). Previously taken by 

 Kellogg from the first named host species, and from six 

 other duck species. 



Docophorus fusiformis Denny. (Plate V, fig. 3). 



Monographia Auopluroruiu Britannije, 1842, p. 84, pi. i, fig. 2. 



Docophorus fusi/onnis D., Giebel, Insecta Epizoa, 1874, p. 104; Pia- 

 get, Les Pe'liculines, ISSO, p. 86, pi. vi, fig. 7. 



Docophorus fiss'iformis D., Osboru, Insects Affecting Domestic Ani- 

 mals, Bull. 5, N. S., Div. of Ent., U. S. Dept. Ag., 1896, p. 217. 



