134 CALIFORNIA ACADEMY OF SCIENCES. 



angles and margin of metathorax instead of two, and by 

 the absence of an uncolored median abdominal line. The 

 new species b}^ the character of the antennae of the male 

 belongs to the group docophoroides. 



The genus Oncophorus was established by Rudow 

 (Zeitschr. f. ges. Naturwiss., 1870, vol. xxxv, p. 175) 

 for his Oncop/iorus schillingi since removed by Taschen- 

 berg to his genus Eurynietopus. Piaget has preserved 

 the generic name Onco-phorus but applies it to a group of 

 widely removed JVzrmus-lihe small forms. Eight species 

 have been described, of which seven are found on wading 

 birds. Piaget says of the genus that it serves as a nat- 

 ural transition between the genera Docophorus and Nir- 

 mus on one side, and Goniodes and Lrpeurus on the 

 other. 



Description of the male. Body, length 1.15 mm., 

 width .4 mm.; small, pale with dark brown lateral ab- 

 dominal bands on all except last three abdominal seg- 

 ments. 



Head, length .34 mm., w r idth .32 mm.; front parabolic 

 with a few short hairs rising from the dorsal surface on 

 each side of the middle of the front projecting over the 

 margin ; trabecular short, wide at base appearing equilat- 

 erally triangular in shape; antennae with first segment 

 much enlarged, third segment with a distinct appendage, 

 fourth shorter than fifth; eye at about middle of the head, 

 flatly convex with a hair; temporal margins straight, di- 

 verging posteriori}' with three short spiny hairs; in the 

 posterior angles a very long strong hair, reaching to the 

 posterior margin of the first abdominal segment; just be- 

 hind this hair a spine, and on the occipital margin two 

 short, strong, spiny hairs inserted even with the lateral 

 margins of the prothorax; occipital margin sinuous; 

 color, pale golden; antennal and ocular bands dark, sub- 

 translucent and curving. 



