NEW MALLOPHAGA, 



71 



from tawny to blackish brown on a whitish ground. 

 Found on birds of prey, and certain water birds. 



Genus Physostomum Nitzsch. Species large, from 2^ 

 to 5 mm. long; body elongate; head broadly conical, 

 straight or a little concave on the lateral margins, without 

 ocular emarginations; broad and usually truncate or flatly 

 convex in front; temporal corners angulated; the under 

 side of the forehead with two small motile muscular lobes 

 projecting slightly beyond the lateral margins, character- 

 istic marks of the genus; palpi prominent; antennae very 

 short, always concealed in their furrows ; thorax longer 

 than the long head; meso- and metathorax completely 

 fused, the posterior width of the metathorax same as an- 

 terior width of first segment of abdomen; legs robust, 

 little colored and with few hairs; first segment of tarsus 

 with a small double lobe ; second segment rather short. 

 Abdomen elongate elliptical, ninth segment broad and 

 rounded. Color clear pale brown to yellowish, abdomen 

 with lateral bands. The species are few and have been 

 found as yet exclusively on passerine birds. 



Genus Eureum Nitzsch. Body large, head and abdo- 

 men very wide, and metathorax very short; head without 

 ocular emargination and with temples very much enlarged 

 and rounded; antennse concealed in their cavities; the 

 palpi never projecting beyond lateral margins of the head; 

 thorax about same length as the head; prothorax con- 

 cave before and behind; the shorter metathorax of the 

 same form as first segment of abdomen; legs long, sec- 

 ond segment of tarsus very long; abdomen with acute 

 posterior angles of segments, and hairy. But two species 

 are known, one found on a swallow and the other on the 

 chimney swift. 



Genus Nitzschia Denny. Body of medium size, about 

 2 mm. long; head with small ocular emargination, and a 



