NEW MALLOPHAGA. 63 



CC. Sides of the head sinuous; forehead without labial lobes. 

 D. Body very broad; metathorax shorter than prothorax. 



Eureum N. 

 DD. Body elongate; prothorax shorter thau metathorax. 



E. Ocular emargination filled by a strong swelling; 

 sternal markings forming a quadrilateral without 

 median blotches. Nitzschia Denny. 



EE. Ocular emargination without swelling, hardly ap- 

 parent or entirely lacking; median blotches on 

 sternum. 



F. Very large; with two 2-pointed appendages on 

 ventral aspect of hind-head; anterior coxre with 

 very long lobe-like appendages. 



Ancistroxa Westwood. 

 FF. Small or medium; without bi-partite append- 

 ages of hind-head. Meisopox N. 



Sy NO PS IS OF Mallophaga. 

 Suborder ISCHNOCERA. 

 With the antennae filiform, 3- to 5-segmented, sometimes 

 differing in the sexes; no labial palpi. 



Family Trichodectid^e. 



Characters of the single genus. 



Genus Trichodectes. Infesting mammals; tarsi with 

 one claw; antennae 3-segmented, in some species differ- 

 ing in the sexes ; legs thickly beset with hairs; female 

 with a pair of bent appendages on the sides or ventral 

 surface of the eighth abdominal segment. 



Family Philopterid^;. 



Infesting birds; tarsi with two claws; antennas 5-seg- 

 mented, not lying in an excavation on the under side of 

 the head, but always projecting far beyond the sides of 

 the head. 



Genus Docojyhorus Nitzsch. (Plates iii and iv.) Body 

 short and broad, head usually as wide across the tem- 

 ples as long, front broadly truncate or convex or slightly 

 concave, rarely with a curving emargination; clypeus 



