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 than 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 coxa) with 

 very long lobe-like appendages. 



Ancistkona Westwood. 

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

 ages of hind-head. Mknopox N. 



Synopsis of Mallophaga. 

 Suborder ISCHNOCERA. 

 With the antenna 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^e. 



Infesting birds; tarsi with two claws; antennae 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 Docofl/writs 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 



