NEW MALLOPHAGA. 6l 



not definitely answered by the key. In introducing into 

 the key the genera which have been described since the 

 making of the key used in the European monographs, I 

 find naturally increasing difficulties ; so I have accompa- 

 nied the key with a synopsis of all of the described gen- 

 era, calling attention to the characters which go to give 

 any genus its peculiarly characteristic appearance. With 

 the key and the diagnosis I hope that any genus can be 

 satisfactorily determined. For definitions of the terms 

 used in referring to various structures of the Mallophaga, 

 see the Terminology, following the synopsis. 



KEY TO THE SUBORDERS. 

 A. With filiform 3- or 5-segruented antennae, and no labial palpi. 



Suborder Lschnocera. 

 AA. With clavate or capitate 4-segmented antenna?, and 4-segmented 

 labial palpi. ^Suborder Amblycera. 



KEY TO THE GENERA OF THE SUBORDER ISCHNOCERA. 



A. With 3-segmented antenna 1 ; tarsi with 1 claw; infesting mammals 



(family Trichodectidss). Trichodectes N. 



AA. With 5-segmented antenna?; tarsi with 2 claws; infesting birds 

 (family Philopterida?)- 

 B. Antenna similar in both sexes. 



C. Front deeply angularly notched. Akidoproctus P. 



CC. Front convex, truncate, or rarely with a curving emargina- 

 tion, but never angularly notched. 



D. Species broad and short, with large movable trabecule (at 

 the anterior angle of antennary fossa). 

 E. Forehead with a broad transverse membranous flap 

 projecting beyond lateral margins of the head in the 

 male, barely projecting in female. 



Giebelia Kellogg. 

 EE. Without such membranous flap. 



Docofhorus N. 

 DD. Species elongate, narrow; with very small or no 

 trabecular. Nirmus N. 



BB. Antenna? differing in the two sexes. 



C. Species wide, with body elongate-ovate to sub-orbicular. 



D. Temporal margins rounded; last segment of abdomen 

 roundly emarginated; antenna? of male without append- 

 age, third segment very long. Eurymetopus Tasch. 



