86 VERNON L. KELLOGG. 



B Antennas similar in both sexes. 



C Meso- and metathoracic segments not fused Nesiotinus Kellogg. 



CC Meso- and metathoracic segments fused. 



D Front deeply angularly notched Akidoproctus Piaget. 



DD Front convex, truncate, or rarely with a curving emargination, 



but never angularly notched. 

 E Species broad and short, with large, movable trabeculae (at the 



anterior angle of antennal fossa). 



F Forehead with a broad transverse membranous flap pro- 

 jecting beyond lateral margins of the head in the male, 



barely projecting in the female Giebelia Kellogg. 



FF Without such membranous flap Docophorus Nitzsch. 



EE Species elongate, narrow, with very small or no trabeculos. 



Xirtnus Nitzsch. 

 BB Antennae differing in the two sexes. 



C Species wide, with body elongate-oval to suborbicular. 



D Temporal margins rounded ; last segment of abdomen roundly 

 emarginated ; antennae of male without appendage ; third seg- 

 ment very long Eurymetopus Taschenberg. 



DD Temporal margins usually angulated ; last segment of abdomen 



convex, rarely angularly emarginated, with two points. 

 E First segment of antennae of male large, sometimes with an ap- 

 pendage ; third segment always with an appendage. 



Goniodes Nitzsch. 



EE First segment of antenna of male enlarged, but always with- 

 out appendage ; third segment without appendage ; last 

 segment of abdomen always rounded behind. 



Goniocotcs Nitzsch. 

 CC Species elongated narrow, sides subparallel. 



D Third segment of antenna of male without an appendage. 



Ornithobius Denny. 

 DD Third segment of antenna of male with an appendage. 



E Front deeply angularly notched.. Bothriometopits Taschenburg. 

 EE Front not angularly notched. 



F Forehead with a broad transverse membranous flap or fold 

 projecting beyond lateral margins of the head. 



Philnteanus Kellogg. 

 FF Without such membranous flap. 



G Antennae and legs long; a semicircular oral fossa. 



Liptums Nitzsch. 



GG Antennae and legs short ; oral fossa narrow, elongate, 

 extending as a furrow to the anterior margin of the 

 head Oncophorits Rudow. 



ANALYTICAL KEY TO GENERA OF THE SUBORDER AMBLYCERA. 



A Tarsi with one claw ; infesting mammals (family Gyropidae) ... Gyropus Nitzsch. 

 AA Tarsi with two claws ; infesting birds (excepting Boopial) (family Liotheidae). 

 B Ocular emarigination distinct, more or less deep. 



C Forehead rounded, without lateral swelling ; antennae projecting beyond 

 border of the head Coipocephalum Nitzsch. 



