124 Proceedings of Indiana Academy of Science. 
DD. Temporal margins usually angulated; last segment of 
abdomen convex, rarely angularly emarginated with two 
points. 
E. First segment of antenna of male large, sometimes with 
an appendage; third segment always with an appen- 
dage. Gonioces N. 
EE. First segment of antenna of male enlarged but 
always without appendage; third segment without 
appendage; last segment of abdomen always rounded 
behind. Goniocotes N. 
(CC. Species elongate, narrow, sides sub-parallel. 
D. Third segment of antenna of male without an appendage. 
Ornithobius Denny. 
DD. Third segment of antenna of male with an appendage. 
EK. Front deeply angularly notched. 
EE. Front not angularly notched. 
F. Antennae and legs long; a semicircular oral fossa. 
Lipeurus N. 
FF. Antennae and legs short; oral fossa narrow, 
elongate, extending as a furrow to the anterior 
Margin of the head. 
Onocophorus Rudow. 
Key to the Gerera of the Suborder Amblycera. 
A. Tarsi with 1 claw; infesting mammals (family Gryopidae). 
AA. Tarsi with 2 claws; infesting birds (except Boopia?) 
(family Liotheidae) 
B. Ocular emargination distinet, more or less deep. 
C.Forehead rounded, without lateral swelling; antennae projecting 
beyond border of the head. Colpocephalum N. 
CC. Forehead with strong lateral swellings. 
D. Antennae projecting beyond border of the head; temporal 
angles projecting rectangularly; eye large and simple. 
Boopia P. 
DD. Antennae concealed in groove on under side of head; 
temporal angles rounded, or slightly angular; eye divided 
by an emargination and fleck. 
EK. Mesothorax separated from metathorax by a suture. 
Trinoton N. 
EE. Meso- and metathorax fused; no suture. 
Laemobothrium N. 
BB. Ocular emargination absent or very slight. 
C. Sides of the head straight or slightly concave, with two small 
laterally-projecting labral lobes. Physostomum N. 
CC. Sides of the head sinous; forehead without labral lobes. 
D. Body very broad; metathorax shorter than prothorax. 
EKureum N. 
D. Body very broad; metathorax shorter than prothorax. 
Kureum N. 
