62 CALIFORNIA ACADEMY OF SCIENCES. 



DD. Temporal margins usually angulated; last segment of 

 abdomen convex, rarely angularly einarginated with two 

 points. 



E. First segment of antenna of male large, sometimes 

 with an appendage; third segment always with an 

 appendage. Goxiodes 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, nanow, sides sub-parallel. 



D. Third segment of antenna of male without an append- 

 age. Orxithobius Denny. 

 DD. Third segment of antenna of male with an appendage. 

 E. Front deeply angularly notched. 



Bothriometopus Tasch. 

 EE. Front not angularly notched. 



F. Antennas 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. Oncophorus Rudow. 



KEY TO THE GENERA OF THE SUBORDER AMBLYCERA. 



A. Tarsi with 1 claw; infesting mammals (family Gyropidaa). 



Gyropus N. 

 AA. Tarsi with 2 claws; infesting birds (except Boopia?) (Family 

 Liotheidas.) 

 B. Ocular emargination distinct, more or less deep. 



C. Forehead rounded, without lateral swelling; antennas pro- 

 jecting beyond border of the head. Colpocephalum N. 

 CC. Forehead with strong lateral swellings. 



D. Antennas 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 the 

 head; temporal angles rounded, or slightly angular; eye 

 divided by an emargination and fleck. 

 E. Mesothorax separated from metathorax by a suture. 



Trixotox N. 

 EE. M.eso- and metathorax fused; no suture. 



Ljsmobothrium 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. 



