BRACHELYTRA. 147 



BRACHELYTRA. 



A, Pro thoracic spiracles visible. 



a. Antennae inserted on npper surface of forehead, 

 near the inner, lower margin of the eye. 



Anterior coxae conical, prominent ; posterior coxae trans- 

 verse ; posterior trochanters elongate. Aleocharidae. 



h. Antennae inserted under the hinder part of side 

 margin of forehead. 



Anterior coxae conical, strongly prominent ; posterior 

 coxae obliquely quadrangular ; posterior trochanters elon- 

 gate. Tacliyporidae. 



c. Antennae inserted under apex of the side margin or 

 on the anterior margin of forehead, within or before 

 base of mandibles. 



Thorax with a lateral marginal line above and beneath. 

 Anterior coxae conical, prominent ; posterior trochanters ' 

 simple. Stapliylinidae. 



IB, Prothoracic spiracles hidden. 



a. Posterior coxae conical. 



J. Antennae inserted under the slightly raised side 

 margin of forehead at or near anterior angles. 



Anterior coxae conical, prominent, space behind them 

 usually membranous. Paederidae. 



II, Antennae inserted on the front of the forehead. 



Anterior coxae small, only moderately prominent ; space 

 behind them horny ; posterior trochanters simple. 



Stenidae. 

 h. Posterior coxae transverse. 



I. Antennae more or less elbowed. 



Antennae inserted under the raised side margin of fore- 

 head. Anterior coxae elongate, somewhat conical, promi- 

 nent, space behind them membranous ; posterior trochanters 

 simple ; second ventral abdominal segment even. 



Oxytelidae. 



II. Antennae not elbowed. 



Antennae inserted under the side margins of forehead ; 

 second ventral abdominal segment with a ridgelike 

 prominence in middle of base. 



L 2 



