io8 



KANSAS UNIVERSITY QUARTERLY. 



To sum up, the differences between Apiocera and the Asilidae may 

 be expressed as follows: 



APIOCERA. 



Front narrowed in the male. 



Front not excavated. 



Front without bristles. 



Face very short, without mystax. 



Eye-facets never enlarged in 

 front. 



Paraglossae longer than ligula, 

 deeply channeled. 



ASILIDAE. 



Front of equal width in both 

 sexes. 



Front excavated between the 

 eyes. 



Front with bristles. 



Face descending below the 

 eyes, usually with mystax. 



Eye-facets usually enlarged in 

 front. 



Paraglossae very short, much 

 shorter than the ligula, gently 

 concave. 



Ligula a slender semi-cylindri- 

 cal channel, fitting for its whole 



Ligula stout, covered at base 



by the paraglossae, elsewhere 



length in the paraglossae, wholly fo,n,ing a closed tube, uncovered 



without hairs. -u ..i, i j -u i i 



by the paraglossae, and withback- 



wardly directed short bristly hairs 

 along its upper margin. 



Palpifers stout, lanceolate. 



Labella horny, immovable, 

 wholly without pseudo-tracheae. 



Neuration very constant in re- 

 lated species. 



The presence of the anterior 

 branch of the third vein hitherto 

 recognized as a family character. 



The fourth vein always ter- 

 minates beyond the tip of the 



Palpifers slender, cylindrical. 



Labella broad, movable, with 

 pseudo-tracheae. 



Neuration very variable in re- 

 lated species. 



Anterior branch of the third vein 

 sometimes wanting. 



The fourth vein always termi- 

 nates before the tip of the wing. 



Legs not strong. 



Trichostical bristles wanting. 

 Flower-flies. 



Legs strong, adapted for grasp- 



ing. 



Trichostical bristles present. 

 Predaceous flies. 



In nearly all these respects Apiocera agrees with the Mydaidae. 

 Apiocera differs from the Mydaidae as follows: 



