120 INSECUTOR INSCITI^ MENSTRUUS 



"Pile on the posterior antecoxal piece." The posterior ante- 

 coxal piece is that part of the venter of the thorax between the 

 middle and the hind coxae. It is pilose in the Chilosini, Api- 

 comyia, Myiolepta nigra, Rhingia, Perdinandea, Callicera, 

 Psilota, and Pipizini. It is bare in Bumyiolepta, Myiolepta 

 varipes, Chalcomyia, Hammer schmidtia, Brachyopa, Peleco- 

 cerini, Sphegini and apparently all the species of Chrysogaster. 

 Thus this character is, as in Xylotinae, usually only of specific 

 importance. 



The Chilosinae may be circumscribed by their pilose humeral 

 calli (i. e., pile on the humeri as long as elsewhere on meso- 

 notum) ; males always with four visible tergites (exclusive of 

 the hypopygium) ; discal cross-vein placed before middle of 

 discal cell; costal vein ending at or beyond apex of wing; 

 third antennal joint with dorsal arista except Callicera and 

 Pelecocera. 



Key to the Genera oe Chilosinae with Tuberculate Face 



1. Antennae very elongate with terminal style Callicera 



Antennae with dorsal arista 2 



2. Discal cross-vein at or beyond middle of discal cell ; general 



color brassy Perdinandea 



Discal cross-vein before middle of discal cell 3 



3. General color ferruginous ; thorax, legs and abdomen with 



bristles Hammerschmidtia 



General color dark 4 



4. Petiole beyond union of third and fourth veins as long as length 



of discal cross-vein 5 



Petiole beyond third and fourth veins much shorter 7 



5. Eyes hairy ; antennal pits separated Chilosia 



Eyes bare ; antennal pits confluent 6 



6. Face bare; both sexes with prominent facial tubercle. . .Cartosyrphus 

 Face with pile ; males only with tubercle which is very 



small Chrysogaster (in part ) 



7. Pile modified, scale-like Bumyiolepta 



Pile normal 8 



8. Posterior femur with a saw-tooth projection on outer, apical 



end Apicomyia. n. gen., type Myiolepta bella Will. 



Posterior femora without such structure Myiolepta 



