ASILID^E. 59 



ASILI1SLE. 



1. Bristle of antennae plumose. . . . OMMATIUS Wiedemann. 

 Bristle not plumose. ..... .-> . .. . . 2 



2. The veins closing the discal and fourth posterior cells in the same 



straight line or parallel (Central, S. America). ATRACTIA Macquart. 

 The veins closing the discal and fourth posterior cells not parallel. 3 



3. The posterior branch of the third vein curves forward to meet the costa 



before the tip of the wing. ...... '. . . 4 



The' posterior branch of the third vein terminates beyond the tip of the 

 wing - 5 



4. Oviduct cylindrical, with a terminal circlet of spines. 



PROCTACANTHUS Macquart. 

 Oviduct laterally flattened, without circlet of spines. ERAX Macquart. 



5. Two submarginal cells (Asilus sens. lat). ..... 7 



Three submarginal cells. 6 



6. Abdomen shorter than the wings; body thickly pilose, claws obtuse. 



MALLOPHORA Macquart. 

 Abdomen longer than the wings ; body thinly pilose. PROMACHUS Loew. 



7. Oviduct laterally compressed. . ! . . . . . . 8 



Oviduct conical. 



8. Face without gibbosity, narrow throughout, not at all carinate, the 



mystax composed of a few long hairs. STENOPROSOPUS Loew. 



Face with gibbosity, or not carinate or unusually narrow. . . 9 



9. End lamellae of the oviduct wedged in. . . EUTOLMUS Loew. 

 End lamellae free, style-like. . .. .- ; , . . . .10 



10. Posterior border of the last ventral segment in the $ more or less 



widened . . MACHIMDS Loew. 



Posterior border ( $ ) not widened. 11 



11. Legs prevailing shining yellow in color. . HELIGMONEUKA Bigot. 

 Legs prevailing black, or light and opaque colored. ... 12 



12. Abdomen shining black above and below. - STILPNOG ASTER Loew. 

 Abdomen not shining above and below. ... - . 13 



13. Male genitalia club-like NEOITAMUS Loew. 



Male genitalia not club-like; the sixth and seventh segments take no 



part in the formation of the oviduct. . . . TOLMERUS. 



14. Abdominal segments with bristles before the incisures. 



PHILODICUS Loew. 

 Abdominal segments without bristles before the incisures. . . 15 



15. Bright colored large species. ' . .".'-. . . ASILUS Linne. 

 Small, ash-gray species. . . . . . RHADIURGUS Loew. 



