134 C. H. TYLER TOWNSEND. 



Synoptic table of the North American genera of 

 TACHINIDiE s.str. 



1. Scutellnm and abdomen, or at least the abdomen, armed with vigorous and 



more or less blunt spines (Hystriciinse) 2. 



Seutellum and abdomen with the usual bristles (macrochfetse) 10. 



2. Palpi as long as the elongated proboscis when horizontally exserted. extend- 



ing far beyond epistoma (except in D. rutiloides) Dejeaiiia R. D. 



Palpi notably shorter than proboscis (or proboscis not elongated), not ex- 

 tending half way beyond epistonui, sometimes rudimentary or wholly 

 absent 3. 



3. Eyes hairy 4. 



Eyes bare (or very sparsely hairy) (5, 



4. Palpi absent Crjptopalpiis Rdi. 



Palpi well developed 5. 



5. Sides of face bare: third antennal joint straight on front border. 



flysf ricia Mcq. 

 Sides of face hairy ; third antennal joint convex on front border. 



Pseudohysf ricia B. & B, 



6. Palpi rudimentary or absent Sauiidersia Sch. 



Palpi fully developed 7. 



7. Third joint of antennse but little longer than second 8. 



Third joint always considerably longer than second, linear 9. 



8. Third joint convex on front edge; arista normal Jnriiiia E. D. 



Third joint straight on front edge; arista short, atrophied. 



Ati*opliari<$ta Twns. 



9. Hind tibiae ciliate on outside; head not wide and swollen. 



Blepharipeza Mcq. 

 Hind tibise not ciliate: head very wide and swollen Belvosia E. D. 



10. Apical cell ending on front border of wing, very much or considerably before 



apex; seldom closed, and never long petiolate® (sometimes short petio- 



late) .- 11. 



Apical cell ending at apex of wing, or very little before it; or closed and 

 long petiolate 70, 



11. Facial ridges not ciliate, or at most bristly not more than half way up the 



face (Tachininse s. str.) 12. 



Facial ridges ciliate the greater part of their length from oral margin to base 

 of antenuse, .sometimes with very strong bristlesf (Phoroceratinse) ...58. 



12. Eyes nakedj 13. 



Eyes hairy (at least in the % ] 47, 



13. Apical cell open 14. 



Apical cell closed in margin, sometimes short petiolate 41, 



"•■■" If the petiole of apical cell ends well before tip of wing, it should he in- 

 cluded here. On the other hand some of the forms here included have the apical 

 cell well open and ending but little before wing tip; these belong principally in 

 Mnsicera, Exorista, Phorocera, etc. 



t The ciliate bristles must be on the facial ridges. The frontal bristles, when 

 these extend down on sides of face to the cheeks, must not be mistaken for them, 

 X The eyes are very faintly hairy in Meigenui ; almost naked in Labidigaster. 



