320 



UNITED STATES NATIONAL MUSEUM BULLETIN 224 



PART 1 



Second palpal segment normal, third antennal segment usu- 

 ally with a pit 3 



3. Pulvilli absent. Flies with scattered, prominent bristles 



but exceptionally reduced pile, presenting a "bare" ap- 

 pearance Anypodetus Hermann 



Pulvilli present. First posterior cell narrow, closed and 

 with a long stalk ; ambient vein absent . . Nusa Walker 



4. Third antennal segment with numerous, stout bristles dor- 



sally and also laterally or ventrally. First posterior cell 

 closed and stalked. Tergites with stout, lateral bristles. 

 Proboscis robust, but little longer than face. 



Laxeneceba Macquart 

 Third antennal segment without such bristles 5 



5. Ambient vein absent or depauperate Nusa Walker 



Ambient vein well developed 6 



6. Proboscis elongate, greatly compressed and flattened, except 



at immediate base, which may be swollen ; its apex usually 



obtusely rounded in lateral aspects 7 



Proboscis long or short but distinctly subcylindrical and not 

 conspicuously compressed and flattened laterally. Apex 

 of proboscis blunt and the apical half generally reduced 

 in thickness 19 



7. Third antennal segment 3 or 4 times the combined length 



of first and second segments 8 



Third antennal segment not unusually long 11 



8. First posterior cell narrow, closed and usually stalked ; third 



antennal segment exceptionally long 9 



First posterior cell rather widely open 10 



9. Mesonotum with a lateral protuberance above the wing. 



Borapisma Hull 



Without such protuberance 9a 



9a. Face with scales, abdomen pedunculate and wasplike; 

 face scarcely concave, front not swollen. 



Bhopalooasteb Macquart 

 Face without scales; abdomen not pedunculate; face con- 

 cave and front swollen .... Phellopteeon, new genus 



10. Face strongly concave. Front strongly swollen. Third an- 



tennal segment of uniform thickness. 



Stobthyngomebus Hermann 

 Face very slightly concave, front with little or no swelling. 

 Third antennal segment plane above, arched and ex- 

 panded below Dassylina Bromley 



11. Face with scales, besides the usual bristles and pile. Neck 



short ; head quite short and wide. Third antennal seg- 

 ment 2 to 2% times the combined length of the first two 

 segments. Abdomen short, oval and not constricted at 

 base. Femora slender, without bristles. Mesonotum with 

 scanty, subappressed setae and extensive, lateral, not 

 pilose areas. Upper fork of third vein nearly straight ; 

 only the medial third of metasternum membranous. 



Pholidotvs Hermann 

 Face with ordinary pile or bristles or both 12 



12. Hind femur thickened and bearing one or more tubercles 



and sometimes a basal spur 13 



Hind femur not unusually thickened and tubereulate . . 14 



13. Metanotal callosity bare. Scutellum with bristles. Face 



exceptionally short and flat Lampria Macquart 



Metanotal callosity with bristly pile. Scutellum with only 

 short pile. Face not flattened. Brychomyia, new subgenus 



14. Very large, densely pilose flies of wide, robust abdomen; 



the dense, erect, or nearly erect pile of the mesonotum 

 effectively conceals the ground color. Metanotal callosity 

 always with bristly pile. Abdomen usually likewise 



densely pilose Bombomima Enderlein 



Usually smaller, or more slender species, the ground color 

 of mesonotum never wholly concealed by erect pile . . 15 



15. Metanotal callosity with bristly pile (some Nearctic 



species) Laphria Meigen 



Metanotal callosity never with pile 16 



10. Proboscis long but pointed at apex, either sharply or bluntly, 

 and the apex upturned ; apex with many coarse punctures. 



Pagidolaphbia Hermann 



Apex of proboscis also greatly compressed laterally and long 

 and evenly and bluntly rounded at apex. A few punc- 

 tures present or none 17 



17. Bare, shining flies, often highly metallic flies. Hind femur 



distally swollen above, leaving the lower surface plane. 

 Face bristles usually reduced to exceptionally long, iso- 

 lated elements distributed over the low, ventral gibbosity 

 and sometimes with as few as 3 or 4 pairs . Maira Schiner 

 Not such flies 18 



18. Flies with short, appressed mesonotal pile ; abdomen gen- 



erally with dense mats of appressed pile. Face usually 

 with a rounded gibbosity on the lower half, bearing a few, 

 long, wiry bristles with scanty, additional pile and face 

 concave shortly below the antenna. Upper branch of 

 third vein more or less straight. Terminalia often with 

 spatulate extensions from the inverted gonopod and often 

 with tufts containing a few, stout, long bristles. 



Choeeades Walker 



Flies with longer, mostly erect pile. The face tends to 



have dense, mostly but little differentiated pile and 



bristles. Upper branch of third vein gently or strongly 



curved Laphbia Meigen 



19. Metanotal callosity bristly pilose. Face short, straight or 



concave with only weak bristles and hairs. Small, pale 



yellow flies Cenochbomyia Hermann 



Metanotal callosity without pile 20 



20. Proboscis long but pointed at apex, either sharply or bluntly 



and the apex upturned. Apex coarsely punctulate. 



Pagidolaphbia Hermann 



Proboscis long, relatively slender, or quite short, stout and 



basally swollen. Apex of proboscis subcylindrical or even 



slightly depressed but never with apex upturned from 



below. Punctures absent 21 



21. First posterior cell closed and stalked. Abdomen elongate 



but not narrowed basally. Upper branch of third vein 

 nearly straight. Basal angle of third posterior cell sharp 

 and narrow. Hind femur widest beyond the middle but 



not greatly swollen Ichneumolaphbia Carrera 



First posterior cell open 22 



22. Face straight or slightly convex over the whole surface or 



gradually swollen below. Proboscis of moderate length 

 but never short, stout or basally swollen. First palpal 



segment more or less fused 23 



Face swollen below with a low gibbosity or gently extended 

 from antenna to epistoma. Proboscis quite short and ro- 

 bust, scarcely longer than face 25 



23. Face gradually swollen from antennal base to epistoma. 



Third antennal segment short oval ; Old World species. 



Anisosis Hermann 



Face gently rounded or very slightly convex over the whole 



surface, or nearly plane. Third antennal segment slender, 



six or more times longer than wide 24 



24. Face with some long, scattered, slender bristles on the upper 



half and also below. Front with bristly hairs. Hind 

 femur a little swollen distally, its ventral surface with 

 long hairs. Anterior branch of third vein S-shaped, end- 

 ing considerably above the wing apex. Subepistoma 



nearly horizontal Alipiolaphbia Carrera 



Face with or without bristles on the upper half. Anterior 

 branch of third vein gently curved or straight. Subepis- 

 toma oblique Smeeyngolapheia Hermann 



25. Vein closing the discal cell usually aligned and confluent 



with the vein closing the fourth posterior cell, or off-set 

 by a short distance, leaving the lower end vein of the 

 discal cell quite short; rather bare flies of dark blue 

 black coloration and blackish wings ; tergal bristles strong. 



Obthogonis Hermann 

 Lower vein closing the discal cell usually as long as the 

 upper vein ; if the former is eliminated, or greatly reduced 

 the flies are chiefly yellow or brown in color. 



Smebyngolaphbia Hermann 



