224 



UNITED STATES NATIONAL MUSEUM BULLETIN 224 



PART 1 



18. Small, slender flies with broad wings and long neck region. 



Face reduced in height, the supraepistonial area enlarged. 

 Third antennal segment dilate and considerably wider 



than the second Debomyia Philippi 



Large or very large flies, robust and stout but abdomen 

 elongate and cylindroid. Third antennal segment 

 slender 19 



19. Abdomen tapering from base of apex ; third antennal seg- 



ment wider at base ; extremely bare, large flies of denuded 

 appearance, apart from bristles of limited extent. 



Phonicocleptes Lynch Arribiilzaga 

 Abdomen slightly clavate, or narrow basally. Third an- 

 tennal segment spindle-shaped . Blephaeepium Rondani 



20. Anterior tibial process exceptionally long and stout ; it ex- 



tends far beyond the apex of the tibia. Scutellum and 



ocellarium with stout, long bristles 21 



Anterior tibial protuberance, exclusive of spine or spur, not 

 longer than the tibia or if so the fourth posterior cell is 

 open 22 



21. Bristles extend over most of face ; longer bristles clustered 



above the epistoma. A row of stout bristles on hind femur. 

 Acrostical bristles undifferentiated. Head and abdomen 



not drooping Dasypogon Meigen 



Face without pile or bristles above the epistomal mystax. 

 Hind femur with small bristles, or none. Acrostical 

 bristles on mesonotum differentiated. Head and abdomen 

 drooping Sabopogon Meigen 



22. Pulvilli absent 23 



Pulvilll well developed 25 



23. Mesonotum with stout, long, dorsocentral bristles and 



shorter acrostical bristles; first antennal segment with 



stout, long, blunt bristles 24 



Mesonotum with only fine, short pile, appressed or subap- 

 pressed ; first antennal segment without long, stiff, ventral 

 bristles Hodophylax James 



24. Face with a dense fringe of long, adjacent, tectiform, droop- 



ing bristles, reaching nearly to base of antenna : front and 

 ocellarium with a few, fine hairs. Legs with dense, ap- 

 pressed, coarse, opaque, white pile. 



Omninablautus Pritchard 

 Face with numerous, scattered, erect, stout bristles ; front 

 and ocellarium with stout bristles. Legs with fine, sub- 

 erect pile or setae Pabatabactictts Cole 



25. Face exceptionally high, the antenna arising near the 



vertex 26 



Face of normal height and antenna not arising at or near 

 the vertex 27 



26. Lower face produced into a compressed, medial ventral beak. 



Abdomen pedunculate. Discal cell ends with a single vein, 

 the upper element eliminated . . Ertthbopogon White 

 Lower face not beaklike. The first antennal segment scarcely 

 longer than the second ; the long, third, antennal segment 

 is stout, but not wide, and without microsegment. Scutel- 

 lum with bristles Tocantinia Carrera 



27. Second palpal segment greatly enlarged, clavate, with large, 



conspicuous, terminal orifice. Third antennal segment 

 without microsegment. Abdomen usually short, robust or 

 obtusely clublike. Spines of female acanthophorites 

 present but recessed and inconspicuous. Rather small 



flies, usually 28 



Second palpal segment, if swollen and clavate, with very 

 small orifice or none. Abdomen, if clavate, the acantho- 

 phorite spines not recessed 29 



28. Mesonotum developed into a high, arched hump. Abdomen 



never club-shaped Cabaza Walker 



Mesonotum of norniul height. Abdomen usually distinctly 

 club-shaped, the terminal segments expanded and swollen. 



Bbachtbbhopala Macquart 



29. Protibial protuberance prominent, distinctly extended be- 



yond tibial apex, the spur long, slender, pronglike, with 

 stubby apex. Palpus elongate, very slender and attenuate 

 with reduced pile 30 



Protibial spur not pronglike and stubby. Apical tibial pro- 

 tuberance present or absent. Palpus differently con- 

 structed 32 



30. Face rather strongly produced throughout but more promi- 



nent below and evenly and characteristically convex; its 

 maximum length is midway from antenna to epistoma ; 

 face apilose; mystax of 1 row of short bristles. Third 

 antennal segment more than twice as long as combined 

 length of first two segments. Proboscis no longer than 



the face Neoctetopogon Ricardo 



Face moderately produced and not rounded and produced 

 forward in the middle 31 



31. Third antennal microsegment very short and cup-shaped 



and more or less fused to the third segment ; abdomen 

 more or less clavate, shorter than the wings. 



Neosaropogon Ricardo 



Third antennal microsegment well developed and present ; 



abdomen more or less tapered and attenuate, longer than 



the wings Lycotherates, new subgenus 



32. The stout, basal protibial process extends independently of 



spur far beyond the apex of the tibia. Anterior tibia and 

 tarsus unusually long. Whole face with loose, bristly pile. 

 Third antennal segment with numerous, stout bristles and 

 conical spine-tipped microsegment. Acanthophorite spines 

 apparently absent (see Dioctrini) . . Molobbatia Hull 

 Protibial process not exceptionally long; acanthophorite 

 spines protruded 33 



33. Third antennal segment with apical pit and spine or none. 



Microsegment absent 34 



One or more distinct microsegments present at apex of third 

 antennal segment 40 



34. Face rather strongly concave, no part convex, mystax of 1 



row of stout, long bristles ; mesopleuron without pile. 



Aczelia Carrera 

 Face straight, concave on upper or lower portion, or con- 

 vex 35 



35. Fourth posterior cell remarkably long, with nearly parallel 



sides and nearly paralleling wing margin, bends to the 

 rear distally to open narrowly on the wing margin. Base 

 of second posterior cell arched forward and swollen and 

 this cell elongate and drawn distalward. 



Dakinomyia Hardy 



Fourth posterior and second posterior cells of normal 



pattern 36 



36. Head short, quite wide. Face wide, nearly flat or plane, 



with 1 row of moderately stout, mystax bristles and a few, 

 fine, slender hairs on the upper, wholly pubescent face. 

 Proboscis short, robust. Wing with all cells open widely 

 and posterior crossvein long. Third antennal segment 

 with no microsegment, no style or spine. Fore tibia with 

 a black spine curved transversely and no tarsal modifica- 

 tion ; apex of middle tibia with a short, black spine, in 

 addition to the usual bristles. Femora stout but not 

 swollen and without bristles. Tibial bristles prominent. 

 Mesonotum moderately high and a little arched. Head 

 and abdomen a little decumbent. Abdomen punctate. 



Archilaphbia Enderlein 

 Not such flies 37 



37. Base of second posterior cell strongly arched and wide. 



Face convex above, without pile ; epistoma with 1 row of 

 bristles. The dorsocentral bristles before the suture con- 

 sist of fine setae. Scutellum with stout, long bristles. 

 Male superior plate short and cleft to its base. Large 



flies Stizochymus, new genus 



Base of second posterior cell not or but little swollen . . 38 



38. Scutellum with stout, long, marginal bristles .... 39 

 Scutellum without marginal bristles. Third antennal seg- 

 ment gradually widened distally ; apex with a dorsal cleft 

 and sharp spine above the cleft . . Attstenmyia Carrera 





