444 



UNITED STATES NATIONAL MUSEUM BULLETIN 22 4 



PABT 2 



75(71). Abdomen mthout discal bristles. Scutellum 

 with a double row of long, curved, marginal 

 bristles turned and directed upward. Base of 

 second posterior cell very strongly swollen in 



front 76 



Abdomen with segmental bristles above or below. 

 End vein of fourth posterior cell never partly or 

 wholly aligned with lower end vein of discal 



ceU 77 



76(75). End vein of fourth posterior cell nearly or wholly 

 aligned ^ith lower end vein of discal cell. 

 Anterior crossvein strongly oblique. 



Neolophonotus Engel 

 End vein of fourth posterior ceU not at all aligned. 

 Anterior crossvein nearly rectangular. 



Neod.\sophrts Ricardo 

 77(75). Tergites only with bristles. Anterior crossvein 

 usually very strongly oblique. 



LoPHOPELTis Engel 

 Tergites and sternites with bristles. 



LoPHTBUs Engel 



78(44). Third antennal segment quite long and slender, 



with 2 quite short microsegments and minute 



spine, and without style 79 



Third antennal segment long, or short oval, or 

 pyriform; style always present, long or short . 81 

 79(78). Third antennal segment extraordinarily long, 

 slender, and gradually attenuate; this segment 

 15 to 20 times as long as wide, vrith no micro- 

 segment but with a very short bristle-tipped 

 style. Face very narrow. Posterior margins 

 of tergites with posterior fringe of long, slender 

 bristles. Superior forceps with long, curved, 

 crossed, terminal prong and free space. 



Strophipogon, new genus 

 Third antennal segment not extraordinarily long 



and slender, with very short style 80 



80(79). Third antennal segment nearly or t^^ice as long as 

 combined length of first 2 segments, and very 

 slightly tapered. Microsegments short. Re- 

 mains of first segment of palpus distinct, 

 excavated, and fused medially. Proboscis 

 dorsoventrally flattened, shovellike, truncate at 

 apex. Face a sixth of head width. 



Lycomya Bigot 

 Third antennal segment 1 to V,i times as long as 

 remaining segments and distinctly tapered. 

 Face more than a fourth head width. 



Chilesds Bromley 

 81(78). Anterior basitarsal segment exceptionaOy long, 

 2 or more times as long as succeeding segment 

 and 6 or 7 times as long as vnde. First pos- 

 terior cell greatly narrowed before apex. 



EccoPTOPUS Loew 

 Anterior basitarsus not unusually long .... 82 

 82(81). Posterior branch of third vein ends at or imme- 

 diately below wing apex and anterior branch 

 ends very close to stalk of marginal cell . . 83 

 Posterior branch of third vein ends usually con- 

 siderable distance behind wing apex. First 

 posterior cell not exceptionally long, slender 

 and undulate ; apex of this cell often wide . . 84 

 83(82). First posterior ceU exceptionally long, narrow and 

 undulate, appressed by posterior extension of 

 second submarginal cell. Apex of first poste- 

 • rior cell rather short. Ovipositor of 5 segments, 

 elongate, laterally compressed. 



Nyssomtia, new genus 

 First posterior cell wide at margin, as wide or 

 wider than marginal width of third posterior 

 cell. Face very strongly gibbous and bristly. 

 Terminalia large and clublike. Ovipositor 

 abruptly and strongly compressed laterally 



near base of long eighth segment; remainder 

 short but Ukewise equally compressed. 



PoRAsiLUs Curran 



84(82) . Third antennal segment with several exceptionally 

 long, dorsal, bristly hairs, as long or longer 

 than first segment. Hind basitarsus stout in 

 both sexes. Blue black flies, wings included; 

 basal half of thick and rimmed scutellum flat. 

 Upper half of face plane with eye. Posterior 

 surface of anterior and middle tibiae with dense 

 mats of long, sUky, pale pile. 



Anarmostus Loew 



Dorsal surface of third antennal segment at most 



with a few short hairs, usually with none . . 85 



85(84). Anterior and middle basitarsus exceptionally 

 short, scarcely longer than next segment; ante- 

 rior femur ventrally with a patch of 12 or more 

 stout, spinous bristles; anterior and middle 

 tibia with fine pOe anteriorly. Face gibbous, 

 abrupt above. Anterior mesonotum widely, 

 dense, long, fine pilose . . Echthistus Loew 

 Anterior and middle basitarsus not greatly 

 shortened. Anterior femur not with excep- 

 tional complement of bristles 86 



86(85). Middle femur anteriorly with a conspicuous 

 cluster of numerous, strong, spinous bristles. 

 HoPLOPHEROMERUs Becker 

 Bristle complement of middle femur not excep- 

 tional 87 



87(86). First posterior cell greatly narrowed in middle. 

 Second submarginal cell exceptionally wide at 

 base, and at base widened above and below its 

 origin. Second posterior cell very greatly 

 widened anteriorly at base and 2 to 4 times as 

 wide as narrow discal cell. Wing of male 

 usually expanded. Marginal cell widened and 

 strongly rippled in both sexes. Ovipositor 

 consisting of the hoodlike, or conelike, bristly, 

 eighth tergite, eighth sternite and the extremely 

 short, ninth segment. Large flies. Superior 

 forceps always distinctly and usually consider- 

 ably longer than the gonopod. 



Neoaratus Ricardo 

 Venation not so constructed 88 



88(87). Marginal cell in male expanded, its first 2 veins 

 fused with costa. Subcostal cell in female 

 greatly narrowed through middle. Discal cell 

 strongly occluded and second submarginal cell 

 sinuous above. Face plane Viith eye on upper 

 half, produced as a medium triangle below, with 

 strong, ventral bristles. Ovipositor of 3 seg- 

 ments, elongate, strongly compressed laterally. 

 Clephydroneura Becker 

 Marginal cell in male not expanded. Females not 

 of such construction 89 



89(88). Tergites clearly with only rather fine pile or 

 bristly hairs, except sometimes first tergite. 

 Antennal microsegment present. Face, with- 

 out exception, strongly produced below, often 

 with a strong gibbositj'. If tergites have only 

 fine, short, flat-appressed setae, see couplet 



126 90 



Several tergites with distinct bristles, stout or 

 slender, along the lateral part of posterior mar- 

 gins; if tergal bristles are weak, face is usually 

 short below. Sternites with or without bristles. 

 Antennal microsegment usually present, some- 

 times absent. Face usually produced, but 

 often short or weak and sometimes uniformly 

 or barely convex or even retreating at oral 

 margin 95 



90(89). Basitarsi robust and swollen, especially anterior 

 pair. Gibbosity of face weak, never with 



