LMSTI'OGONINAB 



ROBBER FLIES OF THE WORLD 



119 



KEY TO GENERA OF STENOPOGONINI 



8. 



10 



11 



12 



Anterior tibia never with protuberance or spine at apex ; 

 marginal cell always open. Female terminalia always 

 with acanthophorites and spines. Male terminalia with 

 or without rotation. Lateral slopes of the metasternum 

 always with pile. Prosternum characteristically disso- 

 ciated (stenopogonini) 2 



Anterior tibia always with spine, or protuberance and spine 

 at the apex. Marginal cell always open. Female termi- 

 nalia always with acanthophorites and spines. Male ter- 

 minalia always rotate. Lateral slopes of metasternum 

 with pile. Prosternum dissociated . . . Dasypogonini 

 Metanotal callosity always with pile or bristles ... 3 

 Metanotal callosity pollinose or mieropubescent only, never 



with pile or bristles 9 



First posterior cell closed with a long stalk .... 4 



First posterior cell open 5 



Upper occipital bristles often excessively long; scutellum 

 and mesonotum with numerous, very long, stout bristles. 

 Proboscis slender. Anterior femur and tibia with espe- 

 cially dense brushes of coarse, reddish bristles and bristly 

 pile ; brownish orange flies .... Daspletis Loew 

 Mesonotum with dense, long, coarse, bristly hairs or slender 

 bristles. Proboscis long, quite stout and robust. Vein 

 closing fourth posterior cell transverse to this cell. 



Diootobroma, new genus 



Base of second posterior cell strongly expanded anteriorly 



and often narrowly connected to the apically narrowed, 



discal cell ; proboscis extending far beyond the face ; face 



generally with a shallow, transverse depression on the 



lower third 6 



Base of second posterior cell not greatly expanded anteri- 

 orly; this cell widely attached to the end of the discal 

 cell ; proboscis long or short ; face strongly gibbous, abrupt 



above ; transverse depression absent . , 8 



Midtibia with an apical lobe ; large flies of robust form and 



short obtuse, tapered abdomen . Mimoscolia Enderlein 



Midtibia without lobe, with stout, spinous bristles only ; 



large to very large flies, stout, yet of a more slender 



aspect 7 



Third antennal segment with numerous, strong, dorsal setae. 



Epiblepharis (subgenus) Bezzi 



Third antennal segment bare or with 1 or 2 minute setae 



(including Eclipsis Bezzi) . . Microstylum Macquart 



Proboscis short, extending scarcely beyond the face ; basa- 



lare pubescent only Oratosttlum Ricardo 



Proboscis long, rather attenuate near the apex ; basalare 

 with several, distinct bristles ; palpus short and robust. 



Neodysmachus Ricardo 



Postmetacoxal area with a complete chitinized arch ; small, 



weak, brownish yellow, pollinose flies with all posterior 



cells widely open ; anterior tibia without spur. Pulvilli 



well developed ; if pulvilli absent, see Psiliniis Wulp. 



Rhabdogaster Loew 



Postmetacoxal area membranous 10 



Antenna with a plumose style ; very small, bare, pale, polli- 

 nose, slender flies with strongly hump-backed mesono- 

 tum ; face short, largely plane, carrying a radiating tuft of 

 fine hairs ; head broad, wide, short, flattened ; no tibial 



spur Oligopogon Loew 



Antenna without a plumose style 11 



Middle tibia with at apex a pair of stout, spinelike bristles, 

 directed more or less rectangularly backward. 



Callinicus Loew 

 Middle tibia with only strong, distally turned bristles, or 



rarely with a straight, spinelike bristle 12 



Head with interocular space (face) very wide below, 

 strongly, and progressively narrowed to the vertex ; elon- 

 gate, slender flies 13 



nead with interocular space (face) wide or narrow, the 



sides approximately parallel, at most slightly convergent 

 or divergent ; tibial spur present or absent .... 15 



13. Pulvilli well developed 14 



Pulvilli atrophied (Leptogastrinae), Acbonyches Williston 



14. Face and occiput inflated, protuberant; the face quite con- 



vex ; subepistoma nearly horizontal. Proboscis not ex- 

 tended beyond face. Antenna elongate; third segment 

 with broad, short, microsegment having a spoonlike de- 

 pression and spine . . . Cystoprosopa, new subgenus 

 Face and occiput not inflated; face plane or very slightly 

 convex ; subepistoma extensive, oblique. Antenna short 

 or long, the microsegment cylindrical, tapered, with spine 

 at apex Plesiomma Macquart 



15. Face hoodlike, extended in a strongly produced, and rather 



sharply pointed, ventral beak ; that portion above the 



apex plane Lycostomus Hermann 



Face never produced into an angulate, ventral, hoodlike 

 beak 16 



16. Pulvilli absent or rudimentary and reduced to distinctly 



less than half the length of claw 17 



Pulvilli well developed 26 



17. Claws with an additional, shorter claw or tooth at it base; 



large flies Dicrands Loew 



Claws simple 18 



18. Face plane and on the upper half plane with the eye ; head 



narrow, nearly circular in anterior aspect, the face ex- 

 ceptionally narrow ; bristly flies of medium size, with the 

 posteroventral occiput extensively recessive. 



Galactopogon Engel 

 Face not plane and head not circular 19 



19. Pulvilli about one-fourth to one-fifth as long as claws ; an- 



tenna attached at the middle of head ; abdomen more 

 elongate than in Sisyrnodytes Loew ; mesonotum not at 

 all humped ; pile or bristles confined to the lower half of 

 face ; proboscis distinctly extended beyond the face. 



Theromyia Williston 

 Pulvilli absent or with minute stubs 20 



20. Second submarginal cell rectangular at base, with a long, 



appendicular vein. Dorsocentral bristles and all nieso- 

 notal and scutellar bristles stout and exceptionally long. 



Metapogon Coquillett 



Second submarginal cell emerges gradually and after the 



usual pattern 21 



21. Eye in profile distinctly wider ventrally than dorsally ; 



first and second antennal segments with exceptionally 



long, stout bristles ventrally, more rarely dorsally . 22 



Eye in profile not wider below and usually more 



narrow 23 



22. First posterior cell open ; fourth posterior cell usually open ; 



the postmarginal veins reach the wing margin ; second 

 submarginal cell usually with a basal spur; the ambient 

 vein ends at the anal cell . . Acnephaltjm Macquart 

 First and fourth posterior cells closed; postmarginal veins 

 evanescent ; second submarginal cell without basal spur ; 

 ambient vein absent Sisyrnodytes Loew 



23. Posteroventral margin of eye extensively recessive . 24 

 Posteroventral eye margin not unusually recessive; lower 



occiput not greatly developed . . . Mecynopus Engel 



24. Mesonotum with a mane ; face strongly convex-gibbous, 



with exceptionally long, dense, fine pile. , 



Anarolius Loew 



Mesonotum without mane ; face not unusually gibbous and 



densely pilose 25 



25. Pile of face abundant, sometimes matted and tectiform. 



General pile either coarse or scalelike. Small, rather 

 slender flics, partly pollinose, partly shining ; many spe- 

 cies pale in color Ablautus Loew 



Pile of face restricted to a few, slender bristles on the lower 

 half, stronger above the epistoma. Slender, pale, polli- 

 nose flies, never' with scales .... Psilinus Wulp 



535914— 62— pt 1- 



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