ROBBER FLIES OF THE WORLD 



447 



122(121). Ovipositor elongate, strongly compressed laterally; 

 length of eighth tergite 3 or 4 times the com- 

 bined length of last 2 tergites . Machimus Loew 

 Ovipositor not elongate; the eighth tergite 1 or 2 

 times the combined length of last 2 ter- 

 gites 123 



123(122). Sternites with strong bristles or at least several 

 segments (subgenus of Machimus Loew). 



Epitbiptus Loew 

 Sternites with fine pile (subgenus of Machimus 



Loew) ToLMERus Loew 



124(99). Third antennal segment slender, long, attenuate, 

 and nearly equal in length to relatively short 

 arista; a small, conspicuous or inconspicuous 



microsegment present 125 



Third antennal segment distinctly short oval and 

 only a little narrowed apically; arista character- 

 istically long, fine, distinctly longer than third 

 segment; microsegment absent. Lower branch 

 of third vein rather strongly undulate or wavy. 



132 



125(124). Scutellum with only fine, short, delicate setae, 



bristles absent 126 



Scutellar margin with 1 or more pairs of well 



developed bristles 128 



126(89, 125). Tergites without bristles but with abundant, fine 



setae Negasilus Curran 



Tergites with bristles 127 



127(126). Second submarginal cell at base widened only 

 above third vein and this cell ends far behind 

 wing apex. In males, terminalia greatly 

 widened laterally and inferior surface open, with 

 very large, down-curved, pseudoclaspers; clas- 

 pers also present. Superior forceps and very 

 short gonopod with a gap or angle between. 



Cnodalomtia, new genus 



Second submarginal cell widened at base both 



above and below and very little widened at apex 



along margin. Small flies . . Cerdistus Loew 



128(125). Sternites with some well developed, characteristic, 

 stout bristles present. Face generaUy plane or 

 nearly plane, the lower half never more than a 

 slight elevation of a very short gibbosity. No 

 anterior dorsocentral bristles present, only setae 

 present anteriorly. Male terminalia with sim- 

 ple, superior forceps, which tend to be blunt, 

 obtuse, somewhat widened laterally, although 

 in some species tapered or narrowed at apex; 

 there, a small, sharp spur, or lobe, turned in- 

 ward. Male terminalia also with distinctly 

 elongate, ventral, apposed gonopods. Superior 

 forceps of terminalia enclose or almost com- 

 pletely close off ventral cavity of terminalia. 

 Ovipositor moderately elongate and distinctly 

 compressed laterally. Third antennal segment 

 never conspicuously attenuate. 



Neomoctherus Osten Sacken 

 Sternites at most with slender, bristly hairs or pile. 

 Lower face also poorly developed but sometimes 

 vsith a moderate gibbosity. Anterior dorsocen- 

 tral bristles present or absent, or replaced by 

 setae. Male terminalia simple; superior forceps 

 generally elongate; gonopods ventral but not 

 apposed. The superior forceps short or long 

 but never high, and inferior surface of termi- 

 nalia completely open, with prominent, exposed 

 penis valves and aedeagus, except as gonopod 

 sometimes encloses the basal portion . . . 129 



129(128). Superior forceps long, with or without a notch 

 but enclosing a characteristic and conspicuous, 

 posterior space. Gonopod closely apposed to 

 superior forceps. Ovipositor with 1 or more 

 terminal pairs of stout spines on the tenth 

 segment Philonicus Loew 



Superior forceps with at most a minute, posterior 

 space or if a large opening is present, gonopod 

 and superior forceps conspicuously divergent. 



130 

 130(129). Lower branch of third vein strongly undulate or 

 with a bend in middle. Terminalia large, supe- 

 rior forceps with a deep, lateral, terminal 

 notch. Ovipositor short, quite cylindrical or 

 short conical, composed of 3 segments. Last 

 sternite and tergite in both sexes with numerous, 

 conspicuous, postmarginal bristles. Third an- 

 tennal segment characteristically slender, at- 

 tenuate, a little shorter than the rather fine 

 arista and small microsegment. 



Orophotus Becker 



Lower branch of third vein usually nearly straight, 

 rarely with a pronounced bend and otherwise 



not as in Orophotus Becker 131 



131(130). Third antennal segment slender, long, equal in 

 length to arista, a small microsegment present. 

 Lower branch of third vein undulate; second 

 submarginal cell wide at base, but almost en- 

 tirely widened above third vein. Gibbosity of 

 face confined to lower third of face; upper 

 face without pile or bristles. Male terminalia 

 simple; superior forceps with small, apical notch 

 and small space. Ovipositor short, cylindroid 

 conical, the small ninth and tenth segments 

 deflected downward. Last sternites and tergites 

 with only stiff hairs, no bristles. 



CoBALOMTiA, new genus 



Ovipositor of female moderately long and charac- 

 teristically compressed laterally beyond the 

 middle of eighth tergite. Superior forceps 

 small, with at most a very small terminal 

 notch or none. Third antennal segment com- 

 paratively robust, but little attenuate, arista 

 sometimes shorter than third segment and 

 microsegment characteristically conspicuous. 

 Last sternite and tergite without unusual 

 bristles. Face not prominent. 



Cerdistus Loew 

 132(124). Face without a dorsal ledge; sides of face, from 

 anterior aspect, nearly vertical. Male termi- 

 nalia with superior forceps similar to Helig- 

 moneura Bigot but gonopod well developed and 

 lateral, tending to be enclosed by superior 

 forceps. Female eighth tergite and sternite 

 each with a postmarginal fringe of long, strong 

 bristles, especially emphasized on tergite. 

 Males often with a conspicuous fringe of stout, 

 true, lateral bristles on third to fifth tergites, 

 none on second. Paralobi present, replacing 

 claspers. Ventral side of lamella covered with 

 stiff bristles Oligoschema Becker 



Gibbosity of face confined to lower third of face 



and also developed gradually 133 



133(132). Gonopod large, prominent and lateral and not 

 enclosed by superior forceps; there tends to be 

 a gap or angle developed between these later- 

 ally and apically. Arista unusually long and 

 slender. Last female sternite with well de- 

 veloped bristles. Claspers and pseudoclaspers 

 present, borne by gonopods 134 



Gonopod small and quite short, inconspicuous, 

 ventral, and enclosed by extraordinarily large 

 superior forceps, which are wide, obtuse and 

 bear a remarkably deep cleft. Face below an- 

 tenna more than an eighth head width. Aristal 

 style very slender but rather short. First 

 posterior cell only moderately widened apically. 

 Female eighth tergite and sternite with only 

 weak, bristly hairs along the posterior margins. 

 Claspers present, borne by gonopod, and also 



