ASILINAS 



ROBBER FLIES OF THE WORLD 



445 



abrupt, dorsal ledge. Superior forceps and 

 gonopod separated from each other with a 

 conspicuous gap or angle. Ovipositor of 5 

 segments, very elongate, slender; last 3 seg- 

 ments compressed laterally . Astochia Becker 



Basitarsi not exceptionally stout and terminalia 



not so constructed 91 



91(90). Face shining black in middle in both sexes, 

 superior forceps elongate, with middorsal tooth, 

 slender, curved at apex to medial plane, leaving 

 a large, free space. Apex of aedeagus with a 

 long, hook-like filament. Proboscis not ex- 

 tending beyond face. Antennal style thick, 

 exceptionally short, with microsegment. Face 

 gibbosity abrupt below . . Rhadiubgcs Loew 



Face pubescent uniformly. Superior forceps 

 rarely enclosing an oval space. Antennal style 

 of normal length. Proboscis extending beyond 

 face and usually to a considerable extent . 92 

 92(91). Face with strong, stout, numerous bristles loosely 

 arranged over whole of gibbosity. Face gib- 

 bosity prominent and usually rather abruptly 

 produced on its dorsal aspect, leaving a 

 ledge 93 



Face gibbosity in the middle with dense, long, 

 bristly pile. No abrupt ledge dorsally. Third 

 antennal segment stout, short, oval, wider than 

 second segment; style very short and stout. 

 Hypandrium quite short . Antiphrisson Loew 

 93(92). Gonopods meeting below to enclose the whole 

 ventral space. Female eighth tergite not in- 

 corporated in ovipositor. Third antennal seg- 

 ment spindle-shaped. Subapex of hind femur 

 laterally with a ventral band of 4 to 6 ex- 

 ceptionally stout, spinous bristles. 



Lestophonax, new genua 



Gonopods not enclosing the ventral space. Fe- 

 male eighth tergite incorporated in ovipositor; 

 if not, third antennal segment strongly tapered 



from base 94 



94(93). Gibbosity of face with a rectangular ledge. Base 

 of male wing with a milky white color. Aede- 

 agus simple. Proboscis extending a short dis- 

 tance beyond face. Tergite 8 and sternite 8 

 linear and almost totally concealed. Base of 

 second posterior cell but Uttle swollen anteri- 

 orly. Hypandrium absent. Superior forceps 

 enclose an oval space posteriorly. 



Pamponerus Loew 



Gibbosity of face strong, arising gradually. Base 

 of wing not white. Aedeagus trifid. Tergite 8 

 long, at least laterally. Sternite 8 and basal 

 plate long. Female ovipositor consists of cylin- 

 droid conical eighth segment and slender suc- 

 ceeding segments Asilus Linneaus 



95(89). Postlateral margin of last tergite with 1 or more 

 short, sharp spines. Base of wing milky 

 white Amphiscolops, new genus 



No such spines or spinous bristles. Base of wing 



rarely white 96 



96(95). Tergal bristles exceptionally slender. Superior 

 forceps long, attenuate apicaUy, curved and 

 closely adjacent, without free medial space, 

 with a middorsal notch. Face with a strong 

 and abruptly developed gibbosity. Proboscis 

 blunt and short, extending but little beyond 

 face. Abdomen shining black. Scutellum rela- 

 tively thin, with weakly impressed rim. Base 

 of second posterior cell not expanded. Style 

 short. Hj-pandrial plate absent or exception- 

 ally short. Aedeagus -nith terminal fila- 

 ment Stilpnogasteb Loew 



Abdomen pollinose, usually grey or ochraceus or 

 brown. Tergal bristles well developed ... 97 



97(96). Second submarginal cell developed at base 

 slenderly and gradually, as in Glaphyropyga 

 Schiner, and principally or entirely above third 

 vein. Third antennal segment quite short, 

 arista quite long and slender. Face quite narrow, 

 with a few, long, dorsal bristles in addition to 

 mystax. Female ovipositor only moderately 

 compressed and moderately long. Apical seg- 

 ments shortened and sometimes turned down- 

 ward Senoprosopis Macquart 



Second submarginal cell wide at base and not 

 slenderly and gradually developed; this cell 



extends below the third vein 98 



98(97). Face convex and short but beginning to rise 

 gradually a short distance below antenna. 

 Face more or less uniformly convex throughout. 

 Second submarginal cell divided by plane of 

 stem of third vein . . . Epiklisis Becker 



Face never uniformly convex; either quite promi- 

 nent and gibbous or rises gradually so that 

 extension of face is moderate and confined to 



lower half or less 99 



99(98). Face with a very strongly produced gibbosity 

 occupying lower half and usually more than 

 lower half and developed rather abruptly above. 

 Third antennal segment, except in OUgoschema 

 Becker, always with microsegment. Whole 

 gibbosity densely beset with bristly hairs and 

 bristles . . . . " 100 



Face with a weak gibbosity confined to lower half 

 and sometimes less than lower half and de- 

 veloped very gradually; never with a dorsal 

 ledge. Pile and bristles confined to gibbosity. 

 Microsegment present or absent .... 124 

 100(99). Third antennal segment elongate and exception- 

 ally slender, distinctly more narrow than second 

 segment and distally attenuate. First 2 seg- 

 ments with unusually long, dense pile. Last 3 

 or 4 segments of abdomen considerably reduced 

 in length. Gibbosity of face occupies lower 

 four-fifths of face, with abrupt dorsal ledge. 

 Male terminalia large, wide, short, obtuse; 

 hypandrium very short or absent. Superior 

 forceps bifid above and turned inward medially 

 Female terminalia composed of 3 segments, all 

 completely compressed laterally; eighth seg- 

 ment much longer than preceding segments. 

 Fifth to seventh female segments and sixth to 

 eighth male segments all short . Erax Scopoli 



Third antennal segment long or short oval or 

 lanceolate. First 2 segments not exception- 

 ally long, densely pilose. Last 3 or 4 abdomi- 

 nal segments rarely reduced in length and 



shortened 101 



101(100). Occipital bristles with rare exceptions strongly 

 proclinate on dorsal elements. Tergal bristles 

 strong. Tergite 8 and sternite 8 and hypand- 

 rial plate large and elongate. Strong dorso- 

 central bristles in front of mesonotal suture. 

 Face narrow. Male terminalia with large, 

 moderately long, laterally convex superior for- 

 ceps. Hypandrium well developed. Female 

 ovipositor quite elongate, slender, composed of 

 3 to 5 segments and laterally compressed to a 

 moderate to strong extent and progressively re- 

 duced in height Neoitamcs Loew 



Occipital bristles straight or slightly curved. 

 Ovipositor not elongate and slender . . . 102 

 102(101). Face with steep sides laterally and medial mane. 

 Mesonotum with a mane. Middle femur swol- 

 len and stouter than anterior and posterior 

 pairs. Males with superior forceps elongate, 

 tending to curve to medial line and enclose a 



