LAPHRHNAB 



ROBBER FLIES OF THE WORLD 



349 



KEY TO GENERA OF ANDRENOSOMINI 



1. Postmetacoxal area fused but with a midventral seam. 



Pboagonistes Loew 



Postmetacoxal area never fused but sometimes narrowed 



by lateral encroachment of chitin 2 



2. Three submarginal cells Pogonosoma Rondani 



Two submarginal cells 3 



3. The middorsal margin of the proboscis bears numerous, long 



stout bristles ; metanotal callosity with bristles. 



Neophoneus Williston 

 Proboscis without such bristles 4 



4. Apex of proboscis greatly thinned dorsoventrally and pointed 



in lateral aspect, but comparatively wide and shovellike 



at apex 6 



Apex of proboscis as greatly narrowed laterally as dorso- 

 ventrally 5 



5. Metanotal callosity without bristles ; flies with very large, 



elongate abdomen, with strong tergal bristles. They are 

 comparatively short pilose flies and the first posterior cell 

 is widely open. Face extraordinarily gibbous, rounded 

 and domelike; third antennal segment often widely oval 



and flattened Pboagonistes Loew 



Metanotal callosity with bristles ; medium to large, New 

 World flies, less elongate in form ; proboscis unusually 

 pointed and upturned at apex ; face also strongly gibbous 

 and rounded ; proboscis extending well beyond the face 

 and upturned at apex ; metanotal callosity with bristles. 

 First posterior cell open or closed but always narrow. 



Pilica Curran 



6. Metanotal callosity with bristles; large flies with broad, 



rather flattened abdomen and bright colored pile in part; 

 wings often banded; first posterior cell narrow and nar- 

 rowly open or closed ; the dense mystax directed down and 

 forward, beyond and enclosing the proboscis. 



Dastllis Loew 

 Metanotal callosity without bristles or pile 7 



7. Ambient vein absent or depauperate; mystax of face decum- 



bent and tectiform, extending to near the base of antenna ; 

 hind femur swollen distally; pile reduced on thorax and 

 especially upon abdomen ; first posterior cell closed with 



a long stalk Cerotai.mops Curran 



Ambient vein normal 8 



S. Proboscis considerably longer than face; palpus greatly wid- 

 ened and flared ; first posterior cell widely open ; abdomen 

 rather narrow and pile moderate in quantity. 



Systbopalpus, new genus 

 Proboscis short, and usually scarcely longer than face . . 9 

 9. Large or very large flies, exceptionally stout and robust, with 

 dense, long pile especially on the legs and the lateral ab- 

 dominal margins and pleuron .... Htpebechia Schiner 

 Flies of medium size, or sometimes rather small ; form elon- 

 gate and cylindroid, never exceptionally broad and stout; 

 pile reduced and usually moderate in quantity. 



Andbenosoma Rondani 



Genus Andrenosoma Rondani 

 Figubes 271, 644, 1213, 1217, 2083, 2100, 2142 



Andrenosoma Rondani, Dipterologiae italicae prodromus, vol. 1, 



p. 160, 1856. Type of genus: Asilus atra Linnet 1758, by 



original designation. 

 Elaeotoma A. Costa. Atti Accad. Sci. Napoli, vol. 1, p. 49, 



1863. Type of genus: Elaeotoma adustiventris A. Costa, 



1863, by monotypy. 

 fSenoxericera Macquart, Dipteres exotiques, suppl. 4, p. 71, 



1849. Type of genus : Senoxericera albibarbis Macquart, 



1849, by monotypy. 

 TStenoxericera Kert^sz, Catalogus dipterorum . . ., vol. 4, 1909. 



Emendation. 



Large flies, the cephalic and leg pile rather long and 

 abundant, but the thoracic and abdominal dorsum with 

 either comparatively scanty pile or rather short pile. 

 Wings often smoky or brownish black, especially along 

 the veins. Tergites with strong bristles, sometimes 

 concealed by pile. Face strongly gibbous below, with 

 stout or sometimes spikelike bristles. Third antennal 

 segment dilated beyond the base, with no microsegment. 

 Only two submarginal cells are present. These flies are 

 quickly distinguished from the Laphriini of similar 

 appearance by the dorsoventrally depressed, shovellike 

 apex of the proboscis. Length 16 to 25 mm. 



Head, lateral aspect: The head, including the face 

 is quite long, the lower face is strongly gibbous and 

 produced. Occiput tumid and prominent below due 

 to the recession of the eye, which begins at the upper 



fourth of the head and is gradual. Pile of occiput 

 dense, fine and long. There are a few deeply placed, 

 dorsal bristles often nearly hidden by pile. The pro- 

 boscis is exceptionally stout, swollen below at base, the 

 apex narrowed chiefly from below and the whole apical 

 fourth above and below bears numerous, anteriorly 

 curled bristles and bristly hairs. It is strongly flattened 

 dorsoventrally at the apex and the ventral basal half is 

 densely long pilose. Palpus of two segments, the sec- 

 ond segment open and thin, flattened and scooplike, the 

 outer surface and apex with bristly hairs. The antenna 

 is attached near the upper fourth of the head and a 

 considerable portion of the head extends below the eyes. 

 The antenna is approximately the same length as the 

 head, the first segment nearly twice as long as the sec- 

 ond. The third segment is as long or a little longer 

 than the first two, attenuate at the base but strongly 

 dilated and flattened over the remainder and narrowing 

 a little towards the apex. The apex bears a small pit 

 and concealed spine. 



Head, anterior aspect : The head is not as wide as the 

 thorax; the face is wide, about one-third the head 

 width, slightly divergent below and the upper, not gib- 

 bous, portion either has abundant, long, bristly pile or 

 some weak bristles and pile. Pile generally coarse, but 

 sometimes very fine and crinkled and scattered among 

 the bristles of the whole face. Gibbosity of face with 

 numerous, very long, curved, medium stout bristles or 

 with shorter, less numerous, spikelike bristles. Front 

 and face each with or without pollen. Vertex a little 



