DASYPOGONINAB 



ROBBER FLIES OF THE WORLD 



115 



Distribution: Palaearctic: Rhadinus Jchargaiensis 

 Efflatoun (1937) ; megaton-he Loew (1856) ; ungulinus 

 Loew (1856) ; tewfiki Efflatoun (1937). 



Genus Lasiopogon Loew 



Figures 64, 460, 896, 905, 1680, 1682, 1984, 2015 



Lasiopogon Loew, Linnaea Entomologiea, vol. 2, p. 508, 1847. 



Type of genus: Dasgpogon pilosellus Loew, 1847, as Dasy- 



pogon hirtellus Meigen, 1820, not Fallan, the second of 3 



species. Designated by Rondani, 1S56. 

 Daulopogon Loew, Berliner Ent. Zeitschr., vol. 18, p. 377, 1874. 



Erected because of use of Lasiopogon in plants. Type of 



genus : Same as for Lasiopogon. 



Lasiopogon has 1 subgenus, Alexiopogon Curran. 



Small flies with slightly tapered and flattened ab- 

 domen, at the base as wide as the mesonotum and with 

 a strong, suggestive, general similarity to therevids. 

 They are characterized by the protuberant, rounded 

 face bearing many long, strong bristles; rather nu- 

 merous, long bristles on the thorax and scutellum. From 

 genera of somewhat similar, general appearance such 

 as Cyrtopogon Loew, Nannocyrtopogon Wilcox and 

 Martin, or Lestomyia Williston, they will be quickly 

 separated by the absence of pile on the lateral metas- 

 ternum, the strongly divergent front and the small, 

 cylindrical, attenuate palpus, which usually lacks apical 

 bristles. Lasiopogon is a member of the Stichopo- 

 gonini and is not closely related to the Cyrtopogon 

 group of genera. Length 8 to 12 mm. 



Head, lateral aspect : Head not quite as long as high. 

 Face conspicuous, strongly produced and convex, tend- 

 ing to be abrupt and reduced to the eye level for a 

 narrow space immediately below the antenna. Eye 

 long, strongly convex anteriorly and rather strongly 

 recessive anteroventrally. The occiput is well devel- 

 oped throughout, especially below. The pile of the 

 occiput is dense, fine, and moderately long, beginning 

 at the middle and continuing below but on the upper 

 half it is replaced by numerous, slender bristles which 

 in the type of genus become long and curled forward 

 from the base at the upper corners of the vertex. The 

 proboscis is directed obliquely forward or downward, is 

 stout in dorsal view and strongly expanded towards the 

 base; the apex is quite obtuse; it has a rather well devel- 

 oped medial ridge but only on the basal half. The 

 apex has some fine hairs above and below, narrowly; 

 the base has a number of long, stiff hairs ventrally. 

 Palpus small, cylindrical, slightly tapered apically ; the 

 first segment is short, hemicylindrical and excavated ; 

 it is fused at least medially; the apex of the second seg- 

 ment has a large pore, is obliquely truncate and its bris- 

 tles reduced in number, 1 subapical and 2 or 3 lateral 

 bristles in the middle. Antenna attached just above 

 the middle of the head ; only moderately long, first two 

 segments short and nearly equal in length ; third seg- 

 ment a little more than iy 2 times as long as the first 

 two combined, bearing a single, elongate microsegment 

 which is scarcely tapered apically but carries an un- 

 usually long, sharp, apical spine. Pile of the first two 



segments rather more than usually abundant, mod- 

 erately long, oblique, quite stiff and bristly. 



Head, anterior aspect: The face below the antenna 

 is about one-fourth the head width, or less and diver- 

 gent below. The front is strongly divergent to the 

 vertex. The subepistoma is small, nearly horizontal, 

 concave, and pubescent. The face is pubescent, bear- 

 ing on the gibbous portion, except narrowly along the 

 eye margin, quite numerous, long, stiff bristles. The 

 front is long, pollinose, bears numerous long, slender, 

 bristly hairs widely along the lateral margins and addi- 

 tional submedial row separated by a longitudinal 

 crease, The front is strongly divergent and is mod- 

 erately excavated with gently sloping sides; it bears 

 a large, conspicuous ocellarium carrying 2 or 3 pairs of 

 long, stiff bristles and in addition 3 to 5 pairs of long, 

 fine hairs. Anterior eye facets only a little enlarged. 



Thorax: The mesonotum is low and pollinose but the 

 pleuron finely appressed pubescent, Pile of the meso- 

 notum for the most part fine and bristly, long or short; 

 characteristically with quite long dorsocentral bristles 

 extending to the posterior level of the humerus. Acros- 

 tical bristles scattered but distinct. In the type of genus 

 there is the following complement of long, mostly 

 slender bristles : 1 posthumeral, 2 notopleural, 5 or 6 

 supraalar, 3 postalar, and 6 to 8 scutellar bristles. 

 Scutellum flattened, pubescent, with pile submarginally. 

 Propleuron with moderately long pile; collar with stiff 

 pile only, posterior section only with long, stiff pile, 

 mesopleuron behind with 7 or 8 slender bristles or 

 bristly hairs. Upper sternopleuron with some long pile. 

 Pteropleuron and hypopleuron apilose, metapleuron 

 with 8 long, stout bristles in a single row, sometimes 

 reduced in number. Metanotum micropubescent only, 

 the lateral metasternal slopes without pile, the ventral 

 metastemum chitinized but narrow and separated from 

 the first tergite only laterally; it bears a transverse 

 crease across the middle and only the posterior part has 

 pile. Postmetacoxal area membranous only; tegula 

 with bristles. 



_ Legs : The legs are moderately stout but not swollen ; 

 pile of the femora abundant, short, flat appressed dor- 

 sally and laterally but with rather abundant, fine, erect 

 pile ventrally and many long, slender, additional, 

 bristly hairs in the type of genus, fewer in other species. 

 In the type of genus the following complement of 

 bristles present : on the hind femur 15 lateral, shifting 

 to a dorsolateral position apically, with 2 or 3 dorso- 

 medial at the apex. Its tibia with long, well developed, 

 basally stout, finely attenuate bristles of 9 dorsal, 9 or 

 10 shorter, finer dorsolateral, 6 longer stout lateral, and 

 6 ventral bristles. Ventral surface of the tibia with 

 long, stiff pile and a brush of setae on the outer third. 

 Middle femur with a few weak bristles posteriorly at 

 the apex; its tibia has 8 or 10 moderately strong dorsal, 

 6 to 8 mostly weak posterior, 3 or 4 weak, long postero- 

 ventral, a like number of antero ventral, but only 5 or 6 

 especially strong, long, oblique anterior bristles. An- 

 terior femur with long, stiff, erect pile posteriorly and 



