DASTPOGONINAE 



ROBBER FLIES OF THE WORLD 



131 



dorsal, 1 posterodorsal, 2 medial, and 4 ventral bristles. 

 Middle femur with a row of 9 posteroventral bristles 

 and 4 anteroventral bristles and 3 posterior elements at 

 the apex; middle tibia with 5 anterodorsal, 3 postero- 

 dorsal, 5 posteroventral, and 2 ventral elements, all pale. 

 Anterior femur with 4 dorsal, located especially on the 

 outer third, with 10 to 12 ventral elements in partly 

 double rows and mostly basal in position; anterior tibia 

 with 6 oblique, short, anterodorsal elements and 6 

 longer, posterodorsal bristles and 6 posteroventral 

 bristles; apex with 1 extremely long, anterior bristle, 

 another posteriorly and 8 shorter bristles; no spine 

 present. The apex of the first 2 tarsal segments and 

 the base of the first segment bear long, stout, pale ap- 

 pressed bristles. End tarsal segment long and slender, 

 a little longer than the preceding tarsal segments ; basal 

 segment as long as the next 2 together. The claws are 

 long, gently curved from the base, moderately sharp; 

 the empodium is stout throughout, sharp at apex, only 

 half as long as claw ; pulvilli absent. 



Wings : The marginal cell is widely open ; fourth 

 posterior cell slightly narrowed; the second basal cell 

 ends in 3 veins, the middle vein short; anal cell nar- 

 rowly open. The anal notch is deep, the alula large, 

 elongate apically ; ambient vein complete. 



Abdomen: The abdomen is moderately robust and 

 slightly tapered ; at the base it is as wide as the meso- 

 notum, and the whole nearly subcylindrical. The sides 

 of the first tergite bear a long, vertical row of 12 to 14 

 yellow bristles which are both stout and weak, and 

 additional fine hairs. Sides of second to fourth tergites 

 with an oblique row of 3 stout, long, pale bristles. 

 Sternites with long pile. Females with 8 tergites. The 

 male terminalia are moderately conspicuous with the 

 ■ epandrium deeply divided but fused at the base ; the 2 

 halves are prominent, comparatively long, and obtusely 

 convex posteriorly. The proctiger is unusually large 

 and prominent, thrust obliquely upward. Gonopod 

 smaller, but long, and more or less attenuate apically. 

 Hypandrium short but thick and convex. Ovipositor 

 composed of two segments, the seventh and eighth, and 

 the former is about twice as long as the latter ; it bears 

 apically 5 rounded, scooplike reddish spines on each 

 side. 



Distribution: Palaearctic: Galactopogon hispidus 

 Engel (1929). 



Genus Gonioscelis Schiner 



Figures 13T, 451, 916, 925, 1561, 1710, 1778, 1782, 1911 



Gonioscelis Schiner, Verh. zool.-bot. Ges. Wein, vol. 16, p. 670, 

 1866. Type of genus : Dasypogon hispidus Wiedmann, 

 1819, by original designation. 



Bristly flies of medium size or smaller, with elon- 

 gate, tapered abdomen which ends obtusely. Head 

 circular from the frontal aspect. Characterized by the 

 closed and petiolate fourth posterior cell and especially 

 the anterior coxa, femur and tibia which are raptorial 



and armed with clusters of stout spines. Length 12 to 

 22 mm. 



Head, lateral aspect : The head is of medium length. 

 The face and occiput are well developed below; the 

 facial gibbosity begins a little above the middle of the 

 face. The upper occiput is nearly but not quite oblit- 

 erated by the eye. The upper occiput has long, stiff, 

 anteriorly curled hair; lower occipital pile finer and 

 straight, of about the same length ; middle pile shorter. 

 Proboscis small, cylindrical, bluntly pointed, and di- 

 rected chiefly forward; it has a low, distinct dorsal 

 ridge, fine hairs at the apex, and rather abundant, long, 

 stiff pile ventrally on the basal half. Palpus of two 

 segments. First segment quite short, excavated; the 

 second segment long, cylindrical, slender with a pore at 

 apex. The antenna is attached just above the upper 

 third of the head. The antenna is slender, the first two 

 segments rather long, with the first slightly longer than 

 the second. First segment with long, stiff bristles 

 above, below, and laterally; the second segment is 

 similar but with fewer bristles. The third segment is 

 iy 2 times as long as the first two segments combined, 

 slightly flattened, slightly wider in the middle, grad- 

 ually tapered in either direction, ending in a short, 

 acutely pointed, needle-tipped style or microsegment ; 

 style one-fourth the length of the third segment. 



Head, anterior aspect: The head is almost circular; 

 anterior eye facets scarcely enlarged. Front and face 

 micropubescent, the former with 2 or 3 fine hairs, the 

 vertex with 17 or 18 moderately long, strong bristles. 

 Face with a wide, medial, vertical band of quite stiff, 

 bristly hairs throughout its entire height; this band ex- 

 pands and widens below, leaving the sides of the face at 

 least narrowly bare of pile. The face at antenna is nar- 

 row and expanded below to a little more than twice the 

 upper width of the face. Front of the same width as 

 upper face, its sides parallel. Vertex virtually without 

 excavation. 



Thorax : The mesonotum moderately convex ; every- 

 where pilose including the humerus but not on the 

 scutellar surface. Notopleuron with 3 strong posterior 

 and 2 weak anterior bristles ; supraalar bristles 1 to 12 

 in number ; postalar region with a double row, 3 or 4 be- 

 low, 2 above; scutellar margin with 1 to 5 pairs of 

 bristles. Propleuron and posterior mesopleuron pi- 

 lose; in some species the upper mesopleuron and meta- 

 pleuron is without any pile. Lateral metanotal slopes 

 without pile; lateral metasternum also without pile; 

 ventral metasternum with numerous, long, fine hairs. 

 The postmetacoxal area is membranous and the pres- 

 ternum fully dissociated. The humerus may have 1 to 

 12 bristles. Metanotum without pile. 



Legs : The posterior femur is slightly thickened, mid- 

 femora more thickened and the anterior femur massive 

 and gradually but very greatly thickened on the basal 

 portion; the immediate base is expanded forward and 

 the anteroventral surface heavily beset with short, 

 stout, spinous setae or bristles which are opposed to a 

 similar row on the ventral side of the tibia ; these tibial 

 bristles are larger and sharper and rarely may be absent 



