DAS1-P0G0NINAE 



ROBBER FLIES OF THE WORLD 



39 



slender bristles more or less matted together and with 

 some long, coarse pile along the ventral margins. The 

 scutellum is small, with a flat disc, and lying close to 

 it are a number of stiff, bristly hairs projected back- 

 ward from the immediate, overhanging, prescutellar 

 margin; its disc seems to be without pile, but is pubes- 

 cent. Propleuron with a long, fine tuft of pile. 

 Mesopleuron without pile, except on the anterior pro- 

 longation. Upper sternopleuron and the pteropleuron 

 with 8 to 10 fine, long, erect hairs. Hypopleuron with- 

 out pile, but with a differentiated patch or spot of 

 micropubescence. Metapleuron with a wide band of 

 long, stiff, very slender bristles or bristly hairs. Meta- 

 notal slopes micropubescent only; met asternal slopes 

 and the metasternum both with numerous, fine, long 

 hairs; postmetacoxal area very short and limited but 

 distinctly membranous. Basalare with long, stiff setae. 



Legs : All the femora and tibiae slender. The hind 

 femur and tibia especially slender and elongate. This 

 femur bears 8 bristles, including one at the apex and 

 2 weak, dorsomedial bristles at apex. Ventrally is a 

 moderately abundant fringe of long, fine, stiff hairs. 

 The hind tibia carries 2 moderately long, curved, 

 oblique, dorsolateral and 6 or 7 longer dorsomedial, and 

 5 moderately long, ventrolateral bristles. The ap- 

 pressed, ventral brush of setae extends to the middle. 

 Hind basitarsus considerably swollen and robust, a lit- 

 tle longer than the next 3 segments. Middle femur with 

 2 bristles posteriorly at the apex, a fringe of stiff pile 

 below ; its tibia bears 5 long, slender, attenuate, postero- 

 dorsal bristles, but the 6 anterodorsal and 2 ventral 

 bristles are exceptionally long, a little curved, oblique, 

 and fully three-fourths as long as the tarsi. Anterior 

 femur with copious fringe of stiff pile ventrally. The 

 tibia with 4 or 5 bristles dorsally and 2 long, posterior 

 bristles. Apex of tibia without spur. All tarsi bear 

 well developed pulvilli ; empodium half the length of 

 the sharp claws. 



Wings: The wings are hyaline, the marginal cell 

 widely open. Second submarginal cell strongly arched 

 at its base; the anterior branch of the third vein ends 

 at wing apex; the posterior branch well behind apex. 

 The first posterior cell is fully open; both end veins 

 of discal cell long. Fourth posterior cell narrowed to 

 two-thirds of its maximum width; anal cell widely 

 open ; second basal cell ends in 3 veins. Alula narrow 

 and linear; ambient vein complete. 



Abdomen: The slender abdomen is somewhat com- 

 pressed laterally and as long as the wings. The first 

 tergite is a little swollen laterally. Seven tergites 

 present in the male with the eighth present as a short, 

 linear flap. Pile of abdomen more or less appressed 

 dorsally; on the posterior half of the abdomen the pile 

 is setate but long, fine and curled on the first three ter- 

 gites and the sides of the fourth. Stemites with stiff, 

 long, bristly hairs in contrast to the tergal pile. All 

 tergites without bristles. Male terminalia moderately 

 large and conspicuous, fully rotate; the hypandrium 



extends from the dorsal margin as an extended, narrow 

 process curled down over the apex of the terminalia. 



Distribution: Australian: Broticosia ravax Hull 

 (1957). 



Pegolabrus, new genus 



Type of genus : Pegolabrus paramonovi, new species. 



Slender flies of medium size, with faint brassy reflec- 

 tions from the abdominal tergites. Related to Brotico- 

 sia Hull but differing in the presence of long, bushy 

 pile on the disc of the scutellum. Fourth posterior 

 cell closed and stalked. Length 14 mm., including 

 antenna. 



Distribution: Australian: Pegolabrus paramonovi, 

 new species. 



Pegolabrus paramonovi, new species 



Male. Head : The head is circular from the anterior 

 aspect, with very narrow upper face, which widens be- 

 low. Front and vertex also narrow but a little wider 

 than the upper face. The head is black throughout in 

 ground color. Pile of upper occiput rather dense, ex- 

 ceptionally long, fine and black. There are numerous, 

 similar, long, fine, black hairs arising from the large 

 ocellar triangle, which is nearly equilateral in shape. 

 Sides of front with a tuft of long, fine, black hairs. 

 Antenna slender, elongate and black. Surface of face 

 densely covered with pale, yellowish white, appressed 

 micropubescence, which is rather whitish on the sides of 

 the low, facial gibbosity. The medial half of the face 

 has a vertical band of dense, remarkably long, fine, black 

 hairs in matted tufts. These tufts of hairs diverge 

 along the sides of the facial gibbosity below and are 

 equally long but somewhat less dense. These ventral 

 hairs enclose a tonguelike tuft of matted, long, pale 

 yellow hairs. In the midline at the bottom of the face 

 above the epistoma is another tuft of dense, matted, 

 long, black hairs. Proboscis short, shining black and 

 bluntly rounded. It is directed downward but if ex- 

 tended forward it would reach but little beyond the 

 epistoma, if at all. Palpus of two segments, the first 

 of which is excavated, the second short, robust, with 

 numerous, fine, black hairs. Both segments are black. 

 The central portion of the upper occiput on its lower 

 part has considerable long, fine, yellowish white hairs. 

 Laterally the lower third of the occiput has some quite 

 short, yellowish white hairs. 



Thorax: The mesonotum is black, obscurely shining 

 across the middle, a little more polished opposite the 

 wings and with a large, more or less triangular patch 

 of minute, greyish white micropubescence which is al- 

 most pollenlike on the anterior half of that part of the 

 mesonotum in front of the suture. This fine micro- 

 pubescence extends as a rather wide marginal band 

 along the sides of the mesonotum and medial to the 

 postalar callosity. Viewed from above it is quite white, 

 almost bluish white. Pile of mesonotum abundant, 



