DASYP0G0N1NAE 



ROBBER FLIES OF THE WORLD 



287 



Base of all the tibiae pale yellow, especially dorsally. 

 Pile of all the legs scanty, yellowish white, fine, varying 

 from erect near the base of the femora to subappressed 

 distally on the femora. Bristles numerous, stout and 

 black, but sometimes there are 2 reddish, dorsal bristles 

 on the apical half of the hind tibiae and the medial 

 bristles of the hind femur are reddish. The hind femur 

 has 4 black bristles laterally, 3 ventrally, and 2 reddish 

 bristles medially, besides a black, dorsomedial bristle 

 at the apex. 



Wings: The wings are nearly hyaline, except the 

 anterior border, which is reddish brown and this color 

 fills out the entire costal, subcostal, marginal, and sub- 

 marginal cells and becomes somewhat lighter in the first 

 basal cell. There is a still darker spot of reddish brown 

 which fills out the entire apical portion of the first basal 

 cell and slightly beyond, also the base of the discal cell, 

 a tiny portion at the base of the fourth posterior cell, 

 and narrowly along the apex of the second basal cell. 

 Also this darker, reddish brown color fills out the whole 

 of the second submarginal cell except the apex and 

 narrowly borders the anterior half of the first posterior 

 cell, beginning at the fork of the third vein. 



Abdomen: The abdomen is rather dark reddish 

 brown, shining, bare over much of the surface but with 

 thin, golden pollen over almost the whole of the fourth, 

 fifth and sixth tergites and with a narrow band of dense, 

 coarse, brownish yellow micropubesenee along the post- 

 margin of the second to sixth tergites, most extensive at 

 the end of the third tergite and moderately extensive at 

 the end of the fourth tergite. There is a trace of 

 pubescence in the middle of the first segment. Sides 

 of first tergite ■with 1 reddish bristle and a few, fine 

 haire. Spines of acanthophorites short and reddish. 



Type. Male, allotype female from Acacia Eidge, 

 Brisbane, Queensland, Sept. 23, to Oct. 3, 1953. Para- 

 types 4 males, paratypes 3 females with the same data. 

 Collected by F. M. Hull. In the collections of the 

 author and 1 paratype in the collections of the Common- 

 wealth Scientific and Industrial Eesearch Organization, 

 Australia. This species is named in honor of Dr. A. J. 

 Nicholson, C.S.I.E.O., Australia. 



Genus Erythropogon White 



Figures 143, 575, 582, 1162, 1171, 1732, 1843, 1902, 2021, 2057 



Erythropoqon White, Papers Proc. Roy. Soc. Tasmania, 1913, 

 p. 270, 1914. Type of genus: Erythropogon ichneumoni- 

 forinis White, 1914, by original designation. 



Flies of moderate size with the abdomen strongly 

 constricted at the basal third and clavate beyond, the 

 wings rather slender. They will be recognized by the 

 extremely long and slender antenna, which is placed 

 at the top of the head. The face is high and •well 

 developed and plane, or very slightly convex over the 

 middle part, and produced below into a medially nar- 

 rowed, short, ventral process. Anterior tibia with a 

 weak, straight, apical, pointed spine and its basitarsus 

 with microdenticles. Legs elongate. These flies are 



related to Brachyrrhopala Macquart. Length includ- 

 ing antenna 21 mm. 



Head, lateral aspect: The head is longer than usual, 

 the face rather strongly developed above and below and 

 plane in profile, except for a short stubby protuberance 

 ventrally. Eyes normal, slightly recessive below and 

 very strongly convex in front; they are only a little 

 less convex posteriorly. The occiput is thick, obliter- 

 ated only near the vertex and becomes especially prom- 

 inent below the middle. The pile is very scanty and 

 consists of only a few hairs in a submedial row ; weak 

 bristles begin at the middle and consist of some 16 

 pairs. The proboscis is decidedly slender, subcylin- 

 drical, slightly thickened at the base, the height in- 

 creased by a strong, dorsomedial, crimped ridge; the 

 apex is gently tapered but obtuse, with fine hairs. The 

 base has only a few long hairs below. The structure 

 is held nearly straight forward. Palpus clearly of two 

 segments, the first segment excavated, the second porate. 

 The pile is fine and long, with some subapical bristles. 

 Antenna attached at the upper eighth of the head and 

 extremely elongate and slender, fully 2y 2 times as long 

 as the head. The first segment is nearly twice as long as 

 the second, the third three times as long as the first two 

 combined. The third segment is somewhat laterally 

 convex towards the base, dorsoventrally compressed 

 towards the apex. It has nearly parallel sides though 

 perhaps slightly wider beyond the middle and at its 

 apex bears a short, rounded, spoon-shaped microseg- 

 ment containing a minute spine obscured by dense pu- 

 bescence. The entire outer half of the third segment 

 laterally has a long, dense fringe of pubescence. The 

 antenna has very little pile, restricted to 5 or 6 fine 

 setae laterally upon the first segment. Both first and 

 second segments, especially the second, are strongly 

 compressed laterally. 



Head, anterior aspect : Face below the antenna about 

 one-third the head width and with nearly parallel sides. 

 Subepistoma rather short, horizontal, deeply concave 

 with medial ridge. The face is pubescent on an oblique 

 band from antenna to eye, lateral margins, a narrow 

 medial band, a narrow band from eye to epistoma and 

 the remainder bare, transversely striate and bearing a 

 few, fine, scattered, moderately long hairs. The lower 

 facial protuberance bears 4 stout, pale bristles barely 

 longer than the second antennal segment. The front 

 is very slightly divergent, the vertex of scarcely less 

 •width. The front is tumid and bears 6 or 8 long, fine 

 hairs. Vertex moderately excavated; ocellar protuber- 

 ance large, the large ocelli visible in profile, the protu- 

 berance bearing 3 or 4 pairs of fine hairs. The eye 

 facets are considerably enlarged on a narrow, medial, 

 central area but not zoned. The eyes extend well below 

 the face but not below the cheeks. 



Thorax: The thorax is more or less pollinose with 

 scant pubescence; the pleuron also has very limited 

 pubescence. The mesonotum is rather flattened over the 

 middle, its pile minute, fine, setate and subappressed. 

 There is an acrostical row present followed by a bare 

 stripe. Dorsocentral elements sparse, no longer behind 



535914 — 62— pt. 1- 



-20 



