DASIPOGONINAB 



ROBBER FLIES OF THE WORLD 



249 



2 anterior bristles along the middle and 1 posterodorsal 

 subapical bristle; ventral surface with a short, basal 

 bristle and almost no pile. This tibia has 2 short antero- 

 dorsal on the basal half and 2 long stout ones, 1 before 

 the middle, 1 at the outer fourth, and 4 quite short 

 posterodorsal, 2 or 3 short posteroventral, and 2 long, 

 stout ventral bristles. Anterior femur without bristles ; 

 this tibia has 4 short anterodorsal on the basal half, 

 4 posterior bristles distributed throughout, 4 short 

 posteroventral bristles, and 1 long conspicuous ventral 

 bristle on the outer fourth. Apex -with a well devel- 

 oped, curved, pointed, slightly sigmoid spine. The 

 basitarsus has a row of nodules. All the basitarsi 

 elongate and slender, the hind pair as long as the fol- 

 lowing three segments. Anterior pair only as long as 

 the first two segments. Fourth anterior tarsal seg- 

 ment shortened; all tarsi end in slender, sharp claws 

 curved from the base; long pulvilli and basally stout, 

 bladelike empodium, a little more than half as long as 

 the claw. 



Wings: The marginal cell is open by less than its 

 maximum width; anterior branch of third vein ends 

 almost at the apex ; posterior branch ends considerably 

 to the rear; all the posterior cells widely open, the 

 fourth is narrowed to two-thirds its maximum width. 

 Anal cell narrowly open ; second basal cell ends in two 

 veins, alula wide, ambient vein complete; the anterior 

 crossvein enters the discal cell a little beyond the middle. 

 The entire wing is villose and pale brownish orange. 



Abdomen: The abdomen is robust, basally about as 

 wide as the mesonotum and rather strongly tapering 

 from the end of the third tergite with parallel sides 

 before this. In the female there are eight tergites, but 

 the last three are vitreous instead of dully pollinose. 

 The eighth tergite is two-thirds as long as the seventh, 

 the seventh four-fifths as long as the sixth, and this part 

 of the abdomen is rather strongly cylindroid. Pile of 

 the abdomen dense, flat appressed. Only the sides of 

 the first tergite have fine, long, bristly pile; laterally 

 and transversely this tergite has 10 rather short, but 

 quite stout bristles. Male terminalia not rotate, quite 

 elongate, both the superior forceps and gonopod prom- 

 inent; there is no exposed hypandrium so that the in- 

 terior cavity is left quite exposed. Female terminalia 

 with 6 pairs of unusually spatulate, apically rounded, 

 spoonlike spines and possibly with 1 or 2 ventral, acces- 

 sory bristles but mostly short, bristly hairs. 



Distribution : Australian : Rachiopogon grantii New- 

 man (1857) ; nigrinus Hardy (1926). 



Hardy (1934) believed White's species Metalapkria 

 aurifacies belongs here. 



Genus Deromyia Philippi 



Figures 147, 532, 1089, 1098, 1839, 1S44 



Deromyia Philippi, Verh. zool.-bot. Ges. Wien, vol. 15, p. 705, 

 1865. Type of genus: Deromyia gracilis Philippi, 1865. 

 Designated by Williston, 1901. 



Small or medium size slender flies which differ from 

 Diogmites Loew with which they have been confused 



by many authors in a number of particulars. As 

 Bromley has pointed out, they tend to resemble the 

 Ethiopian Neolaparus Williston in general appearance 

 and their real relationship is still uncertain. The third 

 antennal segment is rather strongly dilated, compara- 

 tively short, with conical, attenuate microsegment. 

 The palpus is elongate, slender and clavate apically. 

 Face nearly apilose, with only 2 or 3 bristles above the 

 epistoma. These are very bare flies of reduced pile, 

 and closed and stalked fourth posterior cell. The long, 

 slender hind femur is clavate. Length 12 to 18 mm. 



Head, lateral aspect : The head is of moderate length, 

 the face is short throughout, but slightly more promi- 

 nent above the epistoma; its height also is distinctly 

 reduced. The occiput is poorly developed, although 

 gradually becoming more prominent medially, and like- 

 wise ventrally due to the recession of the eye. The 

 pile of the occiput is loose, scanty, fine ventrally, with 

 slender bristles beginning below the middle of the head 

 and on each side above with a deepset, postvertical 

 cluster of 3 containing at least 1 quite stout bristle and 

 may be reduced in quantity to this one element. Pro- 

 boscis of moderate size but distinctly compressed later- 

 ally and bluntly rounded at the apex. Palpus of two 

 segments, the first minute and short and excavated, the 

 second elongate, slender, clubbed at the apex and bear- 

 ing an apical tuft of fine bristles on all sides. The 

 antenna is attached at the upper third of the head, 

 shorter than the total head length, the first two segments 

 short, subequal, with numerous long, bristly setae above 

 and below the third segment about as long as the first 

 two combined. This segment is strongly dilated in 

 the middle and bears a short, conical microsegment with 

 spine and dorsally 3 or 4 small bristles or setae. 



Head, anterior aspect : Width of head moderate, the 

 face wide, with parallel sides, not quite one-third the 

 head width, densely pubescent with 5 or 6 fine, short 

 hairs on either side and above the epistoma 1 row of 2 

 pairs of moderately long, stout bristles and sometimes 

 a feAV fine hairs. Subepistomal region unusually long 

 and oblique. Front distinctly wider than the face be- 

 low antenna, convergent at apex, short and pollinose, 

 with several fine bristles on either side. Vertex verti- 

 cally excavated on either side, the prominent ocellarium 

 has vertical sides, without bristles except behind the 

 ocelli where they are small. 



Thorax : The thorax is pollinose, the pile extremely 

 reduced to a very few fine, scattered, bristly hairs. 

 There are no acrostical elements but there are fine 

 differentiated dorsocentral bristles or bristly hairs 

 which become a little longer posteriorly. The lateral 

 complement of bristles contains no humeral bristles, 

 1 or 2 notopleural, 1 supraalar, 1 postalar, and no 

 scutellar bristles. Propleuron with only fine, scattered 

 hairs. Metapleuron with a vertical row of fine hair 

 only. All remaining pleural areas with or without a 

 few fine, scattered hairs. Hypopleuron with a suberect, 

 conspicuous patch of setae. Metastemum unusually 

 elongate and prominent, ventral portion pollinose, both 



