160 



UNITED STATES NATIONAL MUSEUM BULLETIN 2 24 



ventral bristles. At the apex it bears one long, strong, 

 ventral, 1 anterior, 1 anteroventral, 2 dorsal, and 1 

 posterior bristle. Anterior femur with 3 posterior and 

 3 anterior bristles. Anterior tibia with 5 posterior, 3 

 ventral, a double row of 4 or 5 dorsal bristles ; and the 

 apex with 2 long, stout, divergent, ventral bristles and 

 also 1 posterior, 2 dorsal, and 2 anterior bristles; the 

 apex simple. Claws long, curved, sharp. Pulvilli four- 

 fifths the length of the claws and transversely ribbed or 

 striate. Empodia stout, extremely sharp and attenuate 

 on the apical half, not quite reaching the end of the 

 pulvilli. 



"Wings: The venation is similar to Microstylum in 

 most respects. The first posterior cell is closed with a 

 long stalk. The second posterior cell is recurrent dor- 

 sally at the base and connected with the discal cell at 

 one point only. Alula present, the ambient vein ends 

 at the end of the submarginal cell. 



Abdomen : The abdomen is cylindrical and tapering, 

 sides of the first tergite with a transverse cluster of 15 

 short, stout, black bristles ; the base of the second ter- 

 gite laterally behind has a broader cluster of as many 

 bristles, slightly less stout; remaining tergites without 

 bristles laterally but with appressed, fine, black setae. 

 Male terminalia large and conspicuous. 



Genus Mimoscolia Enderlein 



Figures 954, 963 



Mimoscolia Enderlein, Wiener Ent. Zeitung, vol. 33, p. 168, 

 1914. Type of genus: Mimoscolia fafner Enderlein, 1914, 

 by original designation. 



Giant flies of exceptionally robust aspect, distin- 

 guished from the Microstylum Macquart chiefly by their 

 stout form and by the stout distal spinous process at the 

 end of the middle tibia. A small group of Chinese 

 and Malagasy species belong here. Length 30 to 50 

 mm. 



Head: The head is like Microstylum, the proboscis 

 rather longer. There are one or two transverse grooves 

 across the face above the epistoma, the third antennal 

 segment is of uniform thickness or slightly dilated dis- 

 tally. Sides of the front with a vertical row of very 

 stout bristles. The head is short, the eye especially 

 short, high and flattened. 



Thorax: The mesonotum is wide and stout, often 

 pale pollinose, sometimes striped and has scattered 

 short, stout setae. Humerus thickly beset with stiff 

 pile and some weak bristles, or with numerous, very 

 stout bristles and some short or slender ones. The 

 lateral complement of stout bristles contains a cluster 

 of 5 or 6 posthumeral, and an oblique row of 4 noto- 

 pleural, 3 supraalar, 3 or 4 postalar, and 2 or 3 pairs 

 upon the scutellum. Thorax otherwise very similar to 

 Microstylum. Postmetacoxal area membranous. 



Legs: All the femora are stout; only the anterior 

 four a little swollen towards the base. Pile of legs 

 appressed, setate and dense, the bristles numerous, con- 

 spicuous and very stout. In general the legs are simi- 



lar to Microstylum; however, it may be noted that 

 there tends to be an unusual development of the 

 bristles in clusters of stout elements; these are gen- 

 erally situated on the posterior basal half of the an- 

 terior femur on its basal and ventral surfaces or 

 especially along the middle of the anterior surface of 

 the middle femur, which may have a rather close 

 cluster of 12 spinous bristles. Tibia not unusual ex- 

 cept at the apex of the middle tibia; here there is a 

 stout, conspicuous lobe bearing 4 or 5 spinelike bristles. 

 The bristles are greatly reduced along the anterior and 

 ventral surfaces of the middle tibia. Claws stout, only 

 a little sharpened at the apex; pulvilli long; the em- 

 podium bladelike. 



Wings : The venation is similar to Microstylum,. 



Abdomen : The abdomen is conspicuously robust and 

 strongly tapered, sometimes shortened ; at the base it is 

 as wide as the mesonotum. Male terminalia rotate 

 one-half; the epandrium is cleft to the base and over- 

 laps the base, with long, distal, divergent processes; 

 the gonopod is large, the hypandrium prominent, elon- 

 gate, convex, with a distal undivided process and ex- 

 tended downward as a medial flange. Females with 

 the usual spines, about 8 pairs. 



Distribution: Palaearctic: Mimoscolia fafner Ender- 

 lein (1914) ; ooerthurii Wulp (1896) ; vulcan Bromley 

 (1928). 



Ethiopian: Mimoscolia cilipes Macquart (1838); 

 hUdebrandti Karsch (1885) ; luciferoides Bromley 

 (1942) ; radamae Karsch (1884). 



Genus Daspletis Loew 



Figures 136, 168, 485, 9S8, 997, 1841, 1949 



Daspletis Loew, Of vers. Svenska Vet.-Akad. Forhandl., vol. 15, 

 p. 3.37, 1859. Type of genus: Daspletis vulpes Loew, 1859, 

 by monotypy. 



Rather large flies related to Microstylum Macquart 

 with the lateral metanotum bristly. They are readily 

 recognized by the closed first posterior cell with its 

 long stalk. The bristles and bristly pile are con- 

 spicuously developed, the face bristles are very long 

 and stout and extend over the entire length of the face. 

 Dorsal bristles of upper occiput often remarkably long. 

 These flies tend to be blackish with pale colored pollen 

 and yellow or red bristles and pile. Length 18 to 25 

 mm. 



Head, lateral aspect : Face rather strongly produced, 

 beginning shortly beneath the antenna; it is rounded, 

 gibbose and abrupt dorsally. The eye is rather short, 

 gently convex anteriorly and also posteriorly with the 

 ventral three-fifths strongly recessive anteroventrally. 

 The occiput is only moderately thick but more promi- 

 nent medially, the slope to the eye margins gentle. Pile 

 of occiput quite dense and long, pale and opaque on the 

 lower half of the head, becoming shorter and more 

 scanty through the middle where it is partly replaced 

 by weak, short bristles. Dorsal bristles longer, some- 

 times proclinate and frequently of exaggerated length 



