DA8YP0G0NINAE 



ROBBER FLIES OF THE WORLD 



59 



robust. Femora and tibiae with dense, conspicuous 

 brushes of pile ; these are found on the ventral surface, 

 on the dorsal apices of the femora, and on all sides of 

 the tibiae. The genus belongs to the Damalini and is 

 related to Orrhodops Hull, differing in size, pile, vena- 

 tion, character of the legs, and other particulars. 

 Length 18 mm. 



Head, lateral aspect: In profile the face does not 

 extend beyond the eye, the entire head is short on the 

 dorsal half, much more extensive below. The eye facets 

 on the entire upper half are remarkably enlarged and 

 there are approximately three divisions, as shown by a 

 faint, oblique crease on the lower part of the eye, the 

 middle division being comparatively narrow, trans- 

 verse, and attenuate laterally. The occiput is promi- 

 ment only towards the middle and below, receding 

 laterally towards the eye margin, and rather densely 

 covered with coarse, long hairs, with bristles absent. 

 Proboscis quite short, directed obliquely downward, 

 almost transverse at the broad apex, which is punctate 

 and bears coarse, apical, ventral and lateral hairs. 

 Near the middle it is marked off by a transverse crease, 

 and the base below and laterally bears considerable long 

 pile. Palpus clearly of two segments, with the second 

 segment large, elongate, spindle shaped and bearing 

 numerous, almost spikelike bristles on all sides. 

 Antenna relatively short, the first segment a little 

 longer than the second, the second about as long as high, 

 and the almost subcircular third segment approximately 

 as long as the first but of greater depth or breadth. It 

 bears a long, somewhat thickened arista, or style, which 

 in length is about iy 2 times the total length of the three 

 segments. At base of antenna is an extremely small 

 microsegment. First and second segments with a sub- 

 medial circlet of stiff bristly hairs, which include one or 

 two slender bristles below. 



Head, anterior aspect : The antenna is set at the mid- 

 dle of the head, and the face below the antenna is 

 strongly divergent, with the lower half strongly con- 

 vex as in rhagionids and lower Brachycera with deep, 

 conspicuous, lateral creases. Whole face covered with 

 rather abundant, erect, coarse, bristly hairs which in 

 length equal the first two antenna! segments. Front 

 without pile but pollinose above the antenna. Ocellar 

 tubercle large, prominent' with vertical sides and with 

 large, protrusive ocelli, the anterior element being espe- 

 cially protrusive and swollen. Middle of ocellar and 

 the posterior border with abundant, moderately long, 

 coarse pile. 



Thorax: Mesonotum rather high and arched, to- 

 gether with the convex scutellum and the humerus 

 densely covered with slightly recumbent, pale pile 

 largely concealing the opaque or pollinose ground 

 color. Mesopleuron along the upper and posterior 

 borders widely and densely pilose, the pile long and 

 dark. Pteropleuron without pile but almost the whole 

 of the convex metapleuron with dense, long, conspicu- 

 ous, dark pile. Metanotum without pile. 



Legs : All femora and tibiae and basitarsi, especially 

 the hind basitarsus, exceptionally stout and prominent, 



and covered with dense fringes of coarse, black, bristly 

 pile. Pile of the tarsi more or less reddish golden, 

 and their ground color brownish orange. The ground 

 color of the femora and tibiae very dark, reddish sepia, 

 but blackish in general due to the black pile. Pulvilli 

 well developed and broad; claws stout, only moderately 

 sharp at the apex, the empodium unusually swollen at 

 the base. 



Wings : The wings dark and everywhere villose and 

 rather broad at apex as well as at base. Veins ar- 

 ranged as given above. 



Abdomen : The abdomen is quite broad and is droop- 

 ing, shining, and largely bare along the base of the 

 tergites, with short pile over the middle of the poste- 

 rior part which becomes dense and longer laterally and 

 of increasing density on the more basal tergites. All 

 posterior margins widely pollinose. Seventh and 

 eighth tergites considerably narrowed, subcylindrical 

 but only a little shorter than the preceding tergites. 

 Ninth tergite shorter, divided medially almost to the 

 base. 



Distribution: Nearctic: Bromleyus flavidorms E. 

 Hardy (1944). 



Genus Lasiodamalis Hermann 



Figubes 26, 432, 827, 836 



Lasiodamalis Hermann, Verh. zool.-bot. Ges. Wien, vol. 74-75, 

 p. 174, 1926. Type of genus : Damalis capensis Wiede- 

 mann, 1828, by original designation. 



Rather small flies with a broad, flattened abdomen 

 at least as wide as the mesonotum and with the meso- 

 notum quite short, no longer than wide. The head is 

 broad but not as wide as in Holcocephala Jaennicke. 

 Length 10 mm. 



Head lateral aspect: The face is rather protuberant 

 and convex and the antenna is set within a shallow, 

 transverse depression. The proboscis is robust and 

 short, very little longer than the face; it is strongly 

 compressed laterally on a little more than the outer 

 half; the base is rather strongly swollen particularly 

 from a dorsal view. The apex is blunt but a little 

 roimded dorsally and the whole proboscis directed 

 obliquely forward. The palpus is short and robust ; the 

 second segment is especially large and cylindrical, very 

 slightly narrowed near the apex which bears several 

 long, slender, bristly hairs. First segment minute and 

 extremely short. The antenna has the first 2 segments 

 very short; second segment with a long, slender, ven- 

 troapical bristle. The third segment is considerably 

 more narrow than the second, a little swollen and pyri- 

 form at the base and drawn out apically into a long, 

 fine style. 



Head, anterior aspect : The face rather strongly pro- 

 tuberant, without transverse grooves. It rises gently 

 beneatli the antenna and retreats on the lower fif tli ; it 

 is densely covered with long, bristly pile which extends 

 ventrally to the eye margins and densely down the 

 upper half of the lateral margins of the subepistoma ; 



