the Asilitlaj of Australasia. 1G5 



grey, the hitter with l)lack bristles above. Abdomen with 

 grey pubcsceuee. Jl'uif/s j)a]e smoky. Legs testaceous^ 

 femora and tibiic with a biaek stripe on outer border. 

 Length 15 mm. 



Ommatius mackayi, sp. n. 



Type (c? ? ) from Maekay, Queensland (G. Turner, 1894). 



A handsome yellowish speeies, with well-marked blackish 

 stripes on tliorux. Legs black, femora at base and tibiae 

 "wholly yellow. Wings hyaline, in male dilated. 



Length, S 26, $ 20 mm. 



Male. — Face blackish, with silvery white tomentum ; 

 tubercle not very prominent. Moustache reaching to quite 

 the middle of face, which narrows considerably above, com- 

 posed of long bristly white hairs, four long yellowish bristles 

 conspicuous above. Palpi small. Beard white. Antenna 

 brownish, with the usual long feathered bristle. Forehead 

 yellower than face; ocelligerous tubercle large, brown, with 

 some yellowish bristles. Head much excised behind, the 

 hairs at back yellowish. Thorax covered with bright fulvous 

 tomentum, lighter on the shoulders, and marked with two 

 central narrow^ black stripes and with shortened side-stripes ; 

 a few short black bristles appear in centre of dorsum ante- 

 riorly and some long fulvous hairs posteriorly ; sides with 

 pale yellow hairs and two strong black bristles above base of 

 wing, two more below ; breast-sides brownish, with white 

 tomentum. Scutellum fulvous, bordered with some yellowish 

 hairs. 



Abdomen brownish, with bright fulvous tomentum on the 

 first tw^o segments; all segments with short, fairly thick, 

 fulvous pubescence. Genital organs very prominent, 

 blackish, sides with yellowish hairs, a tuft of long fulvous 

 hairs on the first segment. Legs black, the coxse covered 

 M'ith grey tomentum, the fore pair with long white hairs ; 

 the femora yellow below, the hind femora yellow at base ; 

 tibicC yellow, hind pair black at apex; tarsi yellow on the 

 first joint of fore and mid pair ; pubescence of legs yellowish, 

 bristles black. Wings much dilated on costal border, 

 strongly rilled in the marginal and submarginal cells and 

 less so in the first and second posterior cells ; the small trans- 

 verse vein beyond the middle of discal cell ; veins brown. 



Female identical ; the stout bristles in moustache are 

 darker in colour, hairs at back of head black and bristly, the 

 bristles below base of wings are more in number. IVings 

 not dilated and hardly rilled. 



