64 THE DIPTEEA-BRACHYCERA OF TASMANIA, 



which does not seem to reach its full development until the- 

 insects have been for some time on the wing. Legs : all' 

 tibiae bear two spurs, but one of those on the anterior pair 

 is verv short. Wings with the three basal cells considerably 

 lengthened ; the diagonal vein situated towards the tip of 

 the wing; the mediastinal and subcostal veins reacli the 

 costa considerably before the wing tip, which is occupied by 

 onlv four short veins ; fourth posterior cell closed, produced 

 downwards, and joined by a short veinletto the wing margin. 

 This genus contains only a single species, which is confined 

 to Tasmania. 



EXERETONETJRA MACULIPENNIS Macq. (Fig. 8). 



Thorax grey with three dark longitudinal stripes ; abdomen 

 black, with hind margins of 2ud, 3rd, and 4th segments 

 white or yellow; legs olive; wings hyaline, mottled with 

 dark brown across the centre, and towards the tips. 



Length. Male. 13.5-14 mm.; female (excluding ovipositor) 

 12.5-14 mm., (including ovipositor) 15-17 mm. 



Hab. Bagdad Valley. 



Male Proboscis barely projecting from the oral aperture^ 

 which is extremely large, occupying the greater part of ths 

 face ; sides of iface covered with thick yellowish-white 

 pubescence, and, directly adjoining the eyes, with long black 

 hairs. Front extremely broad, with a pronounced ocellar 

 protuberance, tXirk giey, paler at sides and directly above the 

 antennae, the whole covered with black hairs, which are 

 especially dense at the vertex. Eyes bare, very widely 

 separated. Antennae as noted in the generic characters, 

 the first joint grey, second reddish, third black. Thorax grey, 

 with thiee black, longitudinal, central stripes, the middle one 

 short and narrow, the side ones broad and reaching to the 

 scutellum ; sides of thorax white, the whole covered with 

 black hairs and a little yellow or white pubescence ; scutellum 

 grey with the tip red, or grey generally suftused with red, the 

 whole bearing long black hairs. Abdomen dis,tinctly flattened,, 

 velvety-black, with hind margins of second, third, and fourth 

 segments l»earing pale yellow pubescence, so that the abdo- 

 men appears to be black with incisions of segments yellow; 

 dorsum and sides of abdomen with a little inconspicuous- 

 yellow pubescence. Legs olive, with short dense pubescence, 

 all tibi^ with two terminal spurs, but on the anterior tibiae 

 one of the spurs is very short. Wings hyaline, mottled with 

 dark brown across centre and towards the tips. 



Female bears a very close resemblance to the male, but the 

 front is lighter in colour, and both front and thorax less- 

 bairv. 



