AUSTRALIAN BLOOD SUCKING FLIES. 239 



broadened, almost as wide as long, somewhat concave on 

 its inner surface, produced into a short stout arista, not 

 quite as long as the rest of the antenna. Thorax yellowish- 

 brown, sides and anterior margin with a greyish bloom, 

 with three darker longitudinal lines, not quite reaching 

 base, the median line slightly narrower and not extending 

 quite as far as the others. Abdomen dark brown, the basal 

 segment lighter, each segment with a narrow light yel- 

 lowish-brown apical border, the apical segment almost 

 entirely of this colour. Ventral surface yellow. Legs 

 pale yellow, tarsi with first joint infuscate at apex, the 

 other joints dark, intermediate tibiae with two apical spurs. 

 Wings with venation characteristic of genus, the third 

 veinlet very short or absent, the angulation below variable; 

 hyaline, veins and stigma dark brown. Length 3 mm.; 

 antennae *55 mm., third joint '17 X *14 mm., arista *26 mm. 



Hab. New South Wales, Milson Island (Hawkesbury R.) 



This species was taken on two successive days, April 

 10th and 11th, and was not noticed a week previous or a 

 week after this date. It is the smallest species known, 

 and can readily be distinguished by the combination of 

 small size, yellow legs and yellow venter. The species 

 was fairly abundant when taken and was noticed to be 

 attacking cattle on the island. About thirty specimens 

 were taken, but unfortunately almost all turned black after 

 being pinned. 



Spaniopsis marginipennis, n. sp. 



Plate XXVI, figs. 2, 4, 8. 



? Similar to 8. tabaniformis, but with wings infuscate 

 along outer portion of anterior margin. Thorax brownish 

 with three darker longitudinal lines; abdomen dark, with 

 paler apical bands; venter yellow; legs yellow, tarsi 

 infuscate. 



