810 AUSTRALIAN TABANIDiE, i., 



Legs : fore-femora dark reddish-brown, dusky in some lights, 

 tibiae with the basal half light brown, remainder and first four 

 tarsi dusky, fifth tarsals brown; mid- and hind-femora reddish- 

 brown, apices paler, tibiae light brown, apices darker; tarsi 

 brown, in some lights dusky; femora clothed with brown hairs, 

 tibiae and tarsi with black; mid-tibial spurs long, on the hind 

 short and inconspicuous. 



^a6.— Howard Creek, Northern Territory (G. F. Hill; No.58). 



Described from a single specimen, presented to the Institute 

 by Mr. Hill. This species is related to S. sordidus mihi. The 

 abdomen is wider, however, than the thorax, whereas, in the 

 latter species, it is uniform in width. The abdomen has an 

 opalescent sheen, which is lacking in S. sordidus mihi. 



SiLVIUS FULIGINOSUS, Sp.n. 



9. Length, 11*2; width of head, 4-2; width of front at vertex, 

 0'7; length of wing, 9-2 mm. 



Head dusky, clothed with grey hairs beneath, subcallus 

 denuded, shining-black; front a dirty-brown; ocelli deep brown; 

 frontal callus sliining-black, more or less quadrate, with the 

 upper angles rounded; palpi dark yellowish-brown, with truncate, 

 dusky apices, about two-thirds the length of the proboscis; 

 antennae reddish-brown, the distal end of first segment swollen, 

 about twice the diameter of the base, second segment very short, 

 both segments clothed with black hairs, third segment with the 

 base broadly triangular; proboscis black; eyes blue-black, with 

 coppery reflections, their inner margins converging towards the 

 base. 



Thorax dark brown, covered with grey bloom, with four, longi- 

 tudinal stripes, two submedian, the others lateral, clothed with 

 short, golden hairs, with a prealar border of mixed grey and dark 

 hairs; pleurae and pectus slaty-grey, clothed with grey hairs; 

 scutellum slaty-grey. 



Abdomen black, clothed with black hairs, segments two to four 

 with the apical edges pale, clothed with pale hairs, segments 

 three to six with traces of white, median, apical spots; venter 

 with the first two segments dusky-brown, remaining segments 



