44 AUSTRALIAN TABANIDjE, iv., 



There is a striking similarity between S. elongatulus and the 

 specimens described as var. persimilis, so much so that the above 

 distinctions do not appear to warrant their separation as distinct 

 species I omitted to state, in describing »S. elongatulus, that 

 the front is nearly twice the width anteriorly than posteriori v. 



SlLVIUS ANGUSTICAf.LOSUS, Sp.n. 



9. Length, 95; width of head, 3; length of wing, 10 mm. 



A small, slender, black and yellowish species. Frontal callus 

 a narrow line reaching the ocelli; legs black, tibia? yellowish: 

 wings yellowish-brown, basal cells clear. Abdomen with first 

 three segments 3'ellowish-brown, darker in the middle. Eyes 

 pubescent. 



Head : face and cheeks with blackish tomentum, grey toward 

 sides of cheeks; pubescence black, interfacial cheek-grooves deep; 

 beard black and grey, scanty ; eyes with scanty pubescence; 

 front narrow, slightly narrower at the vertex; tomentum grey, 

 yellowish-brown in the centre; pubescence dark; frontal callus 

 black, consisting of a narrow line from the subcallus to the ocelli; 

 subcallus black, tomentum grey ; palpi as long as proboscis, 

 reddish, tomentum grey, pubescence black, pale at base; first two 

 joints of antennae yellowish, pubescence pale, third joint reddish- 

 yellow, the three apical annuli blackish. 



Thorax chocolate-brown with grey tomentum [somewhat de- 

 nuded], pubescence pale ; scutellum similar ; pleura? black, 

 tomentum and pubescence grey. 



Abdomen: first three segments pale yellowish-brown on the 

 sides, less so on first segment, blackish-brown elsewhere, the 

 remaining segments black, segmentations pale on all segments, 

 with pale pubescence, black elsewhere: venter pale, blackish 

 towards apex, pubescence pale. 



Legs black, basal half of fore- and midtibia? yellowish-brown, 

 hind darker, coxal pubescence pale, black elsewhere. 



Wings yellowish-brown, darker on fore-border ; except the 

 discal, inferior basal, anal, axillary, and bases of the fourth and 

 fifth posterior cells, which are clear, the veins of these cells are 

 faintly clouded, the veins blackish-brown; stigma blackish-brown; 

 no appendix. 



