New Australian Tabanidae. 23 



This species may be distinguished from its nearest congeners, 

 T.tasmanicus and T.dixoni, by the frontal callus; the forehead 

 is also very much narrower than in T. dixoni. The shading of 

 the wing veins varies considerably, and in some specimens the 

 wings appear quite hyaline. 



Type in National Museum, Melbourne. 



Tabanus dixoni, n. sp. (Plate II., Fig. 6). 



A small species allied to T. postponens, but with much broader 

 forehead. 



£ Long, 10.5 mm., width across head 4.5 mm., wing 9.5 mm. 



Face and cheeks light reddish yellow, covered with grey tomen- 

 tum and with scanty whitish pubescence ; beard white. Palpi 

 slender, a little stouter at base, yellow with long white pubes- 

 cence at base, and a few short dark hairs elsewhere. Antennae 

 with first two joints yellow, broadly dilated and angulate above; 

 annuli black about as long as basal portion. Subcallus yellow- 

 ish brown or reddish yellow, much denuded, in other specimens 

 covered with grey tomentum. Forehead broad, hardly more than 

 twice as long as wide, parallel sided ; reddish yellow, clothed with 

 grey or yellowish grey tomentum, and with scattered short black 

 hairs ; callus reddish yellow, small, inconspicuous, about one- 

 third the width of front, tapering to a point, and with a lineal 

 extension to middle. Eyes with rather short, fine pubescence. 



Thorax black, shoulders reddish grey, clothed with grey tomen- 

 tum, leaving indistinct indications of three black stripes separated 

 by grey lines ; with sparse decumbent golden pubescence and 

 long erect black hairs, with scanty tufts of grey hairs above 

 wing roots ; shoulders with long dark hairs ; sides reddish grey 

 with long grey pubescence. Scutellum black with grey tomen- 

 tum. Abdomen .black, segmentations pale grey, dilated in centre 

 to form a row of triangular spots on segments two to six, second 

 segment bordered with grey at base ; pubescence decumbent black, 

 pale creamy on segmentations and on the median spots. Venter 

 pale reddish yellow, somewhat darker at apex, clothed with 

 grey tomentum with scanty short dark hairs, intermingled with 

 creamy ones. 



Legs pale reddish yellow, anterior tarsi black, the others dark 

 reddish brown ; 'femoral pubescence pale, posterior tibiae with 

 rather sparse brown hairs. Wings clear, costal cell pale brown, 

 veins brown, stigma brown distinct, appendix present. 



Hab. : — Victoria, Lake Hattah (near Murray River), (J. E. 

 Dixon, Nov., 1918); Mallee (J. E. Dixon, October, 1918). 



