GERTRUDE RICARDO. DIPTEREN II. 399 



white, very noticeable viewed from behind. The abdomen is redder in colour with pale 

 segmentations on the underside. The legs are redder ■ yellow. The beard usually whitish, 

 appears brownish in some spécimens from New Guinea and Misol. 



A médium sized reddish or reddish yellow species with a narrow forehead. Antennae 

 and legs yellowish. Length 16 m. m. type, others 18 — 19 m. m. The types hâve a more 

 yellowish appearance owing to denudation and are not in good condition. The following 

 description is based on the fresh spécimens. 



Face and lower cheeks covered with greyish tomentum, the subcallus and sides of upper 

 cheeks with more reddish brown coloured tomentum. Palpi yellow with black pubescence, 

 large and stout, ending in a long point. Beard greyish white. Antennae light reddish yellow, 

 the last four divisions of the third joint blackish, the first two joints with black hairs, the 

 third joint with a distinct tooth. Forehead narrow, about eight times as long as ît is broad 

 and a third narrower anteriorly, the frontal callus long and narrow, not reaching eyes, its lineal 

 extension long, the colour of the callus yellowish or reddish, that of the lineal extension 

 usually blackish. Thorax brown with very indistinct traces of stripes, covered with some 

 greyish tomentum and some appressed fulvous hairs, and with short black pubescence which 

 is longer on the sides ; breast covered with grey tomentum and with black hairs, anteriorly 

 with white hairs. Scntellum saine as thorax. Abdomen reddish appearing darker by reason of 

 the short rather dense black pubescence on its dorsum, in the BIGOT type there is a faint 

 trace of a médian stripe and in one of the others there are a few yellowish hairs in middle 

 of segments on their posterior borders, hairs at sides black; underside redder yellow, shining 

 with finer black pubescence and some yellow hairs on the segmentations. Legs reddish yellow, 

 coxae black with grey tomentum and white hairs, fore tibiae on their apical third, and ail tarsi 

 except the first joint of the middle and posterior pairs, blackish, pubescence chiefly black, 

 but partly yellow on the femora and lower border of tibiae. Wings clear greyish with a 

 yellowish tinge on the fore border, stigma yellowish brown, marginal cell at base white, 

 veins brown. 



20. Tabanns novae-guineensis n. sp. 



Type çf from Lorentz River. Type (female) with others from Bivak Island. 



A species nearly related to Tabanns serns Wlk., but distinguished by the broader 

 larger frontal callus reaching the eyes, brown in colour, and by the beard being brown not 

 whitish as is usually in the case of Tabanns seras. The fore femora are blackish, only the 

 tibiae being reddish yellow. Eyes in maie hâve the large facets occupying two thirds of the 

 surface reaching the frontal triangle, the small ones continued as a narrow border to the vertex. 

 Palpi club shaped, yellow with black hairs. Length, maie, 15 m. m., females 16 — 19 m. m. 



21. Tabanns extricans Walker. 



Proc. Linn. Soc. London, V, p. 275 (1861). 



Type is a maie from Batchian Island, very possibly it may prove to be the maie of 

 Tabanus serus Wlk„ but the third joint of antennae appears to be dusky in colour. 



