32 Miss G. Ricardo on the 



tomentum and appressed fulvous hairs ; shoulders honey- 

 yellow, with loii£ brownish hairs ; breast with grey tomentum 

 and long whitish hairs. Scutellum same as thorax. Abdo- 

 men amber-brown, paler at the base and darker towards the 

 apex, often with indistinct brownish-red markings ; pubes- 

 cence on dorsum and at sides not noticeable, being very 

 short and black on the dorsum and at the sides, only longer 

 towards the apex ; underside as described by Macquart. 

 Legs uniformly yellowish, with black pubescence. Wings 

 clear yellow at base and on fore border ; in most of the 

 specimens the first posterior cell is a little narrowed at 

 border. 



Length from 12 mm. ; length of proboscis 2 mm. 



$ . Face not raised so much beneath the antennae, hairs 

 rather longer and thick; palpi conical, with short black 

 pubescence. Eyes with large facets taking up two-thirds of 

 the surface, starting from the base of subcallus and reaching 

 the vertex. Wings yellowish on the fore border and at base. 



Diatomineura plana, Walker, List Dipt. i. p. 144 (1848) ; 

 Ann. & Mag. Nat. Hist. (7) v. pp. 113, 118 (1900). 



Diatomineura nigricornis, Bigot, Mem. Soc. Zool. de France, v. p. 614 

 (1892). 



Type (female) from Australia in Brit. Mus. Coll. 



Bigot's type, from Australia, in poor preservation. 



A medium-sized blackish species, with ashy-grey tomentum 

 on face and forehead. Antennae and palpi reddish yellow. 

 Abdomen with all segmentations yellow- or white-haired. 



Length 12 mm. 



Face very protuberant, tomentum on lower part yellowish 

 o-rey ; dark hairs on central protuberant face, cheeks almost 

 bare. Beard yellowish wdiite, thick. Palpi reddish yellow, 

 the second joint broad at hase, tapering to a long point. 

 Antenna with the first two joints blackish, covered with grey 

 tomentum, and with black hairs. Forehead parallel, with 

 fairly thick black pubescence ; no callus visible. Eyes with 

 pubescence thickest on the lower half, reddish, with some 

 white hairs. Thorax blackish, covered with appressed fulvous 

 hairs and longer black ones towards the sides, longer white 

 hairs on anterior part of dorsum ; two indistinct stripes are 

 visible, with grey tomentum ; shoulders reddish, with dark 

 hairs, sides with tuft- like yellowish-white hairs continued to 

 base of scutellum, which has also a fringe of shorter hairs 

 on its posterior border. Abdomen blackish brown, the pale- 

 coloured hairs on segmentations nearly a third of the width 



