1593.] ME. E. E. ATJSTEN ON N^EW DIPTEROUS INSECTS. 139 



bluntly oval ; arista brown, except the base. Thorax metallic black, 

 finely punctate, with very short, silky, yellowish pile ; humeri, a 

 stripe from them to the suture, a vertical stripe on the pleurae in 

 front of the suture, a large rounded spot below this stripe, an 

 oblique elongated spot behind the base of the \™igs, and the 

 anterior margin of the scutellum pale yellow. Scutellum, except 

 anterior margin, blackish brown, punctate. Abdomen cylindrical 

 and very narrow from posterior half of first segment to middle of 

 third, expanding and spatulate from thence to the tip ; general 

 colour reddish brown, clothed with short, appressed, blackish pile ; 

 second segment with tine, whitish, erect pile on the sides ; a very 

 conspicuous translucent yellow sj)ot, occupying distal third (rather 

 more in $ ) of the third segment, and shaped lilce an equilateral 

 triangle ; first segment yellow, brown at the tip ; second segment 

 reddish bro^^"n, darker at the tip, before which is a narrow indistinct 

 lighter band ; base of third segment yellowish, posterior margin 

 browii ; fourth segment polished dark brown, steely on postei'ior 

 margin in (S ; fifth segment polished dark brown, with a steely 

 sheen ; external genitals reddish in both sexes, rather prominent 

 in S • Legs luteous, coxre blackish bro\^"n ; posterior femora reddish 

 brown, yellowish at the base ; posterior tibiae pale yellow on basal 

 third, then dark brown ; first joint of posterior tarsi dark brown, 

 except at the tip ; this and the remaining joints dull yellow. 

 Wings hyaline, \\'\t\\ a brownish tinge along the posterior margin ; 

 subcostal cell dark brown, and a brownish patch at the distal extre- 

 mity of the marginal and submargiual cells, terminating sharply 

 at the third vein ; the latter straight ; veins dark brown : alidoi 

 almost absent. 



In the shape of the profile of the face and in the venation of 

 the wing, this species resembles B. pedicellata, Dol. (according lo 

 Doleschall's figui'e), from Java; but the sharply-defined yellow 

 triangle on the third abdominal segment distinguishes the species 

 from any other known to me. 



lluldamulla, Ceylon ; circa 4000 ft. (Lieut.-Colonel Yerhury). 

 A pair taken in co^ndd, June 10, 1802. 



BACcni PULCHEimoNS, sp. n. (Plate IV. figs. 10, 10", 11, d § .) 



d 2 ■ Length : J 10 to 11^ mm., 5 9f to 10^ mm. 



In (S , front, upper part of the face immediately below the an- 

 tennae, and a hroad facial stripe reaching to the oral margin steely. 

 In 2 ,/Vo/(^, including whole circumference of antenniferous pro- 

 jection and a facial stripe, narrower than in the (S , but reaching 

 to the oral margin, metallic black, sometimes steely ; sides of face 

 yellowish pollinose ; cheeks orange-yellow, with a blackish-brown 

 spot in front, more or less distinctly coiniected with the facial 

 stripe, sometimes indistinct in the 5 . Front (including vertical 

 triangle in the J ) and face clothed with pale yellow ])ile. Frontal 

 triangle in J dusted with yellowish ])ollen above ; front in ? , a 

 little below the iniddle, with a triangular patch of pale yellow jjolleu 

 on each side, the apices of the triangles meeting or narrowly 



