1893.] MK. E. E. AUSTEK ON KEW DIPTEROUS Ds'SECTS. 143 



on each side below ; yellowish poUinose above in S , and with a 

 triangular patch of yellow pollen on each side in the middle in the 

 2 , scarcely separated by an indistinct black median line. Antennce 

 orange-yellow; third joint oval. Front and face in both sexes 

 clothed with very short pale yellow pile. Occiput yellowish 

 pollinose, with a fringe of silvery yellow hair. Thorax metallic 

 black, clothed on dorsum with very short appressed golden pile. 

 Humeri, an elongated spot from thence to the suture, a vertical 

 stripe and rounded spot below the sutural end of this, and two 

 oblique elongated spots below the base of the wing, and separated 

 by a fine line, yellow. Post-alar callosities reddish brown, some- 

 times darker. ScuteUum AvhoUy yellow, but sometimes semi-trans- 

 lucent behind, or more or less distinctly brownish on the disc. 

 Abdomen cylindrical at the base, expanding rapidly and spatulate 

 (especially in the $ ) from the base of the third segment ; general 

 colour reddish yellow, polished, with very short pile ; third and 

 fourth segments ivith consjjicuous hlaclc hind margins ; first segment 

 reddish yellow, with erect pale yellow pile on each side ; second 

 segment cylindrical, reddish brown, darker at the distal end, with 

 a )^ellowish band occupying the second fifth of its length from the 

 hind margin ; third segment yello\Wsh at the immediate base, with 

 a reddish-brown triangular patch on each side (especially distinct 

 in the $ ) narrowly reaching the hind margin, then yellow, except 

 the hind margin, which has a sharply defined black band ; the 

 yellow area of the segment is consequently triangular, with its 

 apex directed forwards ; fourth segment yellow^, the basal angles, 

 sides, and a large somewhat triangular area on the hind margin 

 with its apex directed forwards, black (the sides of this and the 

 previous segment in the d are usually curled round ventrally, and 

 to be seen must be looked at from beneath) ; fifth segment yellow, 

 with a blackish median basal spot, indistinct in the c? : S genitalia 

 reddish yellow, projecting. Legs yellow ; coxfe blackish at the base ; 

 an ill-defined band on the distal half of the posterior femora, not 

 reaching to the tip ; distal half of the posterior tibiae, and base of 

 first joint of the posterior tarsi, brown. Wings suffused with 

 brownish ; costal border to the termination of the third vein brown, 

 darkest in the outer portion of the subcostal cell and at the tip : 

 alula of about half the normal size. 



Ceylon, neighbourhood of Trincomali (Lient.-Colonel Terhury) ; 

 Mulmein (type) ; Sarawak {Wallace). Colonel Terbury obtained 

 five specimens, three of which he has presented to the Museum. 

 He states that the species is rare. The tS which I have described 

 was taken at Kanthalai, March 8, 1892 ; the $ at Kottawa, April 

 24, 1892 : the third specimen presented is a J , also from 

 Kanthalai, Jan. 31, 1891 ; the other two individuals obtained 

 are a d" and $ , the former from Bentota, June 6, 1890, and the 

 latter from Huldamulla, June 10, 1892. 



Baccha gratiosa. Big., from Sarawak, and B. vespceformis, Dol. 

 (Natuurk. Tijdschr. Ned. Ind. xiv. p. 411, pi. iii. fig. 1), from 

 Amboina, are allied to this species. The latter resembles it very 



