1893.] MR. E. E. AtTSTEK OlS" NEW DIPTEROUS INSECTS. 137 



inner side nearly hyaline ; third vein gently curved ahove the base of 

 the first posterior cell ; in the c? the wings are narrower and less 

 rounded at the tips, while the terminal section of the fourth 

 posterior vein, closing the first posterior cell, is less sinuate and 

 more oblique than in the § : alulce long, narrow, posterior margin 

 straight. 



Ceylon (Lieut. -Colonel TerJmry). The typical specimens are 

 fi'om Kandy {circa 1800 ft.), the J collected June 28, 1892, the 

 $ May 25, 1892. Common in the Central Province ; one speci- 

 men from Baddegama, in the neighbourhood of Galle. 



This species is distiuguished from any other known to me from 

 the Oriental Region, by the marking of the abdomen, and the 

 sharply-defined facial and autenuiferous tubercles when viewed in 

 profile. 



Baccha bicolor, sp. n. (Plate IV. fig. 6, S .) 



S . Length 13 mm. 



Face and cheehs pale yellow, clothed with yellow pollen ; a 

 small, round, bare, sharply-defined tubercle slightly below the 

 middle of the face. Anteiuue yellow. Pront brownish, yellowish 

 poHinose on the sides, clothed with pale yellow pile. Vertical 

 triangle black. Thorax didl brown, faintly pollinose on the dor- 

 sum ; shoulders and pleurae in front pale yellow ; a conspicuous 

 A'ertieal stripe on the pleuriB below the transverse suture yellowish 

 white, pollinose ; a similar, but somewhat duller, spot behind and 

 below the base of the \\'ings. Scutellaui reddish brown. Abdomen ; 

 first segment yellow, blackish on the sides ; second segment yellow, 

 brownish in the middle, and brown on the distal fifth ; third seg- 

 ment yello\^• for rather more than half its length, then metallic 

 brownish black, ^ith a some\\hat V'^^i^^^pyt^ transvertfe broun 

 mark on the yellow portion near the base of the segment, the 

 apex of the V being directed forwards and the arms widely 

 divei'gent ; the remainder of the abdomen metallic prune-purple ; 

 external genitalia yellow, not projecting beyond the fifth segment. 

 The abdomen is spatulate from the commencement of the third 

 segment, and on the dark portion is clothed \^'ith sparse and very 

 short appressed black pile ; elsewhere the body of this species is 

 practically bare. TUeJirst two 2^((i''s of Icr/s yellow • tlie posterior 

 legs, except rather more than the basal half of the femora, which 

 is yellow, pale brown ; on the posterior femora a narrow band at 

 the commencement of the dark ]:)orlion is darker brown than the 

 remainder, and the posterioi- libiic have the tips and an ill-defined 

 band in tlie middle yellowish. ]Viiii/s brown, paler at the lips, 

 and with a small area at the base on the inner side nearly hyaline ; 

 tlie wings are rounded at the tip and show no angle at the 

 jnnction of the costal vein with the hind margin ; the second 

 longitudinal vein bends downwai'ds before joining the costa, so 

 that the end of the marginal cell is blunt, wtiile the third longi- 

 tudinal v'iMii bends slightly u|j\\ar(ls at its termination, and the 

 terminal portion of the fourth longitudinal vein is very oblique, 



