1893.] ME. E. E. ATJSTEK Olf NEW DIPTEROUS INSECTS. 137 



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

 the first posterior cell ; in the d 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 Yerhunj'). The typical specimens are 

 from'Kandy {circa 1800 ft.), the S collected June 28, 1892, the 

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

 men from Baddegama, in the neighbourhood of Guile. 



This species is distinguished from any other known to me from 

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

 sharply-defined facial and antenniferous tubercles when viewed in 

 profile. 



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



<S . Length 13 mm. 



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

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

 middle of the face. Antenna yellow. Front brownish, yellowish 

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

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

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

 vertical stripe on the pleurae below the transverse suture yellowish 

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

 below the base of the wings. Scutellum 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 yellow for rather more than half its length, then metallic 

 brownish black, with a somewhat V-shaped transverse brown 

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

 apex of the V being directed forwards and the arms widely 

 divergent ; 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 with sparse and very 

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

 practically bare. T^\\ejirst two pairs of legs yellow ; the 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 portion is darker brown than the 

 remainder, and the posterior tibiae have the tips and an ill-defined 

 band in the middle yellowish. Winr/s brown, paler at the tips, 

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

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

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

 longitudinal vein bends downwards before joining the costa, so 

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

 tudinal vein bends slightly upwards at its termination, and the 

 terminal portion of the fourth longitudinal vein is very oblique, 



