1913-] E. Brunetti : Diptera. 165 



Bacha flavopunctata, mihi, sp. nov. 



(PL vi, figs. 5-6). 

 9 Assam. lyong. 9 mm. * 



Head. — Vertex, and the frons for a short distance, shining 

 black ; remainder of frons, down to the antennal protuberance, 

 yellow-dusted. From this part downwards, the whole face pale 

 yellow, with a median shining black stripe and a black spot imme- 

 diateh" above the antennae, which latter are wholly bright ^'■ellow. 

 Below the mouth opening, shining steel colour ; proboscis yellow, 

 occiput dark grey with a fringe of short yellow hairs. 



Thorax. — Dorsum shining dark aenous black, an oblong bright 

 callus-like yellow spot on the shoulders ; an elongate perpendicu- 

 lar stripe on the mesopleura, with a small spot below it on the 

 sternopleura : a diagonal stripe on the metapleura from the just 

 mentioned spot, passing behind the wing root ; all these spots 

 bright yellow, callus- like, smooth and shining. Scutellum bright 

 yellow, with a central brown oval spot; a few grey hairs. 



Abdomen. — Very attenuated on basal half except at base of 

 1st segment ; some white lateral hairs towards the base, the rest 

 of the surface with sparse short black hairs. The ist segment pale 

 yellow, 2nd light brown, very narrow to tip, 3rd and 4th gradu- 

 ally widening to the tip of the latter, each with a wide black band 

 on posterior margin ; 3rd blackish also at base, especially towards 

 the sides ; 5th segment brownish yellow. Belly similar to dorsum. 



Legs. — Coxae black ; anterior legs (except coxae) wholly 

 bright yellow down to tarsi tips ; a broad median band on hind 

 femora, and the apical half of hind tibiae, dark brown or black; 

 upper side of hind metatarsus rich dark golden brown, the colour 

 more or less extending to the under side, which is covered with 

 golden brown hair ; remainder of hind tarsi orange-yellow. 



Wings. — Clear grey; subcostal cell blackish, costal cell and 

 about the basal half of the marginal cell brownish, and the costa 

 from the end of the stigma to the tip of the 3rd vein, narrowly 

 and distinctly black suffused. Halteres 3^ellow. 



Described from a single 5 from Dibrugarh, 17-19-xi-ii. 



N.B. — This species must be near gratiosa, Big. Several 

 specimens were already in the Indian Museum from Sukna (base 

 of Darjiling hills) and one from Rungpo, Sikkim, 6-ix-09, all 

 males. 



Sphegina tristriata, mihi, sp. nov. 



(PI. vi, fig. 7). 



9 N.E. Frontier of India. Long. 6 mm. 



Head. — Frons uniformly wide, about one-fourth of the head^ 

 shining black, but not briUiant. Eyes dull red, antennae brown- 

 ish yellow, 1st joint brownish, 3rd a little infuscated above at the 

 tip. Mouth parts and proboscis yellowish. 



Thorax. — Ground colour brownish yellow, but dorsum almost 

 wholly occupied by three practically contiguous dark brown 



