1893.] ME. E. B. ATTSTEIT Olf IfEW DIPTEUOTJS INSECTS. 151 



Group III. 



Baccha cttltrata, sp. n. (Plate Y. figs. 8, 9, d" 2 •) 



$ . Length 12| mm. : width of second abdonunal segment 

 2h mm., of fourth'abdomiual segment ?■, mm., across the posterior 

 margin in each case. 



Head and thorax ydlow, central porttoa of dorsum of tliorax darV 

 greenish bronze, w'dh three cinereous 'poUinose stri^'cs ; abdomen very 

 broad and fat, not contracted basaJhj, but expanding regularly to 

 beyond the middle of the fourth segment, chestnut coloured, with 

 ochraceous hands and other marhings, a posterior band on the second 

 to the fourth segments shining biirnt-sienna coloured ; first and second 

 pairs of legs wholly ochraceous; posterior pair ochraceous rufous, with 

 an incomplete and ill-defined brownish band near the tips of the 

 femora, the tibice, except the base and tips, durlc brown, and the tarsi 

 luhitish yelloiv. Wings large, broad, strongly suffused with ochraceous, 

 darl-est along the fore-border above and immediately below the second 

 long itudinai vein, and in the distal third of the submarginal cell; 

 there is also a less darh area on each side of the sixth longitudinal 

 vein ; second longitudinal vein considerably convex fonvards in the 

 central portion of its course ; third longitudinal vein nearly straight, 

 termincd portion of fourth vein closing first posterior cell deeply 

 sinuate, but not very oblique: alulce about half the full size, ivitli a 

 straight posterior edge : Iniobs of halter es ferruginous. 



Face and cheehs shining opalescent yellow ; facial tubercle low, 

 ochreons. Front orange-ochraceous, dull, the posterior fovirth dark 

 olivaceous ; antenniferous tubercle shining yellow on the sides, 

 with a large qnadrate shining black spot above the base of the 

 anteunffi ; from the ocelli, which are remote from the vertex, a 

 narrow dark median stripe runs forw ards, but becomes faint and 

 nearly obliterated before reaching the supra-autennal spot. An- 

 tennce missing : occii)ut yellowish poUinose, with a fringe of pale 

 yellow hairs. Of Ibe three cinereous pollinose stripes on the 

 thorax, one, which is ^ery narrow, is in the median line, and is 

 separated by t\\o narrow dark stripes from the other two cinereous 

 stripes, which are broader ; outside these is a very broad dark 

 bronze stripe on each side, which is divided by the transverse 

 suture ; the cinereous stripes are abbreviated at about two-thirds 

 the length of the thorax, leaving the bronze colour toextend to the 

 scutellum ; sides of the dorsum and pleurae metallic yellow, the 

 posterior portion of the pleurss more steely ; metanotum shining 

 bronze. Scutellum raw-sienna coloured, yelloAver along the anterior 

 margin, moderately shiuing. Abdomen : first segment yellow on 

 the sides, orange-ochraceous in the centre, with the central portion 

 of the posterior border dark bro^^n; second segment reddish 

 ochraceous at the base, and with a narrow and considerably curved 

 (posteriorly concave) ochraceous baud across the middle ; this may 

 appear to be narrowly interrupted in the median line ; third seg- 

 ment narrowly ochreous at the extreme base, and with a broad, 

 slightly curved (posteriorly concave) ochraceous transverse band, 



