— 3/i8 — 



the scapal segmeuls orange; flagellar seg'uenls very iiidislinclly bicolo- 

 lous, tho large, globiilar, basai eulargemeul of each segment black, the 

 lemainder ofeacli segment flark brown; llagellar segments ralher deeply 

 incised benealh. Anterior part of vertex pale; remainder oC vertex grey 

 witli an indistinct médian brown line. 



Mesonolum liglit bliie-grey, the priescutum Avith tour darker brownish 

 grey stripes, ihe inlermediate pair separated by a capillary pale line, 

 thèse lalter stripes sometimes obsolescent near suture; scutellum light 

 grey with an indistinct médian brown line; poslnotnm light grey with an 

 oblique brown line extending from the lateral-anterior angle caudad and 

 sligiitly proximad. Pleura light gie\ , ihe mesepisternum more blue- 

 grey. Mesoslernum blue-grey. Haltères pale brownish yellow, the 

 knobs dark brown with pale apices. Legs with the coxae pale grey prui- 

 nose; trochanter s yellow; feniora brownish yellow, gradually darkening 

 to tip, tibiœ light brown, the tips darkened; tarsi dark brown. Wings 

 whitish subhyaliue, cells C and Se yellow; stigma brownish yellow; a 

 brown clond at origin of lis and along the cord; wing-membrane clonded 

 with pale brown, this including the wing-apex in cells i?2 and R^; most 

 of cells Ml to Mu and îtnd A , and the centers of cells Cwi, Cu and isl A; 

 cells R and ifs almost uniformly subh\aline; cell ilf with a large brown 

 cloud at distal end and another fainter clond near midlength; veins dark 

 brown. Venation : fia + s longer ihan distal section of R^; pétiole of cell 

 M\ variable in length, from longer to shorter than m; m-cu puncti- 

 forra, at midlength of cell Jst M% 



Abdominal tergites yellowish, narrowly trilineate with dark brown, the 

 sublateral brown stripes broader than the narrow latéral margins, slightly 

 prninose; médian stripe very narrowly interrupted at the poslerior mar- 

 gins of the segments; steruites obscure yellow Avith a broad but ill-defined 

 médian brown stripe. Maie hypopygium with the ninth tergile flaltened, 

 the caudal raargin with a very broad U-shaped nolch, the latéral lobes 

 thus formed obtusely rounded; dorsal surface of tergite with two low and 

 indistinct carina?, converging posteriorly. Ninth plenrite large, elongate, 

 jiitting caudal of the tergite; viewed from the side, narrowed apicallv, ihe 

 apex on the proximal face with a small blackened toolli; nuler plein-al 

 appendage broad, narrowed al base, widened distall) , the outer surface 

 with abundant setae; inner pleural appendage simple in structure, the 

 cephalic face blackened and with a deep notcli before the apex, cutting off 

 a short apical lobule that juts into the nolch of the ninth tergite. Ninth 

 sternitc narrow, with a U-shaped médian notch. Eighth sternite unarined. 

 Penis-guard, vieued from beneath, elongate-lringular, broad-based, nar- 

 rowed to the acnle lip. 



llahiUU. — iVlongolia, 



