250 LEPTID^ 



even the long narrow marginal cell usually brownish ; veins after the base 

 conspicuously thick and black, except that the mediastinal vein is pale brown 

 and the discal vein and all its branches are thinner than the other veins ; 

 there is a tendency to clouding about the base of the cubital fork and on the 

 end veins of the discal cell, and there is a slight cloud crossing the triangular 

 end of the upjjer basal cell, the base of the discal cell (sometimes rather 

 conspicuously), and down both branches of the postical fork, while all 

 the stem of the postical vein is margined dark brown, making it appear 

 unusually thick • the pnefurca has a pale piece just before the origin of the 

 cubital as though a pellucid band crossed the wing thereabouts ; stem of the 

 cubital vein slightly longer than the lower branch of its fork, the upper 

 branch more or less S-shaped and a little more than half as long as the lower 

 branch and ending in the wingmargin about half-way between the ends of the 

 lower branch and the radial vein ; lower branch of the cubital fork ending 

 immediately before the wing-tip ; ambient vein continued all round the wing, 

 though very thin on the hindmargin and not extending across the alula ; the 

 lower of the two veinlets forming the base of the cliscal cell slightly the 

 longer; small cross-vein sometimes just existing, but often the upper branch 

 of the postical vein just touches the discal cell at a sharp angle ; the fourth 

 posterior cell may be very slightly narrowed towai'ds the wingmargin ; anal 

 cell usually closed at the wingmargin, but occasionally just open ; alula 

 absent, so that there is a long almost straight clear hyaline basal hindmargin 

 of the wing uji to the angle of the fold which extends up to the faint axillary 

 vein. Wing-membrane all minutely pubescent but not in the least rippled. 

 Alar squamae small but distinct, pale yellow with a slight pale yellow fringe ; 

 thoracal squamte absent, being only indicated by an unfringed pale yellow 

 frenum. Halteres conspicuously long and large, whitish yellow to dull 

 orange. 



? . Larger than the male, with the wing-markings much more conspicuous, 

 and with a conspicuous long-pointed telescopic ovipositor. Frons at the 

 vertex fully a quarter the width of the head, and the frons and face of almost 

 eqnal width right down to the mouth or if anything slightly narrower at 

 the mouth than at the vertex ; frons shining black with a broad transverse 

 band of greyish yellow pollen just below the ocelli or even including them 

 and the absolute margins of the sockets of the antennee light grey ; upper 

 part of the face also covered Avith light grey dust all across, but the lower part 

 shining black ; the narrow sides of the mouth are shining black ; back of the 

 head inflated on nearly the lower half (about one-third the width of the 

 eye when seen in profile), but on the upper part almost flush with the eyes ; 

 lialpi blackish almost to the base but obscurely oi'ange there. Eye-facets 

 rather large, but all equal in size. Antennae, proboscis, etc., almost as in 

 the male. 



Thorax mainly dullish grey with two shining broad black stripes which 

 are well separated but which widen out laterally in front so as to connect 

 there with the broader shining black lateral stripes, but in some lights they only 

 extend backwards on the disc just over the suture unless indistinctly and not 

 shining, but in other lights they are still shining and even coalescing just after 

 the suture ; most of the thorax behind the suture is dull blackish grey, but 

 the shining lateral stripes are continued right through and bend round the 

 hindmargin so that only a comparatively narrow middle dull grey line 

 extends towards the scutellum ; humeri sometimes, and the postalar calli 

 and their neighborhood, rather brownish. Scutelkim shining black but 

 brownish at the sides and on the ridge running from the postalar calli. 

 Pubescence on the thorax and scutellum practically none, but some minute 

 sparse light grey pubescence exists on the two shining dorsal stripes, especially 

 after the suture. 



Abdomen long, ending in a long-pointed telescopic ovipositor, glittering 

 black or brownish black ; first six segments almost equal in length, and 

 the second to fourth as broad as the thorax, while the first and fifth are 

 slightly narrower, and the sixth distinctly narrower ; the seventh segment 

 forms a narrow cone and emits the very long narrow yellowish brown 

 ovipositor, which is distinctly longer than the seventh segment and which 



