192 [August, 1906. 



J $. Thorax, aljdomen, and lialteres black ; thorax uiodei'alelj 

 shining; frons shining and very short (1 to 3), frontal bristles strong, 

 botli lower rows straight <? , slightly convex in front ? ; 3rd untennal 

 joint full large (^ , small ?, arista finely pubescent; paljii large 

 and broad with short and weak marginal bristles S , normal $ ; wings 

 tinged with yellowish-brown, cosla to middle of wing or a trifle 

 beyond, its outer half thickened, fringe extremely short, 1st thin vein 

 strongly curved at its origin, 4th vein ending in the margin, fairly dis- 

 tinct 9 , but scarcely traceable J ; 2nd abdominal segment ^ half the 

 length of the Ist at the sides, fitli segment lengthened, hypopygium 

 rather large and glossy, anal protuberance short and black, lamellae 

 shorter and broader than in nigricornis ( = opaca) ; legs black, tibiae 

 yellowish, fore tarsi longer than the tibiae by their two terminal joints, 



spine on hind tibiae always present. 



2^ — 2 J mm. — lugubris, Mg. 



14 (13) First abdominal segment $ shorter than 'Ind (normal), its hind margin 



emarginate only in female. Female proboscis large, projecting beyond 



palpi. 



S 9 . Very like preceding species. Chief differences are as 



follows : — Frons more highly glossy and shorter (1 to 2), frontal 



bristles rather weak and the rows straight in both sexes ; 3i*d antennal 



joint very large J , arista' bare ; palpi narrower ; wings not quite of 



so deep a colour, 1st thin vein makes not so bold a curve, and the 4th 



is more indistinct and ends abruptly half way to the margin ; 2nd 



and 6th segments S lengthened, hypopygium very large, and furnished 



with a pair of narrow shining black and forceps-like processes besides 



the ordinary lamellae ; legs blackish-brown, forelegs and all the knees 



yellowish, spine on hind tibiae rarely present, foi'e tarsi longer than the 



tibiae by the terminal joint only, 



2f mm. — opaca, Mg., =^ nigricornis, Egg. 



15 (12) Scutellum loith two bristles and two coarse hairs. Fore tarsi of the usual 



slender form. 



<J ? . Thorax dull ; frons dull and moderately short (1 to 2) ; 



the rows of bristles straight in both sexes ; 3rd joint of antennae 



small, arista bare ; palpi of the usual size and shape, but marginal 



bristles S stubby ; wings almost clear, costa very long, reaching well 



beyond the middle, slender and not thickened on the outer half, fringe 



longer than in lugubris, and 4th thin vein very fine, ending abruptly 



three-quarters of the way to the hind margin ; 1st abdominal segment 



of the usual shape, 2nd and 6th segments J moderately lengthened, 



hypopygium dull, anal protuberance yellow, longer and more slender 



than in lugubris, and the lamellae narrower. In all other respects like 



lugubris. Taken in the autumn. 



2 — 2\ mm. — sublugubris, n. sp. 



16 (2) Four thin veins, the axillary one always distinct. 



17 (38) Middle tibix toith three spines, tvithout reckoning the apical spur or spurs, 



namely, a pair at or near the end of the upper third, and one, some' 



