178 DOLICHOPID.E. 



long and rather narrow, light brownish; the subapical and cubital 

 veins nearly parallel ; the costal vein in male with a black swelling near 

 the base, not reaching to the junction of the subcostal. Lamella dingy 

 yellowish', arms of forceps slender, the tip incurved and spatulate. Legs 

 yellow ; coxae dusky ; tarsi dusky, metatarsi ydlow with dusky tip ; hind 

 metatarsus not much shorter than the next joint ; the fore tibiae, be- 

 sides the two or three small spines in the upper half, are very minutely 

 pectinated, in front, along the outer edge, in the last two-thirds of 

 their length. 



Not rare. (E. S. T.) 



49. aerosus, Fin. dol. 15. 17 (1823); Mg. ; Mq. ; Stn. ; Hal.; 

 Stg. ; Ztt. Obscure viridis, pedibus favis, femoribus posticis supra et 

 tarsorum articulis exterioribus fuscis, alts subhyalinis, venis ciibitali et 

 subapicali parallelis ; Mas. lamellis et hypostomate nigris ; Fcem. hypo- 

 stomate cano. Long, 1; alar. 3 lin. 



Dark metallic-green. Front yellowish-grey. Face in male narrow, 

 black, greyish at the mouth ; in female dull grey. Arista very finely 

 pubescent ; penultimate joint more than half the length of the last, in 

 male. Wings rather long, dark hyaline, the subapical and cubital veins 

 nearly parallel. Lamella dusky '-black ; arms of forceps very slender, 

 subulate, with the tip incurved. Legs yellow ; coxa3 dusky, fore pair 

 paler at the tip ; tarsi dusky, fore pair paler, metatarsi yellow ; the hind 

 femora, sometimes also the fore pair, broionish on the upper edge ; the 

 fore tibia more faintly pectinated than in the preceding. 



Common in shady places. (E. S. I.) 



In the rest, the lamellse are attenuated ; the inner appendages 

 lengthened, sometimes fringed at the tip with long pale hairs ; 

 the arista is nearly naked, the penultimate joint long in the 

 males at least; the subapical vein nearly straight, converging 

 slightly to the cubital ; the hind metatarsus not much more than 

 half the length of the following joint ; the disc of the scutellum 

 is naked in general, but D. nanus prepares the transition to those 

 last preceding. It might, perhaps, be better to place them with 

 Sybistroma, as Stseger has done. I have followed Zetterstedt in 

 limiting that group to the species with the hypopygium of the 

 male light-coloured, and the cilia of the lower orbit whitish. 



50. nanus, Mq. emp. 66. 15 (1827). minimus, Ztt. Obscure 

 viridi-ceneus, hypostomale albido, pedibus Jlavis, femoribus tibiisque pos- 

 ticis apice, tarsisque fuscis, metatarsis anterioribus Jlavis ; Mas. lamellis 

 oblonyisflamdis. Long. \\ lin. 



Dark brassy-green. Front a little hoary. Face silvery-white and 

 very narrow in male, yellowish-white in female. Scutellum very faintly 

 pubescent on the disc. Wings dark hyaline. Lamella dingy yellow y 

 oblong. Legs yellow ; posterior coxae dark grey ; a spot at the tip of 



