138 Orlhorrhapha brachycera. 



black hairs; the posterior ventral lobes are slightly projecting, with 

 the apex turned upvvards; inner lamellæ short, curved downwards, 

 the median very thin, the lateral dilated, with a dilatation at the 

 apex; the outer lamellæ are ovate or roundish reetangular, whitish 

 with a blackish margin along the ventral, apical and just the outer 

 part of the dorsal edge, it is somewhat broad at the end; the end 

 has teeth with black, curved hairs, and dorsally to them a pair of 

 curved hairs; the ventral margin is serrated and has long and fine, 

 curved hairs, and on the inside more inwards curved hairs. Legs 

 yellow, front coxæ whitish pruinose anteriorly; posterior coxæ grey 

 with the apex yellow; anterior tarsi with the apex of metatarsus and 

 the four folio wing joints black; hind tibiæ black or blackish at the 

 apex, and hind tarsi black, but with the base of ^metatarsus yellow. 

 The legs have short, black hairs, front coxæ white-haired anteriorly 

 towards the outer side; hind femora with a little longer hairs above 

 towards the base, and short pale-haired below; posterior femora with 

 one preapical bristle; front tibiæ with bristles above, and one or two 

 on the postero-ventral side; middle tibiæ with about four antero- 

 dorsal bristles (one of them more dorsal), two postero-dorsal, and 

 one ventral bristle below the middle; hind tibiæ with two dorsal rows 

 of bristles, one ventral bristle towards the apex, and a ventral row 

 of very small, distantly placed bristles; hind metatarsi with two or 

 three dorsal bristles, generally a small anterior, and with very small 

 ventral bristles. Wings with a blackish or brownish blotch on about 

 the apical half at the anterior margin, stretching towards the discai 

 vein; veins black, costa with a short, but rather thick sw^elling; discai 

 vein with a small, obtuse bend; axillary lobe somewhat large and 

 anal vein going somewhat downwards. Squamulæ yellow, with a 

 black fringe. Halteres yellow. 



Female. Epistoma broad. Antennæ of about the same length as 

 in the male. The characteristic grey spot on the second abdominal 

 segment wanting. Front coxæ less white-haired than in the male. 

 Wings slightly tinged, but without any blotch, and without costal 

 swelling. 



Length 3,4 — 3,7 mm. 



This species is in the male easily recognised by the colour of the 

 wings; in the female it may be distinguished by the colour of the 

 antennæ, ^this being only the same in longicornis, which has much 

 longer antennæ, yellow hind coxæ, and hind metatarsus quite black; 

 pliimipes and Wahlbergi differ by having the basal antennal joints 

 quite yellow. — Stæger says, that the female has the hind metatarsus 

 alraost quite black, and Zetterstedt terms it quite black; all my 



