Wagneria. 543 



Tahle of Species. 



1. Abdomen without discai bristles (or these quite small); two 

 scutellar marginal bristles on each side 1. nigrans. 



— Abdomen with well developed discai bristles; three scutellar 

 marginal bristles on each side 2. 



2. Species without pruinosity; wings dark on anterior outer part; 



apical cross-vein straight or nearly 2. costata. 



— Abdomen with white pruinose bands; wings not darkened; 



apical cross-vein strongly concave 3. lentis. 



1. W. nigrans Meig. 



1826. Meig. Syst. Beschr. V, 40, 11 (Dexia) et 1838. VII, 210, 5 {Rhino- 

 phora). — 1900. Stein, Ent. Nachricht. XXVI, 144. — 1924. Stein, Arch. f. 

 Naturgesch. 90, 6, 125, 7 (migrans). 



Male. Frons above considerably broader than the eye; jowls 

 two thirds of the height of the eye or more. Orbits, cheeks and jowls 

 bluish grey, the orbits darkest; frontal stripe velvet black. Three 

 orbital bristles, and inner and outer verticals. Frontal bristles reaching 

 only to insertion of antennæ, the uppermost reclinate and outwards 

 to it an outwards directed bristle; on cheeks a row of strong, down- 

 wards directed bristles, reaching near to lower end of the eye. Orbits 

 and cheeks with some few fine hairs; jowls bare. Occiput grey, with 

 sparse whitish hairs, and some black hairs behind postocular bristles. 

 Antennæ black or brownish black, second joint a little reddish at apex; 

 third about thrice as long as second, shorter or longer; arista thickened 

 in less than basal half. Palpi yellowish. Thorax æneous black, some- 

 what shining, a little greyish pruinose, the pruinosity leaving three 

 broad black stripes; scutellum æneous black. Thorax somewhat 

 sparingly with black hairs; two præ- and generally two postsutural 

 acrostichals ; no præsutural intraalar bristle. Scutellam with only two 

 marginal bristles on each side, the basal wanting, and with a pair of 

 discai bristles near base. Two sternopleural bristles. Abdomen æneous 

 black, shining, black-haired, with only marginal bristles, on second 

 segment none, on third a pair and on fourth also only a pair besides 

 the lateral; on third and fourth segment sometimes a pair of small 

 discals. Legs black. Wings with anterior half blackish or blackish 

 brown, bordered by the postical vein and the apical and posterior 

 cross-veins; veins blackish; first posterior cell somewhat long petiolate; 

 discai angle rectangular with a minute veinlet; apical cross-vein 

 concave; cubital vein with bristles to or somewhat beyond medial 

 cross-vein; costal spine large. Squamulæ whitish. Halteres brownish. 



