Empididae. 153 



5. H. quadrifaria Strobl, 

 1892. Strobl, Verh. zool. bot. Gesell. Wien, XLII, 116, 9. — 1903. 

 Kat palåarkt. Dipt. II, 255. 



Male. Vertex and frons velvet black; epistoma black; palpi 



blackish, with long, black hairs. Occiput velvet black, with black^ 



downwards brownish hairs. Antennæ black. Thorax slightly shining, 



dirty blackish brown, generally with two narrow, very faint, lighter 



stripes. The dorsocentral and acrostichal bristles somewhat long, 



black; the former uniserial, longer behind, the latter distinctly quadri- 



serial, those in the inner rows slightly longer than the outer. Further 



a humeral bristle, a posthumeral, about three notopleural, a supraalar 



and a postalar bristle, all black. Pleura grey pruinose. Scutellum 



with four black marginal bristles. Abdomen black, somewhat greyish 



pruinose and slightly shining, almost duU; it has short, black hairs, 



and longer, bristly hairs at the hind margin of the segments. Venter 



quite grey, dull, short-haired. Exterior genitalia somewhat 



large, compressed, the lamellæ incised at the end and thus 



divided into a broader, outer, and a narrower, inner process. 



Legs black; coxæ greyish pruinose. The front femora have 



long hairs on the postero-dorsal side, the middle femora 



about five long bristles on the anterior side, and the hind 



femora long hairs above and still longer and more bristly 



hairs belovv; the front tibiæ have some bristly hairs above, 



the middle tibiæ on the various sides, and the hind tibiæ 



are ciliated above and below, and have bristles on the 



dorsal and anterior side. Front metatarsi thick, cylindrical, 



not twice as thick as the end of tibiæ and about three Fig. 52. H. 



„ , quadrifaria^ 

 fourths of it in length and almost as long as the tour lol- front leg. 



lowing joints; they are somewhat short-haired, the hairs x 30. 



below rather strong. The hairs and bristles black or brownish black. 



Wings hyaline or slightly greyish. Veins black; the upper branch of 



the cubital vein nearly rectangular at its origin, the curve somewhat 



angular, and the branch slightly diverging. Stigma distinct, blackish 



brown. Halteres black. 



Female. Quite similar to the male; the thoracic bristles some- 

 what shorter. The hind tibiæ thickened towards the end and curved 

 somewhat inwards. Front metatarsi simple, about half as long as 

 tibiæ and as long as the three following joints. 



Length 2,8 — 3,5 mm. 



H. quadrifaria is common in Denmark ; it is however not known 

 from earlier time, and was not present in Stæger's coUection; it was 

 for the first time taken in 1881. Utterslev Mose, Amager, Præste- 



