Dolichopodidae. 165 



Endelave in Horsens Fjord; finally on Bornholm. My dates are 

 12/7 — .6/g_ n occurs in low herbage on meadows and especially at the 

 horders of pools and ditches, not rarely at ditches with putrid water, 

 and it is generally present in great or very great numbers; it may 

 also occur on humid piaces in woods. 



Geographical distribution: — Northern and middle Europe down 

 into France; towards the north to middle Sweden. 



8. Hepcostomus Loew. 



(1857. Neue Beitr. V, 9). 



Medium sized or somewhat small species of metallic colour. This 

 genus is again in most respects agreeing with Dolichopus. Head as 

 broad as or slightly broader than thorax, short, somewhat semiglobu- 

 lar; it is about as broad as high or a little broader, broadest in the 

 female, and it is a little narrowed downwards. Occiput slightly arched. 

 Vertex a little excavated, the ocellar tubercle slightly prominent. Frons 

 broad, generally a little decreasing in breadth towards the antennæ in 

 the male, but with parallel or almost parallel margins in the female. 

 There are ocellar, outer vertical and postvertical bristles, and a couple of 

 small bristles on the posterior side of the ocellar tubercle. Eyes as in 

 Dolichopus^ metallic green with some reddish reflexes in the living speci- 

 mens; they are densely short-haired; the facets of about the same 

 size or very slightly enlarged towards the epistoma in the male. 

 The eyes are separated, more or less narrowly in the male, more 

 bi'oadly in the female. Postocular bristles forming a single row; no 

 bristles above the oral aperture on the back of the head. Antennæ 

 inserted near to each other, above the middle; they are constructed 

 as in Dolichopus, short, not or slightly longer than the head, shortest 

 in the female; the arista has a generally somewhat short basal joint, 

 sometimes it is longer; the basal antennal joint has hairs above, and 

 the second joint small bristles at the apical margin; the arista is 

 either apparently bare, only microscopically haired, or it is distinctly 

 short-haired. Epistoma is more or less narrow in the male, broader 

 in the female ; clypeus small, it is only indistinctly marked off by a small 

 elevation on each side, but it is generally bent more or less inwards 

 and thus forming a more or less distinct angle with tlie epistoma; it is 

 slightly, more or less, arched, and it does not reach to the lower 

 margin of the eyes; it has a more or less distinct, longitudinal fur- 

 row. The proboscis and the other mouth parts are larger in the 

 female than in the male. The mouth parts {germanus ^) resemble 

 those in Dolichopus; the proboscis is generally short, only in a small 



