Empididae. 265 



Of the genus 6 to 9 species are known from the palæarctic region 

 (tiiree are doubtful); two have hitiierto been found in Denmark. 



Tahle of Species. 



1. Thorax somewhat shining; wings brown with base and 



apex hyaline ; front tibiæ not thickened 1 . fnscipennis. 



— Thorax pruinose, dull; wings with the cubital and the ba- 

 sal part of the postical vein brownish searaed ; front tibiæ 

 somewhat thickened 2. nubila. 



1. T. fuscipennis Fall. 



1815. Fall. Dipt. Suec. Empid. 14, 19 {TacMjdromia). — 1822. Meig. 

 Syst. Beschr. III, 71, 5 {Tachydromia), et 1838. VII, 95, 6. — 1842. Zett. 

 Dipt. Scand. I, 315, 4. — 1860. Loew, Zeitschr. fiir Entom. Breslau. XIV, 

 14, 3. — 1862. Schin. F. A. I, 93. — 1903. Kat. palåarkt. Dipt. II, 275. 



Male. Frons and vertex greyish black; palpi whitish, with black 

 bristles. Occiput grey, with a few black bristles above, and densely 

 beset with whitish hairs below, the hairs forming a longitudinal stripe 

 on each side. Antennæ yellow. Thorax black, somewhat shining, 

 with a slight and very short pubescence. There are two black, noto- 

 pleural bristles. Scutellum with two black marginal bristles. Pleura 

 black, shining, a little pruinose downwards and towards behind. Ab- 

 domen blackish brown or brownish, with a very sparse and short, 

 pale pubescence. Venter similarly coloured, the last ventral segment 

 with long hairs. The exterior genitalia black. Legs yellow, on the 

 hind legs the femora, the tibiæ except the base and the tarsi, except 

 the base of the metatarsus, brownish; also the anterior tibiæ may be 

 a little brownish. Front tibiæ not thickened, slightly curved, and also 

 the middle tibiæ very slightly curved. The legs are short-haired with 

 pale hairs, the middle coxæ and the base of the middle femora have 

 a few blackish bristles; the front femora with a short, dense pube- 

 scence below. Wings more or less brown with the base and the 

 apex clear, thus they may also be described as having a broad, brown 

 middle band; the colour is darkest towards the anterior margin. Veins 

 paler or darker brownish. Halteres whitish yellow. 



Female. Similar to the male; the ovipositor black; the bristles be- 

 low the base of the middle femora stronger. 



Length 2,8 to fuUy 3,5 mm. 



T. fuscipennis is rare in Denmark, I know only four specimens, 

 a male and three females; vicinity of Copenhagen, Ordrup and on 

 Lolland at Maribo; the dates are ^h—^'^li. It occurs generally on the 

 stems of trees. 



