Empididae. 



167 



15. H. Beckeri Strobl. 

 1892. Strobl, Verh. zool. bot. Gesell. Wien, XLII, 143, 32. — 1903. 

 Kat. palåarkt. Dipt. II, 248. 



Male. Frons and vertex velvet black, above the antennæ a tri- 

 angiilar, grey spot; epistoma grey; palpi black, with black hairs. 

 Occiput velvet black above, with black hairs, chiefly present along the 

 eye-margin; below the occiput is grey. Antennæ black. Thorax some- 

 what dark grey, with four brownish black stripes, the median stripes 

 abbreviated behind, the lateral in front ; the median stripes are distant, 

 the lateral very near to the median, almost or really confluent with 

 them. The dorsocentral and acrosticlial bristles short, black; the for- 

 mer uniserial, longer behind, the latter quadriserial but somewhat 

 irregularly. Further a humeral bristle, a posthumeral, two (some- 

 times three) notopleural, a supraalar and a postalar bristle, all black. 

 Scutellum with four black marginal bristles. Pleura grey. Abdomen 

 dark grey, darkest to almost black along the dorsum; it is clothed 

 with yellowish hairs and has fine, yellow or brownish bristles at the 

 hind margin of the segments; in the apical part and along the middle 

 above the hairs and bristles are darker or black. 

 Venter grey, with short, pale hairs. Exterior genitalia 

 somewhat small, compressed, short-haired with dark 

 hairs, the lamellæ not shining. Legs black, somewhat 

 greyish pruinose; the knees narrowly reddish; coxæ 

 grey; hind femora black, shining on the posterior 

 side. Front femora with fine hairs on the posterior 

 side; middle femora with bristly hairs on the anterior 

 side; hind femora short-haired; front tibiæ with fine 

 hairs on the dorsal side, and with some slightly 

 longer, very fine, bristly hairs, the pair at the apex 

 longest; middle tibiæ with a row of longish hairs on 

 the anterior side and with short bristles on the 

 antero- and postero-ventral side; hind tibiæ with 

 bristles on the anterior and dorsal side. Front meta- 

 tarsi thickened, about three fourths of the tibiæ in 

 length, and scarcely as long as the four foUowing ^^^^^ jg^ ^ ^0. 

 joints; they are short-haired; the three middle joints 

 longer than broad on all tarsi. The hairs are brown to blackish, the 

 bristles and bristly hairs black. Wings hyaline or slightly greyish. 

 Veins black; the upper branch of the cubital vein somewhat diverging, 

 not curved. Stigma black. Halteres yellow. 



Female. Similar to the male. Front metatarsi simple, not half 

 as long as tibiæ, and as long as the three foUowing joints; the other 



Fig.6L H. Beckeri, 



