Asilidae. 77 



15. Macliiinus L6w. 



Species of medium size and greyish or browiiish colour. Face 

 somewiiat broad, widened downwards; epistomal calius inore than 

 half the length of epistoma. Antennæ inserted somewhat above the 

 middie, the basal joint with long hairs below. The facets in the front 

 part of the eye distinctly enlarged. Dorsocentral bristles continued to 

 the middie of thorax. Abdominal segments with bristles at the hind 

 margins. Front femora without spine-like bristles on the ventral side 

 (in the Danish species; a few of the foreign species have spine-like 

 bristles either in the female or in both sexes). Male genitalia small, 

 forceps simple; the ventral lamella not shining; the eighth ventral 

 segment with a prolongation from the hind margin. Female ovipositor 

 compressed, pointed, with free, styliform lamellæ. — The Danish spe- 

 cies, ntricapillus, has more slender legs and a somewhat narrower 

 face than is otherwise the case in the genus. 



Of the genus 26 palæarctic species are known; one has hitherto 

 been found in Denmark. 



1. M. atricapillus Fall. 



1814. Fall. Dipt. Suec. Asil. \0,b{Asilus). — \Si± Zett. Dipt. Scand. 

 1, 168, 4 et 1855. XII, 4564, 4 et 1859. XIII, 4961, 4 [Asilus). — 1849. Low, 

 Linn. Entom. IV, 31. 30. — 1862. Schin. F. A. I, 150 (Asilus). — 1903. 

 Kat. palåarkt. Dipt. II, 152. 



Male. Eyes in the living specimens slightly metaUic, brownish 

 with a slight greenish cast. Face greyish white, grey in the middie; 

 epistomal beard black, in the lowermost part white or yellow. Palpi 

 black with yellow, sometimes blackish hairs. Occiput grey; occipito- 

 orbital bristles black, the hairs pale yellowish to snow-white. Frons 

 and vertex grey with black hairs. Antennæ black, first and second 

 joint with black, or black and jellow hairs which are somewhat long 

 on the lower side of the first joint. Thorax light grey, the middie 

 stripe blackish brown, broad in front, narrowed behind, with an in- 

 distinct middie line in front; the side stripes not large, grey and thus 

 not differing much from the ground colour; betw^een the middie stripe 

 and the side stripes a narrow dark, distinct stripe; a curved humeral 

 stripe visible. The disc clothed with short, erect, black hairs, longer 

 behind; the bristles black. Scutellum with erect, yellowish hairs 

 and a few black, marginal bristles. Pleura greyish pruinose with 

 some longer, partly black, partly yellowish hairs; the long hairs on 

 meta- and hypopleura black and ferrugineous or quite whitish. Ab- 

 domen greyish or brownish with an indistinct, darker brown middie 

 line; with the light from behind it is blackish brown, slightly shining, 



