Asilidae. 53 



hyaline on the basal half and hence more evenly brown, and the hairs 

 at the base of the costa black. 



Length. This species varies considerably in size, the length being 

 9—14 mm. 



The pupa has a length of 12 mm. 



L. marginata is not common in Denmark, but yet from time to 

 time taken in not small numbers; Dyrehaven, Geel Skov; on Lolland 

 at Maribo and Frejlev; on Funen at Lundeborg on the eastern coast 

 and at Langensø; in Jutland at Frijsenborg and Støvring near Ran- 

 ders, finally on Bornholm in Ekkodalen. My dates are ^^/e— ^/o. Pupæ 

 have been taken in Dyrehaven in decaying wood and in Polyporus. 

 The species occurs in woods of foliferous trees generally sitting on 

 the stems. 



Geographical distribution: — Northern and middle Europe dow^n 

 into France ; towards the north to the northern parts of middle Scan- 

 dinavia. 



3. Asilinæ. 



The genera of Asilinæ, enumerated in the following, were, as is 

 well known, established as groups in Lov^'s valuable monograph; 

 since then they have generally been treated as genera, yet they have 

 been rejected by some authors, e. g. Pandellé (Rev. d'Entomol. publ. 

 par la Soc. Franc. d'Entom. XXIV, 1905, 45), who consider them as one 

 genus, Asilus. Though it cannot be denied that as genera they are 

 far more closely allied and taken in a much more narrow sense than 

 genera are commonly, I shall yet retain them here, chiefly because 

 they are generally in use and at all events give valuable hints about 

 the natural classification of the species; but I shall, on account of 

 the narrow sense in which they are taken, give a common generic 

 description under the heading of Asilinæ. 



The species of the Asilinæ are of medium to large size and of a 

 somewhat long, slender shape ; they are generally of a dull, brownish 

 to greyish colour, rarely more lively coloured. Head as broad as, or 

 somewhat broader than thorax and somewhat broader than high, 

 short, and flat on the posterior surface. The eyes are large, the face 

 somewhat broad, or more narrow, somewhat widened below; there is 

 a distlnct and generally large epistomal callus above the clypeus, bearing 

 a long and dense epistomal beard the hairs of which are curved 

 downwards. Antennæ inserted near to each other, somewhat above 

 the middle. Jowls somewhat but generally only slightly descending 

 below the eyes. No individualised ocellar bristles. A row of occipito- 

 orbital bristles along the upper part of the posterior eye-margin. 



