Asilidae. 51 



the lower surface of the tarsi. Claws black, reddish at the outermost 

 base. Empodium reddish. Wings hyaline at the basal half, greyish 

 at the apicai half; veins blaekish, costa with black hairs at the base. 

 Halteres brovvn. 



Fig. 20. Wing of L. gilva. 



Female. With exception of the genital differences quite agreeing 

 with the male. 



Length 15—18 mm. 



L. gilva is not rare in Denmark and has been found in not few 

 localities; Fuglevad, Geel Skov, Ruderhegn, Grib Skov, Tisvilde, Bromme 

 at Sorø; on Funen at Faaborg and in Jutland at Silkeborg and at 

 Hald near Viborg. My dates are ^h — V9. It occurs in woods in districts 

 with pine-trees, especially on localities with high-stemmed trees, and it 

 is here found sitting on the stems watching for prey. During a great 

 invasion of Tomicus typographus in Grib Skov in 1900 the species was 

 very common while it is otherwise somewhat rare there; it was sitting 

 on the stems in great numbers, feeding on the typographs. The larva 

 has been taken in Ruderhegn on ^^/4 under bark of fir and larvæ 

 and pupæ in Geel Skov in a stub of fir on ■''/s. 



Geographicai distribution: — Northern and middle Europe; towards 

 the north to northern Scandinavia; it is not found in Britain. It 

 occurs also in North America in Canada. 



3. L. marginata L. 



1761. Linn. Fn. Suec. 1913 (Asilus). — 1842. Zett. Dipt. Scand. I, 

 163,6 et 1849. VIII, 2976,6. — 1847. Low, Linn. Entom. II, 556, 12. — 

 1862. Schin. F. A. I, 140. — 1903. Kat. palåarkt. Dipt. II, 135. — 1849. 

 L.podagrica Zett. Dipt. Scand. VIII, 2976, 5—6. 



Male. Epistomal cailus black; face above the cailus with white or 

 yellowish hairs which are depressed and directed downwards, so that 

 they cover the upper part of the cailus ; the face is greyish just below 

 the antennæ. Epistomal beard black; above the antennæ and on the 

 vertex there are black hairs. Proboscis black with long, blaekish hairs 

 at the base and short, yellow hairs at the apex; palpi black and black 

 haired. Occiput black, at the eye-margins greyish pruinose; the hairs 

 black above, yellow below. Antennæ black with black hairs on the 



