Bombyliidae. 109 



yellow scales above. Squamulæ blackish with a white fringe ; frenulum 

 white haired. Halteres yellowish, the knob yellowish white. 



Feniale. Agreeing with the male but the vertex and frons con- 

 siderably broader, the ey e-margins diverging just from the upper 

 corner. 



Length 8— 12 mm. The species seems to vary less in size than 

 most other species. 



The full grown larva has a length of 10 — 12 mm., and the pupa 

 has a similar length; the latter has a very strong armature on the 

 front side of the head, consisting of four tubercles, placed in a qua- 

 drate, each produced in three strong spines; on the lower surface of 

 the head there are two spines in the middle. 



This beautiful species is easily recognised both by the spotted 

 wings and by the colouring of the abdomen. 



A.fenestratus is not rare in Denmark; Tisvilde, Rørvig; on Funen 

 at Faaborg; in Jutland at Silkeborg, Hald, Kandestederne south of 

 Skagen and on Læsø ; fmally on Bornholm at Rønne and Hasle. My 

 dates are Vi—'^h. It flies in the sunshine on sandy piaces, especially 

 near the shore, and often in pine-woods; it is generally seen sitting 

 on the sand. 



Geographical distribution: — All Europe and down into North 

 Africa; towards the north to Lapland but there rare. 



2. A. maurus L. 



1761. Linn. Fn. Suec. 1785, p.p. {Musca). — 1842. Zett. Dipt. Scand. 

 I, 198, 5 et 1855. XII, 4584, 5. - 1862. Schin. F. A. I, 49. — 1903. 

 Kat. palåarkt. Dipt. II, 178. — 1820. A. bifasciatus Meig. Syst. Beschr. II, 

 156, 24, Tab. XVII, Fig. 15. 



Male. Black; frons and epistoma with erect, black hairs, and 

 with some depressed, golden hairs; occiput greyish black with depressed, 

 golden hairs, a short fringe of black hairs along the posterior margin. 

 Antennæ black, the basal joints with black hairs; the third joint with 

 a short basal part and a long, styliform part. Thorax black, velvet 

 pruinose and with some depressed, golden hairs; besides, it is sparingly 

 clothed with erect, blackish or brownish hairs which at the front 

 end form a dense fringe, this is reddish yellow above, blackish down- 

 wards; at the lateral margins of the thoracic disc there are two 

 longitudinal bands of whitish or yellowish white hairs. The pleura have 

 long, black hairs, more or less intermingled with yellow hairs; the 

 metapleura have a tuft or vertical row of somewhat long, yellow hairs. 

 Abdomen likewise velvet black and with depressed, golden, or more 

 copper coloured hairs; at the base there is a fringe of erect, yellow 



