30 Orthorrhapha brachycera. 



extended on the front tibiæ; the rniddle tibiæ have a similar pube- 

 scence but only just at the apex; the tarsi show the same dense 

 pubescence on the lower surface. The claws are somewhat strong; 

 there are two pulvilli and a bristle-shaped empodium which is thick 

 at the base but very thin outwards. Wings with the subeostal eell 

 open, the cubital vein forked ; a postical cross-vein between the discai 

 cell and the upper branch of the postical vein; there are five posterior 

 cells, these and the anal cell all open. Alula well developed. Alar 

 squamula hairy at the margin. 



So far as I am aware the larval and pupal stages of this genus 

 are not known. 



The species of Dasijpogon are somewhat robust and heavy and 

 with a somewhat slow flight. They are recorded especially to frequent 

 sunny, dry localities often sitting on the ground or on leaves but not 

 on .stems. 



Of the genus 5 species are known from the palæarctic region; 

 one has hitherto been found in Denmark. 



1. D. teutonus L. 



1758. Linn. Syst. Nat. Ed. X (Asilus). — 1847. Low, Linn. Entom. II, 

 448,5. - 1862. Schin. F. A. I, 124. — 1903. Kat. palåarkt. Dipt. IL 108. 



Male. Face bright yellovv pruinose; epistomal beard yellow. 

 Proboscis and palpi black, the latter with black hairs. The pruinosity 

 of the face proceeding up above the antennæ on each side and thus 

 the frons yellow on the sides but black in the middle. Vertex black. 

 On the sides of the frons there are black hairs, and there are two 

 black ocellar bristles. Occiput black with black hairs. Antennæ fer- 

 rugineous, the apex of the style darkened; the hairs on the two flrst 

 joints and on the upper side of the third joint black. Thorax duU, 

 dark brownish above, a broad marginal stripe golden yellowish prui- 

 nose, just in front of the scutellura the stripe is greyish ; in the middle 

 of the disc there are two closely placed, faint dark stripes uniting 

 behind; when the thorax is viewed quite from in front other yellow 

 reflections are seen. Scutellum black. Thorax is very sparingly clothed 

 with short, blackish hairs ; the bristles of the different categories are 

 black. Pleura brownish black, slightly shining, with a small spot 

 above the front coxæ, a large middle spot and the hinder part of the 

 hypopleura golden yellow pruinose. The long hairs on the metapleura 

 yellow or black. Abdomen black, somewhat shining, very short and 

 sparingly black pubescent; at the lateral margins of the first seg- 

 ment long, ferrugineous hairs; at the hind margins of the second to 

 sixth segments a grey pruinose spot on each side, smallest on the 



