Asilidae. 7 



1. Dasypogoninae. 



Slender or more robust, species. Antennæ four- to five-jolnted, 

 the tliird joint the longest, somewiiat compressed ; it tias at tlie apex 

 a one- or two-jointed style which is blunt or pointed; often the style 

 is indistinctly two-jointed. Legs not speciaily strong. Wings with 

 the subcostal cell open; two cubital cells; between the discai cell 

 and the upper branch of the postical vein a postical cross-vein or in 

 some genera {Leptogaster, Stichopogon) the postical vein lying close 

 to the discai cell and thus no postical cross-vein present; five poste- 

 rior cells, the fourth often somewhat narrowed or (in non-Danish 

 genera) closed; also the tirst sometimes, but rarely, narrovv^ed or closed 

 (in non-Danish genera); anal cell open or closed. 



Tahle of Genera. 



1. Wings relatively short; no postical cross-vein; no pulvilli 1. Leptogaster. 



— Wings not short; a postical cross-vein present; two 



pulvilli 2. 



"1. Antennal style blunt; hind femora and tibiæ with a 



fringe of short hairs on the ventral side 2. Dioctria. 



— Antennal style pointed; hind legs without a fringe 3. 



3. Front tibiæ with a spine at the apex ; no distinct epi- 



stomal callus 4. 



— Front tibiæ without a spine at the apex; an epistomal 



callus present 5. 



4. Spine at the end of the front tibiæ large; epistomal 

 beard reaching half way up towards the antennæ; anal 



cell open; large species 3. Dasypogon. 



— Spine at the end of the front tibiæ small ; epistomal 

 beard reaching to the antennæ; anal cell closed; smaller 



species 4. Leptarthrus. 



5. Epistomal callus not reaching the antennæ 5. Lasiopogon. 



— Epistomal callus reaching to the antennæ 6. Cyrtopogon. 



1. Leptogaster Meig. 



Species of niiddle size and very slender shape, and of greyish or 

 brownish colour. Head somewhat broader than thorax and conside- 

 rably broader than high; it is short and slightly excavated behind. 

 The eyes are large and the epistoma narrow, somewhat widened 

 downwards, without any distinct callus ; the epistomal beard is not dense. 

 Antennæ inserted near to each other, considerably above the middle. 

 Jowls small, only very slightly descending below the eyes. No ocellar 

 bristles present. The antennæ consist of four joints, the two basal 

 joints are short and of equal length, the third joint is oval, compressed. 



