108 Orthorrhapha brachycera. 



Geographical distribution : — Northern and middle Europe down 

 into France, and in England ; it seems to have its northern limit in 

 Denmark. 



VI. Subg. PtereTupis Bezzi. 

 Small or medium sized, dark or greyish species. Eyes contiguous 

 in the male, whith the upper facets larger than the lower; in the 

 female separated. Antennæ short, the two basal joints about of equal 

 length, the third not long. Dorsocentral and acrostichal bristles bi- 

 serial, the former rarely pluriserial. A humeral bristle, a posthumeral, 

 two to four notopleural, one, rarely several supraalar and one postalar 

 bristle. Generally some hairs on the sides of the disc. Metapleural 

 hairs numerous. Scutellum with two to four marginal bristles. Ab- 

 domen without bristles. Male genitalia small or of medium size, some- 

 times somewhat larger. Legs with bristles; front or hind metatarsi 

 or both pairs in the male more or less thickened; middle tibiæ with 

 a short, fine, erect pubescence on the anterior side. In the female 

 the legs nearly always more or less compressed and pennate. Wings 

 with the axillary lobe well developed^ axillary angle acute or rect- 

 angular; the discai cell more or less truncate outwards. Veins com- 

 plete, rarely the anal vein abbreviated. 



• This subgenus, in which the females nearly always have pennate 

 legs, includes the hovering species. 



TabJe of Species. 



1. Halteres whitish or yellow 2. 



— Halteres black 7. 



2. Abdomen clothed with blackish or brownish hairs 3. 



— Abdomen clothed with whitish or yellowish hairs 5. 



3. Abdomen black, or more or less testaceous at the base ; 



legs in the female pennate; size 4,2 — 5,6 mm 5. 



— Abdomen grey ; legs in the female not pennate ; size 



3,5 mm 23. cinerea. 



4. Abdomen black ; præsutural depression somewhat haired ; 

 wings blackish; female with the anterior metatarsi 

 pennate above, and the hind tibiæ pennate below in 



the whole length 13. pennipes. 



— Abdomen more or less testaceous at the base; præ- 

 sutural depression bare; wings not blackish, at most 

 slightly brownish; female with the anterior metatarsi 

 not pennate, hind tibiæ pennate below only in the 



basal half 14. rufivetitris. 



5. Scutellum with four marginal brisdes 6. 



— Scutellum with two marginal bristles 17. lamellicornis. 



6. Wings in the male somewhat tinged; middle femora 

 with the bristles below not tuft-like at the base; front 

 metatarsi in the female pennate above 15. decora. 



