22 Platypezidae. 



imens, 4 mm. I shoiild have considered them a new species, were it 

 not that the length of third antennal joint and the bristles are varying 

 in antennata, and the bristles seem just to vary in accordance with 

 the size. I can therefore only consider them as specially strong spec- 

 imens. 



4. A. viduella Zett. 



1838. Zett. Ins. Lapp. 531, 6 {CaUoniyza) et 1844. Dipt. Scand. III, 921, 

 13 (Callomyia). — 1900 Verr. Cat. eur. Platyp. 5. — 1903. Wood, Ent. Month. 

 Mag. 2, XIV, 271, fig. — 1907. Kat. palåarkt. Dipt. III, 186. -- 1910. Wahlgr. 

 Entom. Tidsskr. 232, 2. 



Of this species I know only the female, so that as regards the 

 male I must reproduce from Wood. The species is velvet black. The 

 legs darker than in antennata; hind legs with tibiæ and tarsi well 

 dilated, especially metatarsus. The peculiar bristle at base of front 

 femora present, but somewhat weak; no bristle on front tibiæ at 

 posteroventral side near apex and no bristle below middle meta- 

 tarsi, but a dorsal bristle on middle tibiæ present; the bristle below 

 base of hind femora present. 



Female. Frons broad, black and highly pohshed. Antennæ 

 black, third joint elongate, but not much more than twice as long 

 as broad. Thorax and abdomen all velvet black, the former seen 

 from in front with a slightly greyish spot behind. Abdomen very 

 sparingly short-haired, but with more and longer hairs at base; 

 sixth segment with hindmarginal bristles both above and below. 

 Legs brownish yellow, hind tibiæ and tarsi darker, anterior tarsi 

 blackish towards end; hind tibiæ and four first joints of tarsi somewhat 

 dilated, middle tarsi with the three middle joints distinctly dilated, 

 especially third and fourth. Of bristles only the spur on middle tibiæ 

 present. Wings very slightly yellowish. Halteres with the peduncle 

 yellow, the knob black. 



Length fully 2,5 mm. 



A. viduella is very rare in Denmark, I possess two females, Erme- 

 lund 14/5 1921 (the author) and on Funen at Hvidkilde ^^U 1919 

 (Mrs. Zimsen). 



Geographical distribution: — Northern and middle Europe 

 down into Styria; towards the north to middle Scandinavia and in 

 Finland. It is everywhere a very rare species. 



