Aphiochaeta. 349 



small apical hairs. Legs yellow, hind femora blackish just at apex 

 and with sparse, long hairs below the basal half ; bristles on hind tibiæ 

 somewhat numerous (about 16); they are quite small and fme in the 

 upper third, but somewhat well developed in the lower two thirds. 

 Wings more or less yellowish, sometimes brownish, veins yellow to 

 brown; costa reaching well beyond the middle, 1 shorter than 2, 



Fig. 104. Wing of A. flava c? . 



rarely of the same length; costal cilia very short; angle at fork not 

 large; fourth vein issuing slightly S-like, curved in its first part, then 

 nearly straight, but again curved upwards at apex. Halteres yellow. 



Female. Similar to the male ; abdomen similarly varying in colour ; 

 hind femora likewise with long hairs below. 



Length 1,4 — 2,2 mm. 



Wood says about the ventral plate (ventral processes) that the 

 left is broader than the right; so far as I could see they are alike, 

 perhaps a little unsymmetrical. — I have seen Zetterstedt's specimens, 

 and I can confirm Becker's statement that they are identical with 

 our species. 



A. flava is common in Denmark and present in all suitable local- 

 ities all over the country and during the whole season; my dates are 



19/ 3/ 



U — /il. 



Geographical distribution: — Common and widely distributed 

 over all Europe down into Spain and Italy, towards the north to middle 

 Sweden and Finland; it is further recorded from Formosa, and it 

 occurs in North America, the East Indies, and is also recorded from 

 New Guinea. 



98. A. mixta Schmitz. 



1918. Schmitz, Entom. Ber. Nederl. Ent. Ver. V, 61 et 1919. Jaaib. 

 Natuurh. Genootsch. Limburg 1918, 162. 



Male. Frons broader than high, greyish black, dull; inner bristle 

 of lower row in about the same height as the outer and nearer to it 



