Aphiochaeta. 307 



mesopleural bristles; the new material has necessitated a few alter- 

 ations in my first description. 



62. A. dubiosa Lundbk. 

 1921. Lundbk. Vidensk. Meddel, fra Dansk naturh. Foren. 72, 135, 6. 



Male, Frons somewhat broader than high, greyish black, dull; 

 inner bristle of lower row a little below the outer and much nearer 

 to it than to the upper supraantennal; siipraantennal bristles nearly 

 equal, the upper about as distant as the inner bristles of middle row, 

 the lower a little weaker and nearer together. Antennæ black, of 

 ordinary size, arista short-pubescent. Palpi yellow, of ordinary size, 

 with well developed bristles. Thorax black, a little shining, with brown- 

 ish pubescence. Mesopleura with small, uniform bristles. Abdomen 

 black, dull, with short hairs as usual, slightly longer at the hind mar- 

 gins of the segments and on the sixth segment they are only quite 

 slightly longer. Hypopygium small, greyish black, on each side below 

 there are about three small, vertically placed hairs, and more above 

 on the hind part still a couple of hairs; anal tube medium-sized or 

 small, blackish. Legs brownish or darker to blackish brown, the front 

 legs only slightly paler; hind femora with sparse, long or longish 

 hairs below the basal half; bristles on hind tibiæ distinct, but small. 

 Wings clear or very slightly tinged, veins brownish, thin veins paler; 

 costa not reaching to the middle, rather short, about 0,45 of the wing- 

 length, costal divisions about as 11 — 6 — 4, thus 1 about equal to 

 2 + 3; costal cilia of ordinary length; angle at fork somewhat small; 

 fourth vein slightly and evenly curved in the whole length. Halteres 

 black. 



Female. I possess a female w^hich may belong here; it seems to 

 agree well with the male, but I am, however, not sure that it is really 

 the female of this species. 



Length 1,5 mm. 



A. dubiosa seems to be rare; Holte, Hillerød (Th. Mortensen) and 

 Ry in Jutland (the author); the dates are ^V?— ^Vs in 1917 and 1918; 

 the possible female I took in Ermelund ^Vs 1919. 



Geographical distribution: — Only known from Denmark. 



Remarks: This species is not very characteristic; it is one of 

 the rather numerous species belonging to the group with costa longer 

 than 0,44, long costal cilia, uniform mesopleural bristles, simple 

 front tarsi and black halteres. In Wood's table it will run down to 



20* 



