Aphiochaeta. 413 



149. A. fuscohalterata Schmitz. 

 1919. Schmitz, Entom. Ber. Nederl. Ent. Ver. V, 142, 144. 



Male. Frons broader than high, blackish grey, dullish or with 

 an indication of being shining; sometimes it is reddish at the lower 

 corners; inner bristle of lower row below the outer and nearer to it 

 than to the iipper supraantennal ; supraantennal bristles uneqiial, 

 the lower qiiite small; the upper siipraantennals a little more ap- 

 proximate than the inner bristles of middle row and the lower seem 

 to be slightly more approximate. Antennæ black to reddish brown, 

 a little large; arista distinctly though short-pubescent. Palpi yellow, 

 of ordinary size and armature. Thorax black to brown or reddish 

 brown, a little shining, with brown piibescence. Pleura varying in 

 colour like the dorsiim, but generally paler. Mesopleura bare. Abdomen 

 black, diill; the short hairs almost only visible at the hind margins 

 of the segments; venter yellow to dark brown or blackish, not strongly 

 haired as in halterata. Hypopygium somewhat small, greyish black 

 or brownish, with three or four bristles on each side below at the 

 base and in a nearly vertical or more obliqiie row, and, besides, with 

 some smaller hairs upwards; anal tube small, yellow or more or less 

 dusky. Legs yellow or yellowish, hind femora with longish hairs below 

 the basal half; bristles on hind tibiæ visible, but small and fme. 

 Wings yellowish or brownish, veins pale to dark brown; costa about 

 0,43 of the wing-length, costal divisions about as 18 — 8 — 5 (or about 

 the same as Schmitz gives viz 11 — 5 — 3); third vein a little thick; 

 angle at fork not small, sometimes rather acute and then the fork 

 longish; costal cilia long or more moderately long; fourth vein evenly 

 curved in the whole length and not or almost not recurved at apex. 

 Halteres brown to yellow. 



Female. Similar to the male; the angle at fork always acute. 



Length 0,8 to about 1,5 mm. 



Remarks: I do not feel sure as regards this species, the specimens 

 in my material varying to no slight degree; as described above they 

 vary in colour and as regards the fork and its angle; further the an- 

 tennæ may be smaller than described, the colour of the wings varies 

 and likewise the length of the costal cilia; that the hypopygium shows 

 three or four bristles is, I think, of no consequence, for it may be due 

 to one of the hairs being specially developed, and for the rest the 

 exact number is often difficult to decide; the costal divisions and the 

 fourth vein, on the other hånd, are rather constant. I have examined 



