Aphiochaeta. 333 



Male. Frons only slightly broader than high, blackish, slightly 

 shining; inner bristle of lower row a little below the outer and placed 

 in the middle between it and the iipper supraantennal ; supraantennal 

 bristles about equal, the upper about as distant as the inner bristles 

 of middle row, the lower more approximate. Antennæ small, black, 

 arista short-pubescent. Palpi dark yellow, of ordinary size and arma- 

 ture. Thorax black, slightly shining, with blackish brown pubescence. 

 Mesopleura with distinct, uniform bristles. Abdomen robust, black, 

 a little greyish, dull, it has short hairs, almost not longer at the hind 

 margins of the segments, only at the hind margin of sixth segment 

 a little longer. Hypopygium small and withdrawn, greyish black, 

 only with some small, inconspicuous hairs on the sides; below there 

 is a large, flap-like, dusky yellowish ventral plate, reaching to the end 

 of the hypopygium; anal tube short, but stout, dusky yellowish or 

 darker. Legs blackish brown, front legs, especially tibiæ and tarsi 

 paler; hind femora and tibiæ a little strong, the hairs below hind 

 femora short; bristles on hind tibiæ small, but fully distinct, rather 

 numerous. Wings nearly clear, but, however, a little yellowish, veins 

 pale brown or yellowish; costa about 0,37 of the wing-length, costal 

 divisions about as 22 — 7 — 5; costal cilia very long; angle at fork not 

 small; fourth vein evenly and slightly curved. Halteres deep yellow. 



Female. I have not seen the female; according to Wood, it 

 seems to be similar to the male. 



Length 1,5 mm or nearly, after Wood 1,25 — ^1,75 mm. 



Wood says that 1 is double 2 + 3, as seen above 1 is not quite 

 so long in my specimens, I nevertheless think that my determination 

 is correct as the specimens are otherwise well agreeing. 



A. simplex is rare in Denmark, only two specimens, both males, 

 have been taken on Bogø south of Sealand ^V? 1917 (the author). 



Geographical distribution: — The species is otherwise only known 

 from England. 



84. A. superciliata Wood. 



1910. Wood, Ent. Month. Mag. 2, XXI, 244, 247 {Phora). - 1914. Brues, 

 Bull. Wisc. Nat. Hist. Soc. XII, 134. 



Male. Frons considerably broader than high, greyish black, dull ; 

 inner bristle of lower row very slightly below the outer and nearer 

 to it than to the upper supraantennal; supraantennal bristles some- 

 what large, equal, the upper as distant as the inner bristles of middle 



