Aphiochaeta. 353 



and a little longer at the hind margin of sixth segment. Hypopygium 

 of medium size, greyish black, with short hairs below on the sides; 

 there is a flap-like, diisky ventral plate; anal tube of medium size, 

 yellowish, a little dusky. Legs yellow or yellowish, the three first 

 joints of front tarsi a little broad; hind femora with long, sparse hairs 

 below the basal half; bristles on hind tibiæ fine. Wings very slightly 

 yellowish, veins brownish; costa reaching about to the middle, 1 a 

 httle longer than 2+3 (perhaps about as 7 — 4 — 2) ; costal cilia moder- 

 ately short; fourth vein somewhat curved in its first part, for the rest 

 nearly straight. Halteres yellow. 



Length 1,2 — 1,4 mm. 



Female. The female is not known, but I possess a specimen 

 which may possibly belong here; it agrees well, but has the front 

 tarsi simple and first costal division relatively a little longer. The 

 length is 1,6 mm. 



A. anisodactyla is rare in Denmark, I possess only two males, 

 Holte and Suserup Skov at Sorø (Th. Mortensen), they were taken 

 on ^V? and *^/8 1918; the possible female is taken at Ry in Jutland 

 ^77 1918 (the auhtor). 



Geographical distribution: — Besides from Denmark only known 

 from Holland. 



101. A. frontalis Wood. 



1909. Wood, Ent. Month. Mag. 2, XX, 119, 147 {Pliora). - 1914. Brues, 

 Bull. Wisc. Nat. Hist. Soc. XII, 119. 



Male. Frons slightly broader than high, almost quadratic, black, 

 slightly shining and rather hairy; inner bristle of lower row below the 

 outer, about in the middle between the eye-margin and the upper 

 supraantennal; supraantennal bristles large and equal, the upper 

 more distant than the inner bristles of middle row, the lower more 

 approximate. Antennæ somewhat large, brownish black, arista short- 

 pubescent. Palpi somewhat large and prominent, deep yellow, with 

 ordinary or a little shortish bristles. Thorax black, a little shining, 

 with blackish brown pubescence. Mesopleura bare. Abdomen black, 

 dull, the short hairs slightly longer at the hind margins of the seg- 

 ments, longest on sixth segment. Hypopygium not small, greyish 

 black; it has distinct and somewhat dense hairs below^ on the sides, 

 and there is a somewhat small, dusky yellow ventral plate; anal 

 tube not long, but somewhat high, greyish brown, the apical hairs 



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