Aphiochaeta. 417 



of the segments, and here increasing in length behind; on the sixth 

 segment the hairs at the hind margin form a row of long bristles all 

 round, but shorter on the ventral side. Hypopygium small, greyish, 

 with numerous hairs on the sides; anal tube small, dusky yellow. Legs 

 yellow, hind femora not or slightly darkened at apex, with sparse, 

 somewhat long hairs below the basal half; bristles on hind tibiæ fine, 

 but distinct and not quite short. Wings yellowish, veins brown or 

 pale brown; costa about 0,43 of the wing-length, costal divisions 

 about as 11 — 6 — 4, thus 1 about equal to 2 + 3; costal cilia long; 

 fourth vein somewhat curved at the origin, for the rest very slightly 

 curved. Halteres yellow. 



Female. Unknown. 



Length 1,5 mm. 



A. spinicincta is rare in Denmark, only two specimens, both 

 males, have been taken, Hillerød ^Vv 1917 and Suserup Skov at 

 Sorø ^Vt 1918 (Th. Mortensen). 



Geographical distribution: — Besides in Denmark occurring in 

 England and, according to a communication from Pater Schmitz, 

 in Holland, and it is also known from Prussia (Schmitz, Tijdschr. v. 

 Entom. LXIV, 1921, 4). 



153. A. sylvatica Wood. 



1910. Wood, Ent. Montli. Mag. 2, XXI, 245, 248 (PJiora). — 1914. Brues, 

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



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

 bristles strong, inner bristle of lower row in about the same height 

 as the outer and in the middle between it and the upper supraantennal ; 

 supraantennal bristles unequal, the lower rather small; the upper 

 supraantennals approximate, less distant than the inner bristles of 

 middle row, the lower still a little nearer together. Antennæ smallish, 

 brownish black, arista short-pubescent. Palpi yellow, not large, 

 with ordinary bristles. Thorax black, very slightly shining, with 

 brownish pubescence. Mesopleura bare. Abdomen black, a little grey- 

 ish, dull; the very short hairs scarcely longer at the hind margins of 

 the segments, only on sixth segment a little longer. Hypopygium 

 somewhat small, greyish black, with short hairs on the sides below, 

 the lower hinder corners drawn a little out; ventral plate yellowish, 

 somewhat flap-like, reaching to near the end of the hypopygium; 

 anal tube yellow, of medium length, but high. Legs brownish yellow. 



