Aphiochaeta. 337 



87. A. longiseta Wood. 



1909. Wood, Ent. Month. Mag. 2, XX, 26, 61 (Phora). - 1914. Brues, 

 BuU. Wisc. Nat. Hist. Soc. XII, 123. - 1919. Schmitz, Jaarb. Natuurh. Ge- 

 nootsch. Limburg 1918, 160. 



Male. Frons a little broader than high, black, with an indication 

 of a gloss; inner bristle of lower row nearly in the same height as the 

 outer and nearer to it than to the upper supraantennal ; supraantennal 

 bristles nearly equal and somewhat high on the frons, the upper as 

 distant as the inner bristle of middle row, the lower more approximate. 

 Antennæ small, black, arista long, longer than usual, short-pubescent. 

 Palpi yellow, of ordinary size, with well developed bristles. Thorax 

 black, somewhat shining, with dark brownish pubescence. Mesopleura 

 bare. Abdomen black, dull; the very sparse hairs almost not visible, 

 only at the sides and at the hind margin of sixth segment slightly 

 longer. Hypopygium somewhat large and of a curious shape; it is 

 greyish, black and shining above just at base; it is unsymmetrical, 

 the left side large and of common shape, but the right side quite 

 short, and between it and the sixth segment there is an almost semi- 

 circular plate (perhaps the right side in reality is deeply fissured); 

 on the left side there are some small hairs below at the base, the 

 lower margin of the short right side (or of the fissure) has a row of 

 hairs; the ventral plate is long and furcated, with the arms a little 

 spread; anal tube somewhat large, yellow, more or less darkened at 

 the base, and hanging curiously downwards ("just as cattle carry 

 tlieir tails in repose" Wood). Legs brown or blackish brown, front 

 legs including coxæ yellow; front tarsi somewhat stout; hind femora 

 rather broad, the hairs below short, just below the base there are 

 some strong, curved hairs, forming a little comb; bristles on hind 

 tibiæ somewhat strong, those on the middle the longest. Wings 

 brownish or greyish brown, veins brown, thin veins somewhat strong; 

 costa reaching considerably beyond the middle, 1 about equal to 2 + 3, 

 or generally a little shorter; costal cilia short; angle at fork not large; 

 fourth vein somewhat strongly curved in its basal part. Halteres black. 



Female. Similar; front tarsi likewise stout, but hind femora 

 without special hairs below the base. 



Length. The species varies somewhat in size, the length from 

 scarcely 1 to 1,7 mm. 



A. longiseta is not rare in Denmark; Ermelund, Dyrehaven, Lyng- 

 by Mose, Geel Skov and in Jutland at Ry (the author); the dates are 

 ^Vs— ^/s in 1918 and 1920. It frequents humid and boggy piaces in woods. 



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