28 hairs; bristles on hind tibiæ rather small but distinct. Wings yel- lowish, veins yellow or pale brownish ; costa about 0,42 of the wing-length, costal divisions proportionately about as 11—4— 3; costal cilia long; fourth vein almost not curved in its first part, carved upwards towards the end and a little recurved at apex. Halteres yellow or pale yellow. — - Female. Antennæ somewhat smaller; abdomen without the characteristical pale colouring; from the female of halteraia it will be known by the want of dense hristles on the hinder part of the venter and the longer costa. Length 1,2— 1,7 mm. This curious species is not uncommon here, Copenhagen, Erme- lund, Holte, Tisvilde and Bogø south of Sealand -^/:)— ^^8 in 1917 and 1918 (Th. Mortensen, the author); it is sometimes taken on Windows. 32. A. plurispinosa n. sp. (^ Likewise near hallerata but besides by other characters dis- tinguished by a more bristly hypopygium. Male. Frons broader than long, greyish black; inner bristle of lower row a little lower than the outer and equally distant from it and from the upper supperantennal bristle ; supraantennals small, unequal, the lower about half as large as the upper; the upper supraantennals slightly more approximated than the inner bristles of the middle row, the lower direct beneåth the upper, almost not nearer together. Antennæ a little above ordinary size, black, arista very short pubescent. Palpi yellow, of ordinary size and ar-: mature. Thorax black, slightly shining; mesopleura bare. Scutel- lum with two bristles. Abdomen somewhat robust, black, with narrow pale hind margins to the segments; the lateral margins and the last segment rather hairy : venter yellowish brown, the hinder part densely bristly as in halterata. Hypopygium somewhat small, greyish ; on each side there is an oblique row of four bristles which are directed downwards. and above and behind them some smaller hairs decreasing in size upwards; anal tube yellowish, dusky towards base. Legs light brownish yellow, hind femora brown at tip, with a few longish hairs below the basal part; brist- les on hind tibiæ distinct but fine. Wings yellowish, veins brown, second vein somewhat thick ; costa 0,4o of the wing-length, costal .
29 jivisions proportionately about as 11 — 3—3; angle at fork some- jvhat acute ; costal cilia long; fourth vein almost straight in its first jart, curved upwards towards the end and a little recurved at apex. balteres yellow. Length 1,? mm. 'Copenhagen ^Ve 1919 (the author); one male taken on a vindow. 33. A. cinerella n. sp. (^ A species near exigua Wood but with dusky palpi, blackish egs and a shorter costa. Male. Frons somewhat broader than long, black, slightly grey- sh : bristles strong, inner bristle of lower row slightly below the )uter and equally distant from it and from the upper supraantennal; mpraantennals unequal, the lower pair scarcely half as large as he upper; the upper supraantennals equally distant with the inner )ristles of the middle row, the lower more approximated. Antennæ )f ordinary size, black, arista almost bare. Palpi more or less lusky to nearly blackish, of ordinary size and armature. Thorax 3lack, very slightly shining; mesopleura bare. Scutellum with two 3ristles. Abdomen black, distinctly greyish tinged. Hypopygium small, greyish, only with short hairs; ventral plate indistinguish- ible ; anal tube small, brownish or dusky yellow with a yellow ipex. Legs blackish or blackish brown ; hind femora with some jparse longish hairs below on the basal part; hind tibiæ with dis- :inct but small bristles. Wings nearly clear or very slightly yel- owish, veins brown to blackish brown : costa 0,36 of Ihe wing-length, :ostal divisions proportionately about as 11 — 3^ s— 3; costal cilia iong but not specially long; fourth vein evenly curved especially at both ends. Halteres yellow. Length 1,4 — 1,? mm. Holte ^Ve— ^-/8 1918 (Th. Mortensen) ; a number of specimens, all males. 34. A. laeta n. sp. c^ A species near the foregoing but with yellow legs and quite another shape of the hypopygium. Male. Frons considerably broader than long, greyish; bristles strong, inner bristle of lower row slightly below the outer and slightly nearer to it than to the upper supraantennal; supraanten- . .