Parastenophora. 123 



angle at fork large; costal cilia rather short; third vein somewhat 

 thickened, fourth slightly and evenly curved in its first part. Hal- 

 teres with the peduncle reddish, the knob black or blackish. 



Female. Frons a little less broad than in the male; antennæ 

 slightly smaller with a more pubescent arista. Wings with costa 

 longer, 1 not miich longer than 2; third vein considerably thickened. 

 Halteres with the knob often paler. 



Length 1 to aboiit 2 mm. 



P. unispinosa is not rare in Denmark, Holte, Geel Skov, Suserup 

 Skov at Sorø, Bogø soutli of Sealand, at Lohals on Langeland, and 

 in Jutland at Hejls and Skamling south of Kolding, Jelling and 

 in Hals Sønderskov at the east end of Limfjorden (Th. Mortensen, 

 the author). The dates are ^li — V9; it was for the first time taken in 

 1917. 



Geographical distribution : — Europe down into Aiistria and also 

 recorded from Spain; towards the north to middle Sweden. 



3. P. nudipalpis Beck. 



1901. Beck. Abhandl. zool. bot. Gesell. Wien, I, 29, 17, Taf. I, Fig. 20 

 {Pliora). - 1906. Wood. Ent. Month. Mag. 2, XVII, 193, 265 {Pliora). - 1910. 

 Kertész, Cat. Dipt. VII, 394 {PJwra). — 1914. Brues, Bull. Wisc. Nat. Hist. 

 Soc. XII, 96 (Dohrniphora). — 1918. tSchmitz, Jaarb. Natuiirh. Genootsch. 

 Limburg 1917, 96 {PseudostenopJwra). 



Male. Frons not much broader than high, black, shining; the 

 anterior rows of bristles nearly straight, only the lower a little convex. 

 Antennæ small, blackish or blackish brown; arista pubescent. Palpi 

 black or brown, large, flat and rather broad, they have a long bristle 

 at the end, otherwise they are nearly nude, only with a couple of 

 small bristles. Thorax black, somewhat shining, with brownish 

 pubescence and one pair of dorsocentral bristles. Scutellum with 

 two bristles. Abdomen black, a little greyish, not shining, second and 

 sixth segments a little elongated; abdomen very sparingly with short 

 hairs, not distinctly longer at the hind margin of sixth segment. 

 Hypopygium small, greyish black; it is quite short above, the arms 

 of the forceps elongated, symmetricai; anal tube quite short, black; 

 there is a large yellowish ventral plate, which is arched and rounded 

 or slightly pointed at the end. Legs brown to brownish black, the 

 front legs the palest, and also posterior tibiæ and tarsi paler; front 

 tibiæ with a dorsal bristle above the middle, middle tibiæ with a 

 pair at about the upper fourth and a smaller anterior bristle near 



