152 



Oithorrhapha brachycera. 



lamellæ shining. Legs black or blackish; coxæ greyish 

 pruinose; the knees somewhat broadly yellow. Femora 

 short-haired , the hairs slightly longer above on the front 

 and hind femora; middle femora with sonie few bristles 

 basally on the anterior side; front tibiæ short-haired, only 

 with a pair of small bristles at the apex; hind tibiæ only 

 with a row of small bristles on the dorsal side and with 

 fine hairs on the ventral side. Front metatarsi somewhat 

 thicker than the end of the tibiæ, about two thirds of the 

 tibiæ in length, and as long as the four following joints 

 together; they are short-haired. All the hairs more or less 

 dark brown. The fourth joint on the anterior tarsi is as 



Fig. 50. H. broad as long, the other joints longer. Wings hyaline. 



front leo'' ^eins black; the upper branch of the cubital vein diverging; 



X 30. the discai cell exceptionally long, its upper margin longer 



than the upper of the veins issuing from it. Stigma long, blackish. 



Balteres black. 



Fig. 51. Wing of H. discoidalis. 



Female. Similar to the male; front metatarsi simple, not qulte 

 half as long as tibiæ, and shorter than the four following joints; hind 

 tibiæ evenly but considerably thickened in somewhat more than the 

 apical half; they are not compressed but very slightly curved. 



Length 2,8 to fully 3,5 mm. 



This species is distinguished from comicula by the very short, 

 quite quadriserial acrostichal bristles, and from coracula by the same 

 character and the hyaline wings; it resembles dypeata by the short 

 thoracic bristles, but the latter species has biserial acrostichal bristles; 

 the most distinguishing character is the length of the discai cell, this 

 being longer than in any other species known to me, except minuta. 



H. discoidalis seems very rare in Denmark; it was first taken in 

 this year (1910), and only three specimens, a male and two females, 

 on a humid meadow at Hald near V^iborg in Jutland, on 2\/fi and ^^/e 

 (the author). 



Geographical distribution : — The species is only known from Denmark. 



