Aphiochaeta. 293 



dark yellowish. Legs brown or dark brown, front legs paler, especially 

 tibiæ and tarsi yellowish ; the front tarsi thickened as in the preceding 

 species; hind femora with short hairs below; bristles on hind tibiæ 

 distinct, not short, but fine. Wings clear and colourless or nearly so, 

 veins brown; costa reaching to the middle of the wing or about, 1 

 not fully double 2, about equal to 2+3; costal cilia long; fourth 

 vein a little curved in the basal part, for the rest very slightly curved. 

 Halteres black. 



Female. Similar to the male; the four last joints on front tarsi 

 perhaps a little less dilated. 



Length. Nearly 2 mm. 



Of this species I possess only two males and a female; Holte 

 ^Ve 1919 (Th. Mortensen), and in Jutland at Hejls south of Kolding 

 -77 1919 and at Jelhng ^V-, 1921 (the author). 



Geographical distribution: — Denmark and Holland. 



I think my determination of this species is correct; I have seen 

 a type from Pater Schmitz, and I find that I have noted it to be 

 identical with my species, but I must confess that at that time I had 

 not sufficiently studied these difficult species. 



Remarks: The four species Dahli, hyalipennis, alticolella and 

 iinicolor are rather similar; the male of Dahli is at once recognized 

 by the fringe below hind femora and the strongly bristled hypopy- 

 gium, and both sexes are characterised by the long costa and the 

 female also has some longish hairs below the middle of hind femora 

 (often difficult to detect), and front tarsi somewhat dusky; hyali- 

 pennis is characterised' by the black or blackish front tarsi; alticolella 

 and Iinicolor are the two most similar, but may be distinguished from 

 each other by the more tinged wings in alticolella and the males by 

 the long hairs on sixth segment in alticolella and the different hypo- 

 pygium. 



51. A. intercostata Lundbk. 

 1921. Lundbk. Vidensk. Meddel, fra Dansk naturh. Foren. 72, 133, 4. 



Male. Frons broader than high, black and dull, very slightly 

 greyish; inner bristle of lower row below the outer and nearer to it 

 than to the upper supraantennal, supraantennal bristles not quite 

 equal, the lower a little weaker than the upper; the upper supra- 

 antennals approximate, nearer together than the inner bristles of 

 middle row and the lower slightly more approximate. Antennæ small, 



