Aphiochaeta. 381 



Female. Unknown (see under remarks). 



This interesting species is very rare, only one specimen has been 

 taken, Holte ^Vs 1917 (Th. Mortensen). 



Geographical distribution: — Hitherto only known from Den- 

 mark (see under remarks). 



Remarks: Since I first described this species I have been aquainted 

 with A. briinneipennis Costa and I think it probable that the present 

 species is the hitherto unknown male of the said species; they agree 

 rather well, and I think the thickened costa in ruhicunda is strongly 

 in favour of this view. I keep at present my species, as I possess only 

 one male and one rather bad female, and therefore think it well to 

 await new material, but I feel, however, rather sure that we have 

 here the two sexes of brunneipennis. 



123. A. nudiventris Wood. 



1909. Wood, Ent. Month. Mag. 2, XX, 195, 244 (Phora). - 1914. Brues, 

 Bull. Wisc. Nat. Hist. Soc. XII, 12.5. 



Male. Frons broader tlian high, greyish black, dull; inner bristle 

 of lower row in the same height as the outer and nearer to it .than to 

 the upper supraantennal; supraantennal bristles not large, unequal, 

 the lower rather small; the upper supraantennals approximate, not 

 fully as distant as the inner bristles of middle row, the lower a little 

 more approximate. Antennæ not large, brown or blackish brown, 

 arista long, distinctly pubescent. Palpi yellow, of ordinary size, with 

 well developed bristles. Thorax black or with a slight reddish hue, 

 slightly shining, with brownish pubescence. Pleura more or less reddish. 

 Mesopleura bare. Abdomeri somewhat long and slender, black, some- 

 what greyish, dull; the short hairs are distinct, and they are a little 

 longer at the hind margins of the segments; on the last segments 

 the hairs are rather well developed at the sides. Hypopygium large, 

 as long or fully as long as the sixth segment and broader than it, 

 cylindrical ; it is grey or reddish grey, the lower hinder corners slightly 

 produced ; in the middle of each side there is a group of bristles, con- 

 sisting of three bristles below and upwards some smaller bristles or 

 coarse hairs; ventral plate yellow, not large (the triangular point 

 mentioned by Wood I could not see); anal tube small, yellow. Legs 

 yellow, hind femora a little darkened at apex; hairs below hind femora 

 not long; hind tibiæ somewhat thickened towards the end, though 

 not very conspicuously, the bristles numerous and hair-like, but the 



