Aphiochaeta. 365 



yellow ventral plate, reaching to the end of the hypopygium; anal 

 tube small, but high, dusky yellow or brown. Legs brown or blackish 

 brown, the front legs slightly paler; hind femora with medium long 

 hairs below the basal half; bristles on hind tibiæ small, hair-Iike and 

 numerous. Wings brown tinged, veins brown or dark brown, thin 

 veins somewhat strong; costa reaching beyond the middle, 1 longer 

 than 2, but shorter than 2+3; costal cilia long, almost very long; 

 fourth vein well curved in its first part, for the rest slightly curved 

 or nearly straight; it issnes more or less behind the base of the fork. 

 Halteres dark brown to black. 



Female. Similar to the male; the lower supraantennals relatively 

 smaller; the hairs below hind femora as in the male; wings with the 



Fig. 109. Wing of A. tumida ?. 



costa thickened, but moderately, from a little behind the humeral 

 cross-vein to the end; the fourth vein still more curved in its basal 

 part. 



Length 1,3 — 2,3 mm. 



Remarks: This species is in the female easily distinguished, and 

 I have compared it with specimens from Wood, but the male will be 

 difficult to distinguish from a couple of the following species. The 

 male I have described is sure, as I have taken it in copula with the 

 female, and it is the Phorid I have taken most often in copula. I am 

 not sure that my male is identical with Wood's, as in his species 1 

 is equal to 2 + 3 as he says in the description, or even longer, as in 

 his specimens I have seen. Wood's remarks about the unusually 

 blunt or truncated appearance of abdomen in the male I am not able 

 to understand, my males, as well as the males from Wood show the 

 end of abdomen and the hypopygium of rather common shape. 



A. tumida is very common in Denmark in suitable localities 

 which are shaded and humid piaces in woods where it occurs on 

 leaves of bushes and in low herbage; I have sometimes seen it swarming 



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