Phora. 193 



bristle below the base and five to eight dorsal bristles, hind tibiæ 

 with one anterior bristle at the upper third. Wings clear and colourless, 

 thick veins brownish the other veins very pale; costa about to the 

 middle (about 0,48 of the wing-length), 1 longer than 2 (about 17 — 14); 

 costal cilia long; fourth vein slightly curved in its first part, for the 



Fig. 73. Wing of Ph. heterocerca ^. 



rest almost straight; the anal vein very slightly indicated, seventh 

 vein also weak, but reaching the margin. 



Female. Similar to the male with the usual differences; front 

 tarsi distinctly dilated ; middle tibiæ with three to four dorsal bristles ; 

 the hind femora show a quite small process below the base. As in 

 the male the inner bristles of third row are only about half the length 

 of the other bristles. 



Length 2 — 2,5 mm. 



Remarks: It is curious that most of my male specimens show a 

 different number of the dorsal bristles on the middle tibiæ as there 

 is one more bristle on one tibia than on the other, thus five and six, 

 six and seven, and seven and eight; also a female shows the same, 

 viz three and four bristles. Schmitz describes 1. c, a variety with 

 the wings a little tinged, this variety seems to have the front tarsi 

 as a rule slightly more dilated and fewer bristles on middle tibiæ viz 

 four to five, and there seems also to be a little difference in the wing 

 as the costa is a little longer and division 1 relatively shorter; this 

 variety I have not seen from Denmark. My male specimens are deter- 

 mined by Pater Schmitz. 



Ph. heterocerca is rare in Denmark, I possess about twenty spec- 

 imens, males and females, all taken in one locality, in Ermelund in 

 low herbage on ^'^U to ^Vs in 1917 to 1921 (the author); for the genuine 

 form Schmitz also records May so that the species seems to occur in 

 spring. I have taken it in copula on ~^U and ^V's. Only two of my 



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