2o6 THE SCOTTISH NATURALIST 



hind femora with two long antero-ventral bristles near the tip ; 

 the other bristling as in the $ ; wings yellower than in 

 the £ . 4 to 5 mm. 



I have never met with this species. 



23. incisurata, Ztt, £ . Very similar in size and appearance to 

 sca/aris, the eyes are more widely separated and the dusting 

 more conspicuous, the abdomen presenting a rather banded 

 appearance; legs black, all knees, especially the fore pair, 

 yellow ; a small bristle besides the preapical one sometimes 

 present on the fore tibia ; mid femora with a row of moderately 

 long bristles (five to six) on the basal half and a regular row of 

 short bristles on the tip half of the antero-ventral surface; 

 postero-ventral row very long and strong at the base but rapidly 

 decreasing in size beyond the middle, and forming a continuous 

 row of short bristles on the tip fifth ; mid tibia very little 

 thickened, the pubescence very short and thick, of almost 

 equal length on the whole tibia, the bristling normal; hind 

 femora with an antero-ventral row of bristles, the last three the 

 longest, postero-ventral row somewhat similar but weaker ; 

 hind tibia with rows of short bristles on the antero-dorsal, 

 antero-ventral, and postero-ventral surfaces, much as in sca/aris ; 

 wings, etc., as in scalaris. 



$ . Stein describes the 9 as similar to that of sca/aris, 

 and gives as distinctions, the absence of the basal ventral 

 bristle from the mid femora, and the possession of a postero- 

 ventral row of weak bristles on the hind femora. I have taken 

 several ? $ along with $ <$ , but am unable to find any 

 without the mid femoral bristle. 



Bonhill, not uncommon ; May to August ; Musselburgh 

 (Carter). 



24. mutica, Ztt. $ . Deep black ; eyes large, narrowly separated ; 

 frons in profile narrowly projecting, jowls hardly descending 

 below the eyes ; antennne of moderate length, third joint rather 

 more than twice the length of the second ; arista bare ; thorax 

 deep black, only distinctly dusted on the sides and behind; 

 abdomen with distinct pale grey dusting, rather short and 

 broad, the dorsal line distinctly triangularly dilated, anal organ 

 small ; legs black ; mid femora with an antero-ventral row of 

 about nine bristles which decrease in length, but increase in 

 strength to the end of the basal two-thirds, followed by a small 

 break and a short row of eleven to twelve fine bristles on the con- 

 stricted part of the femora; postero-ventral bristles long and 



