SCOTTISH PHORID^E 19 



9. (10.) Hind tibia bare (sometimes one weak bristle may be 

 present about the middle). ritreiformis, Beck. 



10. (9.) Hind tibiae with two bristles on the outer side. 



vitripennis, Mg. 



mordellaria, Flu., seems to be confined to England ; the 

 only specimens I have seen were from the New Forest. 



incrassata, Mg., I have seen this from the north of 

 Scotland and the south of England, but have not met 

 with it myself. 



carinifrons, Ztt, seems to be generally common. I 

 have met with it in abundance at Bonhill, and have 

 seen it from the north of Scotland and also from 

 England. 



femorata, Mg. This seems to be scarce, but generally 

 distributed. Dr. Wood has taken it at Tarrington, 

 Hereford, and has seen it from the north of Scotland. 

 I meet with it occasionally at Bonhill, having a series of 

 about a dozen specimens. 



ritreiformis, Beck., seems to be generally distributed. I 

 generally obtain about half a dozen in a season at 

 Bonhill off Umbelliferae, and Dr. Wood records it from 

 Hereford. 



vitripennis, Mg. I met with this species in abundance 

 on an old moss-grown wall at Bonhill in June 1908. 

 The insects were just emerging, and many were im- 

 mature. Mr. J. E. Collin has bred it from bees' nests. 



The European species of this genus are, besides the above, 

 coronata, Beck., Bernuthi, Egg., and agilis, Mg. The species agilis, 

 Mg., may be more properly referable to Chcetoneura as the second 

 vein is sometimes present. I have not seen any of these three 

 species, but they may be turned up yet in Britain. 



CHvETONEURA, Mall. 



Generic description : Antennae normal ; arista dorsal ; frontal 

 bristles in two horizontal rows of four each ; postantennal bristles 

 reclinate ; palpi normal ; costa to beyond middle of wing, fringed ; 

 third thick vein with short bristles, second vein present ; first thin 

 vein distinctly bent at base ; four thin veins present ; the mid- 

 tibial bristles are three in number, two basal and one sub-apical 

 all sub-equal in size. Type : thoracica, Mg. 



Table of Species. 



1. (2.) Halteres black. curvinervis, Beck. 



2. (i.) Halteres pale (yellow). 



