DURHAM DIPTERA. 47 



V.69. 



I have seen in numbers. The females swarmed 

 at Hesleden, April, 1901, and are generally too 

 abundant. Prof. Miall gives a most interesting 

 account of their life history in his " Aquatic 

 Insects." 



8 (1). Thorax black or dark grey. 



398. Simulium latipes, Mg. 

 Bishop Auckland, 1 $, November, 1900; 1 5, May, 

 1902. 



Family VI.— CHIRONOMID^E. 

 I have not paid much attention to this very large and 

 difficult Family. I give the following tables containing a 

 large number of the British species, extracted chiefly from 

 Schiner and Zetterstedt, in the hope that it may prove help- 

 ful to some beginner. Some of my identifications of local 

 species are only approximate, but they are as near as I can 

 come at present. The larvae live in water, some in earth or 

 dung. 



TABLE OF GENERA. 



1 (2). Wings club-shaped, very narrow at the base, and 



gradually widening. Very small, 1 mm., black 



species. 70. Corynoneura, Winn. 



(400. minuta, Winn.) 



2 (1). Wings not club-shaped, the anal or hind basal angle 



of the wing being well developed, and often almost 

 a right angle. 



3 (4). Proboscis and palpi rudimentary. 



81. Clunio, Hal. 

 532. Clunio marinus, Hal. 

 The $'s were common on rock pools at Beadnell, 

 Northumberland, in June, 1905. 



4 (3). Proboscis distinctly present, palpi four-jointed. 



5 (24). Dorsum, viewed sideways, much arched, and usually 



overhanging in front; legs long and thin, especially 

 the fore legs ; V.3. never forked ; the long-haired 

 male antennae plume-shaped (II. 10). 



