70 
Chrysops, a genus of Tabanidas : C. cceculiens (plate 26), striking sexual 
difference in coloration and marking of abdomen, beauty of eyes, 
British specimens in Museum, 53; in England, commonest species of 
genus, not plentiful in Scotland, 54 ; almost silent in approach, thus 
differing from Tabanus, continental specimens in Museum, 54 ; 
C. quadrata (plate 27), differences between male and female, 54 ; rare 
generally in Britain, continental specimens in Museum, 55 ; C. relicta 
(plate 28), distinguished from C. caaitiens, description of, common and 
generally distributed in Great Britain, continental specimens in Museum, 
55; C. seftulcralis, rare in British islands, only three specimens in 
Museum, description of, continental distribution, 56. 
Clegs, popular name for species of Tabanidae, 31. 
CocciD/E (scale-insects), distinguished from gall-midges (Diptera), 11. 
Culex, a genus of Culicidse : C. cantans (plate 6), not very common in 
Great Britain, 24; C. nemorosns (plate 7), common in England, not seen 
in houses or out-buildings, range of, 25 ; C. pipiens, the Common Gnat, 
(plate 8), common in Great Britain, in houses practically throughout the 
year, 25 ; often found in winter on roofs of cellars, a troublesome blood- 
sucker, geographical range, 26. 
Culicid.e (gnats or mosquitoes), twenty-two British species, how distin- 
guished from certain midges, 1 7 ; blood-sucking habit confined to female 
sex in British mosquitoes, 17 ; preliminary stages of development, 17, 18; 
British mosquitoes beside those illustrated, 18. 
Culicoides, a genus of Chironomidse, revived by Kieffer to include Cerato- 
pogon varhis, C. pitlicaris, and other species of Ceratopogon, 14 (note). 
Dark surfaces, predilection of various blood-sucking Diptera (Anop/ie/es, 
Htzmatopota, Lyperosid) for resting thereon, 60, 61. 
Diptera, chief characteristics of, n ; fifty-nine families recognised as British 
in Verrall's 'List,' n ; 2700-3000 British species, 12. 
Dun-flies, popular name for species of Tabanida;, 31. 
"Flies," meaning of term, 11; blood-sucking habit in only six British 
families, 12. 
Gad-flies, popular name frequently applied to Tabanidae, 31. 
