1.8 
resemble tiny " Indian clubs " in shape, and are deposited on the sur- 
face of the water, arranged vertically in compact masses, or " rafts," 
each containing from 200 to 300 eggs. The eggs of the species of 
AnopJieles, on the other hand, are boat-shaped, and are not attached to 
one another, but float freely on the surface of the water in clusters of 
from two or three to as many as 100. The larvae of the Culicinae are 
distinguished by the possession of a posterior dorsal breathing tube, 
or respiratory siphon, which is absent in the Anophelinae. When 
taking in air, the former suspend themselves at an angle from the 
surface film by the extremity of the respiratory siphon, but the 
larvae of the latter lie perfectly horizontal. The food of mosquito 
larvae consists of algae and minute organisms, both animal and 
vegetable ; in captivity they sometimes display cannibal propensities. 
In addition to the species illustrated in the plates, the following 
blood-sucking mosquitoes are also found in the British Islands : — 
Culex morsitans, Theob., lateralis, Mg., ornatus, Mg., diversus, 
Theob., nigripes, Ztt. var. sylvce, Theob., nigritulus, Ztt, lutescens, 
Fabr. ; Grabhamia pidchripalpis, Rond. ; and Tceniorhynchns 
richardii, Fic. 
Genus 
ANOPHELES, Meigen. 
Anopheles nigripes, Staeg. 
Plate 2. 
Specimens of this species in the Museum collection are from 
various localities between and including Colwyn Bay, Carnarvonshire, 
N. Wales, and Penzance, Cornwall : the species is on the wing from 
June to September. According to Theobald (' Monograph of the 
Culicidae,' Vol. I., p. 202) it also occurs in Scotland, and what appears 
to be A. nigripes was recorded (without a specific name) from the North 
of Ireland by A. H. Haliday in 1828 (' Zool. Journal,' III., 1828, p. 501). 
Theobald (Joe. cit.) writes of this species : — " It bites very viciously, 
