SUCKING INSECTS. 



201 



(Ciilicidm) are confounded under the common 

 names of gnat and musquito, as if there were only 

 one or two species ; whereas Mr Stephens has 

 enumerated twenty-two species of the genera Culex 

 and Anopheles, found in Britain alone -* and hence 

 it is probable, the foreign mosquitoes are also of 

 several species, though to common observers they 

 do not appear to differ from the common gnat 

 {Culex pipiens). 



Sucker of the cleg (Hamatopota pluviuUs) : a, cleg:, natural size; 6, part 

 of the head magnified ; c, magnified still more, showing the facetted eye, 

 the short antennae, and the sucker unsheathed 5 d, the lancets, ^c, of the 

 sucker, separated to show their structure. 



* Catalogue, ii, p. 232, 233; and Zool. Journ. i, 452, iii, 500. 



