SUCKING INSECTS. 



201 



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 pip tens). 



Sucker of the cleg^Hcpmatopota pluvialis) : a, cleg, natural size ; b, part 

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

 the short antennae, and the sucker unsheathed; d, the lancets, &c. of the 

 sucker, separated to show their structure. 



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



