When the genus Pulex was illustrated, we assigned to it a 

 new station, considering that it was allied to Culex, not only 

 in its mode of subsistence, but as might be expected from that 

 circumstance in the form of the trophi. This opinion we still 

 entertain ; for the differences of structure that we find are only 

 such as might be expected to entitle it to form a distinct order, 

 and the differences in the structure of the mouth are less than 

 we meet with in many dipterous genera ; for example, between 

 the Culicidae and Tipulidae, the family in which it was till 

 lately included, (vide Limiiobia, pi. 50.) and still greater com- 

 pared with the CEstridse. We must content ourselves by re- 

 ferring to the dissections of Pulex, first observing that the- 

 tongue of the Culicidee has never before been represented in 

 any figure, and that the maxilla, from their extreme delicacy, 

 having broken in extricating them from the labium, their exact 

 length may not be quite correct, but they appeared to resemble 

 the mandibles ; and it may be remarked that the same perfec- 

 tion of organs and uniformity in their length are observable 

 in the mouths of the sanguinary Tabani. 



Anopheles has been separated from Culex, and is distin- 

 guished by the palpi of the males being shorter, and of the 

 females very much longer, than in the latter genus. Anopheles 

 .embraces only two described species, both of which are na- 

 tives of Britain. 



1. A. bifurcatus Linn., Nob. — Wings immaculate. 



This insect, which 1 have frequently taken upon my windows 

 at Lisson Grove, is found from the middle of June to the 

 same period of July ; and Mr. Haliday, who has met with it 

 in Ireland, says, " the males hover in small flights about the 

 skirts of groves near rivulets in the still evenings of June : 

 during the day among brambles in shady ditches and swamps: 

 the females are rare, and generally solitary." Linnaeus says, 

 the larvae live in water, and that the flies do not bite or wound 

 as the gnat does. 



2. A. raaculipennis Hoff.—Meig. 1. 11. 2. tab. 1./. 17.— 

 bifurcatus Meig., Klass. — Wings with five fuscous spots on 

 each. 



Occurs in May in the neighbourhood of London; and the 

 beginning of September I observed a few at Niton in the Isle 

 of Wight. Mr. Haliday says, " these also fly in small swarms 

 in the evenings of June, when I have taken them paired in 

 the air ; they are however much more abundant in dark out- 

 houses and about sewers from May to September. They are 

 very much infested by a small reddish parasite (Ocypete 

 rubra ?) ; I have found ten of these attached to the abdomen 

 of a male." 



Agariais plicaiiljs Curtis, accompanies the insects. 



