been very properly restored to its old species, 

 and, as far as I can learn, the name of Scjeva is 

 rejected by Meigen. Consequently, the nine 

 new species which I described in the Journal of 

 the Academy of Natural Sciences (vol. iii. p. 

 88.) under the name of SciEVA, must now be 

 considered as belonging to the genus Syrphus. 

 As it now stands, this genus is closely allied to 

 MiLEsiA. Not one of our numerous species 

 was known to Fabricius. 



The larvae feed on Aphides or Plant-lice ; 

 the body is in the shape of an unequal cone, 

 large behind, attenuated to a point before, and 

 destitute of distinct feet. In order to suck out 

 the juices of their victim, they raise it from the 

 surface of the plant on which they rest. When 

 about to enter the pupa state, they attach them- 

 selves by a glutinous secretion to a fixed object, 

 the body contracts, and the anterior portion, 

 which was previously attenuated, becomes the 

 most dilated part. 



PLATE XI. 



