NATURAL ENEMIES OF THE COCCIDJ]. 31 



sites, all of which have been kindly identified by Dr. 

 L. 0. Howard, of the United States Department of 

 Agriculture. 



Aphycus, sp. This is a pretty little insect, having a 

 bright orange thorax and head, with a dark apodema 

 and a black collar. Several specimens were reared 

 from a species of Lecaninm infesting blackthorn at 

 Wrexham, North Wales, July, 1891. Unfortunately 

 the antenna! flagella were wanting in all my specimens, 

 and all that Dr. Howard could say of them was that 

 the species is probably new, and that it belongs to 

 neither of the two known European species, namely, A. 

 pimctipes, Dalm., and A. hederaceus,Westw. Apparently 

 this species does not actually kill its host, but mate- 

 rially reduces the productive power of the Coccid. 



Bias tot hrix sericea, Dalm. This species is the most 

 widely distributed and the commonest of the British 

 Coccid parasites, but apparently confines its attacks to 

 the indigenous Lecania. It has been reared freely 

 both by Mr. J. W. Douglas and myself from specimens 

 infesting a variety of trees and shrubs. The larvae of 

 this species also feed upon the eggs of the Coccid. 



Ooccophngus, sp. Two specimens only were bred 

 from Lichtensia viburni, taken at Llandaff, and these 

 were unfortunately mutilated, and could not be deter- 

 mined with certainty. As L. viburni is seldom attacked 

 by parasitic insects the species is probably a rare one. 



Encyrtus festucge, Mayr. Infests Eriopeltis festucae, 

 but is not an abundant species, and affects a very small 

 percentage of the Coccids. 



Encyrtus scaurus, Walker, is very abundant at Dela- 

 mere, Cheshire, infesting quite 50 per cent, of Physo- 

 kermes abietis, Geoff. ; but I have not met with it in 

 other localities where this Coccid is also common. It 

 does not materially alter the form of its host, but per- 

 forates the dermis and makes it abnormally thin. 



Encyrtus, sp. This infests the common Rose Scale 

 (Aulacaspis [Diaspis] rosse), causing the female to 

 swell and the skin to become highly chitinised, so that 



