1911 ENTOMOLOGICAL SOCIETY. 75 



Parasite. Host. 



Aphelinus diaspidis Aulacaspis rosae. 



Aphelinus fuscipennis Aspidiotus perniciosus. 



Coccophagus lecanii Pulvinaria innumerabilis. 



Eulecanium cerasifex. 



Eulecanium fletcheri. 

 Coccophagus cognatus Eulecanium fletcheri. 



Coccus hesperidum. 



Eulecanium cerasifex. 

 Coccophagus fiavoscutellum Pulvinaria innumerabilis. 



Eulecanium cerasifex. 



Coccophagus fletcheri Eulecanium fletcheri. 



Ablerus clisiocampae Chionaspis f urf urus. 



Physcus varicornis Chionaspis pinifolisei 



Host Eelations of the Species of Ekcyrtin.i^ PiEared During the Past 

 Summer in the Vicinity of Guelph. 



Parasite. Host. 



Oomys fusca Eulecanium cerasifex. 



Comys bicolor Eulecanium fletcheri. 



Comys scutellata Eulecanium caryse. 



Chiloneurus albicornis Eulecanium fletcheri. 



Eulecanium cerasifex. 



Eulecanium caryae. 



Aphycus jarvisi Eulecanium fletcheri. 



Aphycus pulchellus Kermes pubescens. 



Aphycus pulvinarise Eulecanium fletcheri. 



Eulecanium cerasifex. 



Aphycus johnsoni Eulecanium cerasifex. 



Aphycus flaviceps Eulecanium cerasifex. 



Blastothrix longipennis Eulecanium cerasifex. 



Eulecanium fletcheri. 



Kermes pubescens 

 Encyrtus cyanocephalus Eulecanium caryas. 



Eulecanium cerasifex. 



Encyrtus flavus Eulecanium fletcheri. 



Encyrtus sp Eulecanium fletcheri. 



Encyrtus sp Kermes pubescens. 



In the Coleoptera the Coccinellids are most conspicuous in combatting the 

 more injurious species of scale insects. A small species known as Hyperaspis 

 signatus in the larval stage has been found feeding upon the Curtis Scale at Guelph, 

 Toronto, Grimsby and St. Catharines. In Toronto the same species was found 

 in large numbers feeding upon the Forbes scale on a Hawthorn tree. The larva 

 has also been found at Guelph feeding upon Aspidiotus cesculi and the New York 

 Plum Scale. They probably do their most effective work upo:-" the Cottony Maple 

 Scale as it is estimated that they devour about eighty per cent, of the total scales 

 produced in a season. Other species of Coccinellidge are also beneficial in destroying 

 ;i number of rlifferent scales. Two of the most common species arc Chilocorus 

 hivulnerns and Seymus punctatus. 



