Insects^ etc., Injurious to the Gooseberry. 271 



This fourth brood is unusual, but three frequently occur. Al- 

 though these generations are quite distinct they generally overlap) 

 one another. The number of generations appears to depend on the 

 weather. When it turns cold and wet, not only is development 

 arrested but the larva3 are actually destroyed ; in warm fine weather 

 they, on the other hand, develop rapidly. 



Natueal Enemies. 



There are quite a numl)er of parasites recorded on this insect, 

 but on no occasion have I been fortunate in observing any one of 

 them. 



Cameron (5) records the following parasites : Cliptes nifidicla^ F. ; 

 Omalus armalus, Dlmi. ; lAmncria argcntata, Gr. ; Mesolcius mclano- 



[F. Edenden. 



FIG. ISO.— MALE AND FEMALi: GOOSEBERRY SAWFLIES. 



(Natural size and magiiifled.) 



Uncus, Gr. ; M. armillatorius, Gr. ; 3Iesochoru>i confusus, Hmgr. ; M. 

 grossidaricc, Etz. ; Tryplion ambiguus, Gr. ; T. hi^yimdatus, Gr. ; T. 

 cephcdotes, Gr. ; T. comjyressiis, Etz.; Ctcniscus frigidus ; Ferdi>;.'ii'x 

 limitaris, Gr. ; Folysjihinda rihcsii, Etz. ; Pjigostolus stridicus, Fait. ; 

 and Degccria jiavicans, Gour., in Europe. 



Dr. Asa Fitch (6) has bred in America a Chalcid fly, the Triclio- 

 grariima pretiosa of Eiley, from the eggs of this Nematus, as well 

 as from the ova of Aleyrodes and from those of a Noctuid moth. 



The parasitised eggs of the sawfly become brown and abnormal 

 n shape. The female Chalcid takes two and a half minutes to lay 



