THE ENTOMOLOGIST. 



25)9 



annulled. The parasitism of Seladerma Capreae was observed 

 by Linnaeus, and is mentioned in the Ann. Nat. Hist. 2nd 

 Ser. ii. 218. A woody gall on the willow sometimes produces 

 a Cecidomyia, more often S. Caprea?, and still more often a 

 Plalygasler. Whether the second and third species interfere 

 with each other, or merely with the first, has not been ascer- 

 tained. A Calliniome, that lives in a gall on the leaf of the 

 willow, was probably also specified by Linnaeus as Cynips 

 capreaj. The habits of Systasis are unknown : it belongs, 



SYSTASIS ENCYETOIDES. 



like the two other genera, to the Hormoceridae. I will con- 

 clude with the names of three Chalcids, whose ways of life 

 were described long ago. 



Cynips Gallarum, Lin. The description of this species is 

 too short to apply the name with certainty, but it seems to 

 have a general agreement with Pteromalus doraesticus ; and 

 the substitution of Gallarum for Domesticus may soon be 

 adopted as an amendment in nomenclature. The species 

 described as Pt. domesticus must be generally well known, as 

 it may frequently be seen on windows, and about the holes 

 made in wood by other insects, and immense swarms of it 

 sometimes occur in the neighbourhood of oak-trees, where it 

 limits the multiplication of the little green oak moth, Tortrix 

 viridana. 



Ichneumon colon, Linn. This was known as Ich. quad- 

 rum, Fabr., till A. H. Haliday identified it with the earlier 

 name of Linnaeus ; and Cynips tripunctata, Foiirc, is another 

 synonym of it. It has since been named Cheiropachysquadrura, 



