44 THE CANADIAN ENTOMOLOGIST. 



Chakidiae and the Cynips tribe, and though they are now fixed with the 

 Chakidiae, there is still matter for argument as to their maintenance by 

 animal life, or by vegetable life, or as to how they are divided between 

 these two means of existence. Nees mentions his discovery of a gall- 

 making Eurytoma, and Girand announces his ascertaining the vegetable 

 food of Isosoma, a fact afterwards observed by Moncreaff, but this genus 

 has more importance in the U. States, where Harris, Fitch and others have 

 been witnesses of its ravages on corn. But the most interesting ' part of 

 its history is in Canada where a species occurs in grape seeds, and is 

 remarkable not only on account of the singularity of its abode, but also by 

 the contrariety of the sexes, one of them representing the carnivorous 

 Eurytoma, and the other the herbivorous Isosoma, and thus one species 

 figuratively combines the diminishers of vegetation and the controllers of 

 such diminution. Isosoma is destitute of the metallic hue which is the 

 especial ornament of its tribe, but possesses a compact and elegant form, 

 a finely sculptured thorax, and a highly polished abdomen. It occurs in 

 Australia, in Amurland, and probably in all the chief parts of the 

 earth. 



Pteromalus. — This genus is the last of the Canadian Chakidiae, and. 

 thereby indicates what a multitude of discoveries in this tribe are yet to- 

 be made in Canada. It inhabits all parts of the earth, and the British 

 species are exceedingly numerous. P. puparum is the type of the genus 

 and has been long known in Europe. The chrysalis of a butterfly affords 

 food and lodging for its young ; it was found formerly near Hudson's Bay, 

 and its appearance in the U. States has been lately a source of gratifica- 

 tion, and it can hardly fail of being shortly recognized in Canada, having 

 now the means of making itself known. 



MICRO - LEPIDOPTERA. 



BY V. T. CHAMBERS, COVINGTON, KENTUCKY. 

 Continued from Vol. 5, Pagel5. 



G. eupatoriella. Ante p. g. Vol. 4. 



The former notice of this species was very brief and imperfect, having, 

 as there stated, been made from a single specimen which had been untimely 

 nipped from its pupa case. Since then I have bred and captured other 

 specimens. It may be G. Vemistella Clem., Proc. Acad. Nat. Sa., i860. 



