444 



THE ENTOMOLOGIST. 



are few, generally live unmolested ; the autumn generation, 

 when the Braconids are young, seldom escape the latter. 

 The Braconids are tiius adapted in the scheme of Nature to 

 regulate the number of the little Muscids, and to adapt them 

 for their periodical work, a remnant of them being sufficient 

 for recommencement in the spring of each year. The large 

 destruction of the Muscids must be followed by the like event 

 to the destroyers, and investigation is required as to how a 

 very small number of the latter are preserved through the 

 winter. Three species have been lately added by Dr. Giraud 

 to the genus Eupelmus here mentioned, — E. Cicada3, E. splen- 

 dens, and E. bifasciatus : the first is parasitic on the eggs of 

 a Cicada ; the second is parasitic on Bathyaspis Aceris, one 

 of the Cynipidae ; and the third seems to be closely allied to 

 E. pezomachoides. 



The first of the three following figures illustrates the 



EUPLECTU3 ALBIVENTEIS. 



Elachistidac, of which one species, Olynx Gallarum (Ichneu- 

 mon Gallarum, Linn), is familiar to all persons who have 

 examined oak-apples, though there is as yet no exact know- 

 ledge as to the proceedings of the Olynx with regard to the 



