THE CANADIAN ENTOMOLOGIST. 



53 



Nests of the second and third colonies which T took from branches about 

 fourteen feet from the ground, at the end of October, 1868, are infested with 

 a Hymenopterous parasite. One of these species issued from a cell of macu- 

 lata about six days after it was in my possession. Five came from one cell. 

 I sent this Hymenopter to Mr. Cresson, of Philadelphia, and he has since 

 described it as a new species, Eueerox burrus (Canadian Entomologist, i. p. 

 104). This parasite occupied a longitudinal position in the cell of the wasp, 

 and its cocoons were slightly made, and stood side by side. I also remarked 

 that they issued from a cell which was covered with the cap which is generally 

 spun by the wasp larva prior to its changing into a pupa. Therefore I think 

 that E. harms is a wasp pupa parasite. There are at present cocoons of 

 what I take to be another species occupying about two-thirds of the cells of 

 a nest of Yezpa. maculata, but differently shaped from the cocoons of E. 

 burrus, being generally triangular in shape externally, but having an inte- 

 rior cocoon occupied at present with the larva. The curious shaped cocoons, 

 of chestnut color, are all situated at the bottom of the cells, and only in 

 those cells which are open, but having the larval lining to the walls of the 

 cells, and in every instance uncovered. For this reason 1 believe that this 

 parasitic larva, which has now lain in cocoon since October, 1868, and is 

 not yet developed into the perfect insect, is probably a wasp larvre parasite, 

 and they illustrate what entomologists term " the metropolis of a species." 

 When they issue, we may conclude it to be their prolific year. 



LIST OF COLEOPTERA. 



TAKEN AT GRIMSBY, ONTARIO, BY J. PETTIT. 



( Continued from page 18. ) 



GYRINUS, Linn. 

 *Pieipes, Aube. 

 ^'•Ventralis, Kirby. 

 *Analis, Scry. 



Helophorus, Fab. 

 Lacustris, Lee. 

 Lineatus, Say. 

 Scaber, Lee. 



GYRINID.E. 



*Aeneolus, Lee. 

 Fraternus, Coupe.r. 

 *Lugens, Zimm. 

 *Limbatus, S-ry.i- 

 HYDROPHILIDJE. 

 Hydrochus, Germ. 

 Squamifer, Lee. 

 *Excavatus, Lee. 



*S 



implex, Lee. 



Dineutes, McLeay. 



Americanus, Linn. 

 *Carolinus, Lee. 



Hydrjena, Klug. 



;;: Pensylvauica, Kies. 

 JIydropiiilus, Geoff. 



Triangularis, S<iy. 



* Species marked with an asterisk have not before been included in the list of Cana- 

 dian Coleoptera. 



1 From Canada East. 



