298 



THE CANADIAN ENTOMOLOGIST. 



Cocoons of L. erichsotiii were collected in the larch section of the 

 forest belt at the Central Experimental Farm, Ottawa, in May, 19 lo, and on 

 May 2ist, a few days after bringing them into the laboratory, 25 specimens 

 of the Chalcid emerged; 22 specimens did not emerge, but were dissected 

 out. A careful examination of the parasite indicated its similarity on the 

 whole, but not entirely, to Packard's figure already mentioned. This was 

 kindly confirmed by Mr. C. T. Brues, of the Bussey Institution of the 

 Harvard University, who placed it in Forster's genus Ccelopisthia. The 

 occurrence of this parasite was discussed with Mr. W. F. Fiske, in charge 

 of the Gipsy Moth Parasite Laboratory, Melrose Highlands, Mass., who 

 also examined cocoons of L. erichsonii collected at Wellesley, Mass., and 

 found the pup?e of this parasite in these cocoons on July 28th. Mr, Fiske 

 arranged for cocoons to be collected for me from the same locality, and 

 these were received on September the 13th. At this time practically all 

 the larvae of Z. erichsonii have gone underneath the turf and have formed 

 cocoons and are thus prepared for hibernation. It was upon this material 

 that most of the following observations were made. 



During my absence from Ottawa for several weeks, Mr. G. E. Sanders 

 kept the records, and he has also drawn up the description of the adult at 

 my request, which assistance I wish to gratefully acknowledge. 



Description of the Adult. 

 CoelGpisthia nematicida Pack, 



Female (Fig. 19). — Length, 1.7 to 2.1 mm. Average length of ten 

 specimens, 1.92 mm. Colour black ; the head and thorax closely and 

 evenly reticulate, slightly hispid, giving strongly metallic dark green reflec- 

 tions ; the abdomen black, smooth and glossy ; antennae non metallic, the 



scape and pedicel brown, theflagellum 

 darker brown ; coxie for the most part 

 black with a green metallic lustre, tips 

 slightly brown ; legs non-metallic pale- 

 brown, femora fuscescent ; wings hya- 

 line, venation pale-brown ; eyes dark, 

 variable somewhat, but usually giving 

 a purplish reflection. 



Head (anterior aspect), broadly 

 oval ; antenni^ inserted on an im- 

 aginary line drawn from base to base 

 of the eyes ; face broadly depressed 

 along scapes ; clypeus twice as wide as long, immarginate, notched in 



4- 



Fig. 19. — Cwlopisthia nematicida Pack, 

 female, x 12. 



