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U. S. NATIONAL MUSEUM BULLETIN 216 



Figures 185, 186. 



-Localities: 185 (left), Megarhyssa nortoni nortoni; 186 (right), 

 M. n. quebecensis. 



Field Brook, Calif.; September 1 at Sugar Lake, B. C; September 4 

 at Kelly, Calif.; September 7 at Glen Alpine Creek, Lake Tahoe, 

 Calif.; September 16 on Gabriola Island, B. C; and "Sept." at Maple 

 Bay, B. C. We have found the species often common in forests of 

 Pseudotsuga taxifolia, on or around logs or stumps of this tree. 



There are many records of rearings from wood or occurrence of 

 specimens on certain kinds of trees or stumps, but the only suggestion 

 of an actual host association is on the pin label of a female labeled: 

 "Chrysobothris, Corvallis, Oreg., Apr. 9, 1916, W. J. Chamberlin." 

 The tree species with which the pin labels associate specimens are: 

 Abies concolor, A. grandis, A. lasiocarpa, A. magnified, Picea sitchensis, 

 Pinus contorta murrayana, P. jejjreyi, P. ponderosa, Pseudotsuga 

 taxifolia, and "cedar." 



This subspecies occurs in the West, except that occasional specimens 

 from the East appear to be assignable to it. It is in coniferous forests 

 in the Canadian and Transition zones. Most adults occur from about 

 June 12 to August 30. Its hosts, as reported in literature, are several 

 species of siricids. 



lb. Megarhyssa nortoni quebecensis (Provancher) 



Thalessa Quebecensis Provancher, 1873, Naturaliste Canadien, vol. 3, p. 447; d\ 



9 . Types: d\ 9 , Quebec (lost). 

 Biology: Proctor, 1938, Biological survey of the Mount Desert region, vol. 1, 

 p. 406. 



This is the eastern subspecies. The ground color is light reddish 

 brown, as noted in the key. 

 Specimens (15 cf, 349): From Connecticut (Lyme); Michigan 



