ICHNEUMON-FLIES OF AMERICA: 1. METOPIENAE 219 



Pennsylvania; Prince Edward Island (Brackley Beach in Canadian 

 National Park and Dalvay House in Canadian National Park); 

 Quebec (Aylmer, Brome, Cascapedia River, Cross Point, Hemming- 

 ford, Hull, Kazubazua, Magog, Montreal, St. Esprit, Ste. Agathe des 

 Montes, Stoneham, and Wright) ; Vermont (Laurel Lake near Jack- 

 sonville and Woodstock); Virginia (Galax); Washington (Ashford, 

 Mount Rainier at 4,700 ft., and Summerland Trail on Mount Rainier) ; 

 and Wisconsin (Door Co. and Madison). 



Dates of collection show that adults occur through the growing 

 season, with greatest abundance in July and August. Particularly 

 early and late dates of capture are: April 17 at Bethpage, Long Island, 

 N. Y.; May 9 and 17 at Ithaca, N. Y.; May 15 at South Hadley 

 Mass.; May 16 in Mecosta Co., Mich.; May 23 in Pine Co., Minn.; 

 May 24 at Houser Lake, Idaho; May 25 at Hull, Que., and at Magog, 

 Que.; May 26 at Robson, B. C. and at McLean Bogs Reserve in 

 Tompkins Co., N. Y. ; September 18 and October 2 in Midland Co., 

 Mich.; September 25 at McLean Bogs Reserve in Tompkins Co., 

 N. Y., and at Cross Point, Que.; October 1 at Madison, Wis.; and 

 October 17 and 18 at Chilliwack, B. C. 



There are many records of rearings from Choristoneura fumiferana 

 on the pin labels of these specimens from localities across the con- 

 tinent. It is noteworthy that all dates of emergence from these 

 rearings are between June 20 and August 9, with most of them in 

 July. This is probably the result of the seasonal life history of this 

 particular host. The localities recorded for these rearings are in 

 British Columbia (Duncan, Esquimalt, and Green River); Maine 

 (Ashland, Coburn Gore, Millinocket, Mount Chase near Patten, 

 Rangeley, Rockwood, Smyrna Mills, St. Agathe, Seboomook area, 

 Shin Pond, Sinclair, and The Forks) ; Minnesota (Isabella) ; and Oregon 

 (Cottage Grove and Sodaville). There are two additional rearings 

 from another host: cf\ from Archips rosana, St. Peters, N. S., July 

 22, 1930, M. L. Prebble; and 9, from Archips rosana, Baddeck, N. S., 

 July 24, 1936, J. McDunnough. 



We have notes from one day's collecting that captured specimens of 

 this species failed to give off the strong odor typical of the genus 

 Exochus. More observations are needed before it could be stated 

 that the species always lacks this odor. 



This subspecies is transcontinental in the Canadian and Transition 

 zones. It is a common parasite of Choristoneura fumiferana. Adults 

 occur throughout the warmer part of the season. 



24c. Exochus nigripalpis subobscurus, new subspecies 



Front wing 3.2 to 5.7 mm. long. 



Black. Interantennal process entirely black or narrowly bordered 



