162 U. S. NATIONAL MUSEUM BULLETIN 216 



July 12, 1955 (MacDonald). cf, reared from Choristoneura fumi- 

 ferana, Ritchie Brook, N. B., July 23, 1955, D. R. Macdonald 

 (Ottawa). 9, "Thorn," N. B., Aug. 14, 1915, A. B. Baird (Ottawa). 

 2 c?, reared from overwintering foliage of Abies, Tobique, N. B., 

 April 1955, D. R. Macdonald (Ottawa). d\ reared from over- 

 wintering foliage of Abies, Upsalquitch, N. B., April 1955, D. R. 

 Macdonald (Ottawa). 9, Bigelow Lawn, Mount Washington at 

 5,400 ft., N. H., Aug. 8, 1954, Becker, Monroe, and Mason (Ottawa). 

 cT, reared from Choristoneura fumiferana, Saranac Lake, N. Y., 

 Mar. 31, 1948 (Washington). 79 (2 of these labeled "flying about 

 Picea"), Bells Corners, Ont., June 24 and 25, 1935 and Aug. 2, 1941, 

 G. S. Walley (Ottawa). 9, reared from Choristoneura fumiferana, 

 Hurkett, Ont., July 22, 1947 (Ottawa). 9, reared from Choristoneura 

 fumiferana, Mobert, Ont., July 21, 1948 (Ottawa), c?, reared from 

 Glypta fumiferanae, Searchmont, Ont., Feb. 20, 1944, W. R. Brown 

 (Ottawa). 9, "Twp. 30," Ont., Aug. 19, 1943 (Ottawa). 9, Forest- 

 ville, Que., Aug. 11, 1950, R. de Ruette (Ottawa). 29, Laniel, Que., 

 June 24, 1944 and July 4, 1944, A. R. Brooks (Ottawa). 9, Rupert 

 House, Que., July 19, 1949, D. P. Gray (Ottawa). 9, Wakefield, 

 Que., June 21, 1946, G. S. Walley (Ottawa). 9, Bechler River, 

 Yellowstone, Wyo., July 27, 1929, R. E. Balch (Washington). 9, 

 reared from Choristoneura fumiferana, collected July 16, 1953, emerged 

 July 18, 1953 (Ottawa). 



Considering the host records cited and the results of the more 

 careful rearing work, it seems likely that this species is never a 

 primary parasite of Choristoneura fumiferana but a secondary, with 

 Glypta fumiferanae as its primary host. 



This species is transcontinental in the Canadian zone. It has 

 been collected as an adult from June 21 to August 19. Its host is 

 Glypta fumiferanae . 



2. Acropimpla alboricta (Cresson), new combination 



Figures 321,i; 331, a; 360 



Pimpla alboricta Cresson, 1870, Trans. Amer. Ent. Soc, vol. 3, p. 147; d\ Lecto- 



type: cf, Delaware (Philadelphia). 

 Pimpla investigatrix Walsh, 1873, Trans. Acad. Sci. St. Louis, vol. 3, p. 142; ? . 



Types: 3$ , ?Illinois (destroyed in Chicago fire of 1871). 



Front wing 3.7 to 8.3 mm. long. The subgenital plate is large 

 and entirely sclerotized. Other specific structural characters are 

 illustrated in the figure of the whole insect or described in the key. 



Male. Black. Clypeus, mandible except at base and apex, palpi, 

 under half of scape and pedicel, hind corner of pronotum, tegula, 

 front and middle coxae and tibiae, and all trochanters, white; flagellum 

 brown beneath; front and middle femora fulvous, their apex whitish; 



