170 U. S. NATIONAL MUSEUM BULLETIN 216 



the Gaspe Peninsula, U N. D. des Laurentides," Nominingue, Norway 

 Bay, Pointe a la Croix on the Gaspe Peninsula, Quebec City, St. 

 Bernart at Packington, Sainte Agathe des Monts, Stoneham, Sweets- 

 burg, Valley Junction, Wakefield, and Wright); Rhode Island 

 (Westerly); Saskatchewan (Cypress Hills and Waskesiu Lake); 

 Vermont (Laurel Lake near Jacksonville and Rutland); Virginia 

 (Chain Bridge near McLean); Washington (Colville, Hoquiam, 

 Mount Rainier at 5,000 ft., Seattle, Seaview, and Westport); Wis- 

 consin (Gordon, Madison, and Milwaukee); Wyoming (Riverside in 

 Yellowstone Park); and Yukon (Dawson). 



Most of the collection dates are in June, July, and August but a 

 moderate number are as early as May 25 or late as September 20. A 

 few records are even earlier or later, as follows: May 8 at Akron, 

 Ohio; May 9 at Pescadero, Calif.; May 13 at Ottawa, Ont.; May 16 at 

 New Cumberland, Pa.; May 17, 21, and 24 at Ithaca, N. Y.; May 21 

 at Pine City, Minn, and at Jaffrey, N. H.; September 25 at McLean, 

 N. Y., at Aylmer, Que., and at Cross Point, Que.; September 26 at 

 Pittsburgh, Pa.; October 6 at Inverness, Calif.; and October 27 at 

 Mayo, Md. We have found the species frequently common in northern 

 deciduous woods. 



Rearing records are as follows: 1 rearing from Choristoneura rosac- 

 eana, 1 from Ctenucha virginica, 2 from Halisidota, 7 from Hem- 

 erocampa leucostigma, 2 from H. vetusta, 6 from Hemerocampa sp., 2 

 from Malacosoma disstria, 2 from Malacosoma sp., 1 from Simyra 

 henrici, 1 from pine tussock, 1 from pupa on white thorn, and 1 from 

 cocoon on apple tree. 



This subspecies is transcontinental in the Canadian and Transition 

 zones. Adults occur from late spring to early fall. It is a gregarious 

 parasite of moderately large moth cocoons in exposed situations. 



2. Iscropus californiensis Cushman 

 Figures 321,k; 362 



Iseropus californiensis (as /. californicus in key) Cushman, 1940, Proc. Ent. Soc. 

 Washington, vol. 42, p. 58; o", 9 • Type: 9 , Yosemite, Calif. (Washington). 



Front wing 5.6 to 7.8 mm. long; punctures on face fine; temple 

 unusually full and convex; propodeum rather broad, strongly convex 

 in profile, sublaterally with very few punctures, dorsolaterally sharply 

 rounded but without a distinct ridge; second recurrent at or very near 

 middle of areolet; break of nervellus averaging higher than in the other 

 Nearctic species; male clasper with a short apical point, not con- 

 spicuously projecting, very similar to the clasper of /. stercorator. 



Male: Black. Central 0.6 of face, clypeus, palpi, tegula, and front 

 coxa and trochanters, white; hind corner of pronotum narrowly white 

 or stramineous; front and middle femora fulvous, whitish at the apex; 



