174 U. S. NATIONAL MUSEUM BULLETIN 216 



Great Falls, Richmond, Rosslyn, and Vienna); West Virginia (Bald- 

 win, Bolivar, Cheat Mt. at 2,000 ft. in Randolph Co., and Lost River 

 State Park in Hardy Co.); and Wisconsin (Corliss, Dane Co., Door 

 Co., Madison, and Sawyer Co.). 



The dates of capture show first emergence of the species late in 

 May over most of its range, increase to a peak in July and August, 

 and decrease into fall, the last survivors disappearing before the 

 middle of October. Unusually early and late captures are: March 

 7 at Mound, La.; April 1 at Tallahassee, Fla.; April 23 in Wake Co., 

 N. C; May 7 and 28 at Washington, D. C; May 8 near Tigerville, 

 S. C; May 13 at McClellanville, S. C; May 23 at Lawrence, Kans.; 

 May 24 at Dix Hills, Long Island, N. Y.; May 29 at Ithaca, N. Y. 

 and at Columbia, S. C; May 30 in Eaton Co., Mich.; October 12 in 

 Wilson Co., N. C; October 11 at Jordan, Ont.; and October 13 at 

 Madison, Wis. 



The host records on the pin labels are : 26 rearings from Hemero- 

 campa leucostigma, 1 from Hemerocampa sp.; 3 from Malacosoma 

 americanum, 1 from M. disstria, 1 from Metallus rubi, 2 from Olene 

 sp., 10 from tussock moth, 1 from slug larva, 1 from pupa under log, 

 1 from cocoons on Malus, 1 from lepidopterous cocoon, and 1 from 

 mud wasp cells. In our own collection we have found the species 

 very common among deciduous woods or isolated trees. 



There are several notes on the biology of this species, and an 

 extensive account by Howard, 1897 (pp. 8-17). Oviposition is on pre- 

 pupae or occasionally on fresh pupae within their cocoons. In summer, 

 adults hatch about 15 days after the egg is laid. Single hosts (Hemer- 

 ocampa leucostigma) mature one to about twenty parasites. Over- 

 wintering is as larvae in their cocoons within the host cocoon. 



This species is in the Alleghanian, Carolinian, and Austroriparian 

 faunas, where it is common among deciduous trees. Adults occur 

 from midspring to midfall. Its hosts are moderately large, flimsy 

 lepidopterous cocoons on tree trunks, usually those of Malacosoma 

 and Hemerocampa. 



10. Genus Tromatobia 



Figuke 290,a 



Tromatobia Foerster, 1868, Verh. Naturh. Ver. Rheinlande, vol. 25, p. 164. 



Type: Pimpla variabilis Holmgren; designated by Viereck, 1914. 

 Austropimpla Brethes, 1913, Anal. Mus. Nac. Hist. Nat. Buenos Aires, vol, 24, 



p. 40. Type: Austropimpla hiibrichi Brethes; original designation. 



Front wing 3.5 to 7.8 mm. long; body moderately long and slender; 

 clypeus of male white or pale yellow; face of male white, black, or 

 concolorous with rest of head; face and clypeus of female variously 

 colored, usually black or blackish, the face marked with white on the 

 sides and the clypeus partly white; frontal orbit marked with white 



