386 Hymenoptera in America North of Mexico 



true host has killed the carrier host and emerged from it. When the true host is an internal lar- 

 val-pupal parasite (a species of Anomaloninae being recorded as a host of Eiiceros frigid is Cres- 

 son) it would be necessary for the Euceros planidium to bore through the integument of the car- 

 rier host in order to reach the true host. There appear to be seven or eight larval instars; during 

 the first four stadia, the Euceros larvae are internal parasites, but during the last three or four 

 stadia they are external parasites. 



Revision: Barron, 1977 (1976). Nat. Canad. 103: 285-375. 



Taxonomy: Perkins, 1959. Handb. Ident. Brit. Ins., v. 7, pt. 2 (ai), p. 14. — Townes, 1969. 

 Amer. Ent. Inst., Mem. 11: 193-194. 



Morphology: Finlayson, 1960. Canad. Ent. 92: 34, 37 (final-instar larva). —Tripp, 1961. Canad. 

 Ent. 93: 41-43, 45-48, 49, 56, 57 (ovariole, egg, first-instar larva, final-instar larva). 

 — Varley, 1965 (1964). Ent. Monthly Mag. 100: 114, 115-116 (first-instar larva). 

 albomarginatus Cushman. N. H., N. Y., Pa., Ohio. 



Sco7-pioms{l) albomarginatus Ashmead, 1902. In Slosson, Ent. News 13: 320. Nomen 



nudum. 

 Euceros albomarginatus Cushman, 1922. U. S. Natl. Mus., Proc. 61 (8): 12. 9. 



angulicornis Walley. B. C. 



Euceros angulicornis Walley, 1932. Canad. Ent. 64: 246. 6,9. 

 canadensis Cresson. Que., N. H., Vt., N. Y., Ont., Ohio, Mich. 



Euceros Canadensis Cresson, 1869. Canad. Ent. 1: 103. 9. 



digitalis Walley. Ont. 



Ettceros digitalis Walley, 1932. Canad. Ent. 64: 242. 6. 

 faciens Davis. Wash., Oreg. Ecology: Reared from a parasite of Neodiprion tsugae Midd. 



Euceros faciens Davis, 1897. Amer. Ent. Soc, Trans. 24: 256. 6. 

 flavescens Cresson. Conn., W. Va. 



Euceros flavescens Cresson, 1869. Canad. Ent. 1: 105. 6,9. 

 frigidus Cresson. Que., Maine, Ont., Man., B. C. Host: Casinaria semiothisae Wly.?, E7idasijs 

 subclavatus (Say), Lamachus sp., Olesicampe lophyri (Riley), sp. of Anomaloninae near 

 Therion, Tryphoninae. 



Euceros frigidus Cresson, 1869. Canad. Ent. 1: 105. 9. 



Biology: Finlayson, 1960. Canad. Ent. 92: 34, 36. -Tripp, 1961. Canad. Ent. 93: 40-58. 

 medialis Cresson. Que. s. to N. C, w. to Alta. 



Euceros medialis Cresson, 1869. Canad. Ent. 1: 105. 9. 

 neodiprioni Walley. Que., Md. Ecology: Reared from a parasite of Neodiprion sp. 



Euceros neodiprioni Walley, 1932. Canad. Ent. 64: 245. 6,9. 



obesus Davis. N. Y., 111. 



Euceros obesus Davis, 1897. Amer. Ent. Soc, Trans. 24: 255. 9. 



sanguineus Davis. Colo. 



Euceros sanguineus Davis, 1897. Amer. Ent. Soc, Trans. 24: 255. 6, 9. 

 thoracicus Cresson. Que., Maine, N. H., Conn., N. Y., Pa., Ont., Man. Ecology: Reared from 

 parasites of Caripeta divisata Wlk., Hydriomena divisaria (Wlk.), Semiothisa 

 "granitata" auct., Neodiprion sp., N. swainei Midd., N. sp. in virginiana complex, and 

 Pristiphora (Htg.). 



Euceros Couperii Cresson, 1869. Canad. Ent. 1: 104. 6. 



Euceros thoracicus Cresson, 1869. Canad. Ent. 1: 105. 6. 



Euceros couperi Dalla Torre, 1901. Cat. Hym., v. 3, p. 326. Emend. 



Scorpiorus(l) flavopictus Ashmead, 1902. In Slosson, Ent. News 13: 6. Nomen nudum. 



Euceros vierecki Hertzog, 1909. Ent. News 20: 245. "d" = 9. 



Euceros decorus Walley, 1932. Canad. Ent. 64: 244. 6,9. 



Subfamily ADELOGNATHINAE 

 Genus ADELOGNATHUS Holmgren 



Adeloffiiathus Holmgren, 1857 (1855). Svenska Vetensk.-Akad. Handl. (n. f.) 1: 196. 



