334 ^ PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 68. 



mandible; face and vertex subequal in width; eyes sinuate within; 

 lower margin of antennal foramina below middle of eye; antennae 

 very long and slender, slightly attenuate toward apex; frons deeply 

 concave, transversely rugose medially; diameter of lateral ocellus 

 equal to ocellocular line and slightly more than half as long as pos- 

 tocellar line; notauli very broadly, shallowly indicated in front; 

 propodeum transversely rugulose above, reticulate punctate laterally, 

 polished posteriorly, spiracle long oval to broad oval, depending on 

 size and sex; scutellum weakly convex, subtruncate at apex; nervu- 

 lus postfurcal. 



In the male the clypeus is truncate rather than emarginate; malar 

 space about two-thirds as long as basal width of mandibles; face 

 slightly narrower than vertex; and the sculpture and impressions of 

 the abdomen stronger than in female. 



In the 14 females at hand there is comparatively little variation 

 in size or structure. The largest is 16 Jnm. long, with abdomen 9.5 

 mm., exserted portion of ovipositor 4 mm. The smallest has the 

 corresponding measurements, 12 mm., 7 mm., and 3.5 mm. Among 

 the 25 males the variation in size is much greater, the largest being 

 14.5 mm. and the smallest 7.5 mm. long. In the smaller specimens 

 the propodcal spiracle is relatively much broader than in the larger 

 specimens. 



Distribution. — Specimens in National Museum from Nova Scotia, 

 New Hampshu-e, Massachusetts, New York, Peimsylvania, Michigan, 

 Wisconsin, Minnesota, Vancouvei", Washington, California, New 

 Mexico, Virginia, Colorado. 



Hosts. — The reared specimens in the United States National 

 Museum are from the following hosts: Leucania unijmncta, Orgyia 

 hadia, Malacosoma disstria, and Olene pinicola. Other host records 

 gleaned from literatm'e are as follows: Galls of Saperda concolor,^ 

 Heterocampa guttivitta,^ gypsy moth {Porthetria dispar),^ Pyrrharctia 

 isahella* Tortrixfumiferana.^ In the case of the last record Fernald 

 states that the parasites must oviposit in the host larva, for the 

 material from which they came was received as larvae. Bruner * 

 noted the same phenomenon, the host in this case being Malacosoma 

 disstria. 



EPHIALTES (EPHIALTES) YAKUTATENSIS (Ashmead). 



Pimpla yakutatensis Ashmead, Proc. Wash. Acad. Sci., vol. 4, 1902, p. 200, male. 

 Type, Cat. No. 5621, U.S.N.M. 



Besides the unique type there are in the United States National 

 Museum four other males of this species, all from Alaska, but no 

 females. It is probably more closely allied to pedalis (Cresson) 



> Davis, Ins. Life, vol. 4, p. 66. <Fiske, Tech. Bull. 6, N. H. Expt. Sta., p. 20K 



2 Patch, Miss E. M., Me. Expt. Sta. BuU. 162, p. 365. oFernald, Kept, on Gypsy Moth, p. 377. 

 "Ins. Life, vol. 5, p. 339. «Neb. Expt. Sta. Bull. 14, p. 29-32. 



