Proceedings of the United States National Museum . of this tribe parasitize wood-boring Coleoptera and only specimen examined was Rhyssa sp. (fig. 8b). The dorsal part of the epistoma is not sclerotized and the pleuro-stoma is lightly sclerotized; the hypostoma and hypostomal spur arewell sclerotized and the hypostomal spur is broad at its dorsal end;the stipital sclerite is well sclerotized and is broad at its lateral end;the labial sclerite is sharply pointed ventrally; the maxillary andlabial palps each have two sensilla, one round and one crescentic; thedorsal part of the labr
Proceedings of the United States National Museum . of this tribe parasitize wood-boring Coleoptera and only specimen examined was Rhyssa sp. (fig. 8b). The dorsal part of the epistoma is not sclerotized and the pleuro-stoma is lightly sclerotized; the hypostoma and hypostomal spur arewell sclerotized and the hypostomal spur is broad at its dorsal end;the stipital sclerite is well sclerotized and is broad at its lateral end;the labial sclerite is sharply pointed ventrally; the maxillary andlabial palps each have two sensilla, one round and one crescentic; thedorsal part of the labral sclerite is not sclerotized; the mandible has aslender blade with a dorsal and ventral row of small teeth; there is asmall, lightly sclerotized plate on the clypeus; the antenna is papil-liform; the atrium of the spiracle is funnel-shaped and the closingapparatus, which has relatively thick walls, adjoins the atrium; theskin has setae of moderate size but no spines. Rhyssa sp. is figured by Beirne (1941). 412 PROCEEDINGS OF THE NATIONAL MUSEUM. Figure 8.—Pimplinae, head sclerites: a, Neoxorides borealis (Cresson) (Neoxoridini); b,Rhyssa sp. (Rhyssini). (1, antenna; 2, spiracle; 3, skin.) ICHNEUMONID FINAL INSTAR LARVAE—SHORT 413 Tribe Theroniini Figure 9a The only species examined was Theronia atalantae (Poda) (fig. 9a),The species of Theronia are usually primary and secondary parasitesof the pupae of Lepidoptera. The dorsal part of the epistoma is unsclerotized and the pleurostomais lightl}^ sclerotized; the hypostoma and hypostomal spur are slenderand well sclerotized; the stipital sclerite is lightly sclerotized and avery lightly sclerotized cardo is present; the lateral parts of the labialsclerite are slender and well sclerotized and the ventral part is broadand lightly sclerotized; each maxillary and labial palp has two sensilla,one round and one crescentic in shape; the labral sclerite is present;the mandible has a broad base and the blade is bifurcated with onepar
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