Proceedings of the United States National Museum . te resembles that of many Ophioninae. Exetastes differs fromother Lissonotinae in having a complete epistoma, but the remainingcharacters, such as the shape of the mandible, are typical of the sub-family. Apart from the epistoma, Exetastes differs from the other twogenera of the Banchini examined in that there are teeth on the man-dibles. However, the structure of the spiracle is basically similar inthe three genera, the closing apparatus being as long as two or threetimes the depth of the atrium. In the Lissonotini the closing apparatusis app
Proceedings of the United States National Museum . te resembles that of many Ophioninae. Exetastes differs fromother Lissonotinae in having a complete epistoma, but the remainingcharacters, such as the shape of the mandible, are typical of the sub-family. Apart from the epistoma, Exetastes differs from the other twogenera of the Banchini examined in that there are teeth on the man-dibles. However, the structure of the spiracle is basically similar inthe three genera, the closing apparatus being as long as two or threetimes the depth of the atrium. In the Lissonotini the closing apparatusis approximately of the same length as the atrium. The following were examined: Exetastes bijenestratus Cushman(fig. 40a), E. illinoiensis (Walsh), Ceratogastra ornata ornata (Say)(fig. 40b), Banchus femoralis Thomson (fig. 40c), Cresson. The following are figured in the literature: Exetastes cinctipes(Ratzeburg) (Beirne, 1941), Exetastes sp. (Snodgrass, 1935), Banchusfemoralis Thomson (Beirne, 1941). 464 PROCEEDINGS OF THE NATIONAL MUSEUM. O-t mm Figure 40.—Lissonotinae:Banchini, head sclerites: a, Exetastes hifenestratus Cushman;B, Ceratogastra ornata ornata (Say); c, Banchus femoralis Thomson. (1, antenna; 2,spiracle; 3, skin.) ICHNEUMONID FINAL INSTAR LARVAE—SHORT 465 Subfamily Mesoleiinae Figures 41-44 Members of this subfamily are internal parasites of Tenthredi-noidea.^ The dorsal part of the epistoma is unsclerotized or lightly sclero-tized; the pleurostoma is usually lightly sclerotized: the hypostomaand hypostomal spur are well sclerotized, the hypostomal spur beingrelatively longer than in most Ophioninae; the stipital sclerite is welldeveloped and a lightly sclerotized cardo is sometimes present; thelabial sclerite is present and may be incomplete ventrally; in somegenera the dorsal ends of the labial sclerite bear small bubble-likeprojections; a prelabial sclerite is present and two sensilla are usuallypresent on the dorsal part of this sclerite; the max
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