Proceedings of the United States National Museum . in.) 458 PROCEEDINGS OF THE NATIONAL MUSEUM Larval Key 1. Three prominent setae situated beneath each labial CoelichneumonSix prominent setae situated beneath each labial . Protichneumon Tribe Trogini Figure 36b Species of Tragus and Macrojoppa are parasites of rest of the genera attack Sphingidae. Tragus pennator (Fabricius) (fig. 36b) was examined. This speciesdiffers from other Ichneumonines examined in that the hypostoma issharply bent. Subfamily Mesochorinae Figure 37 All members of this subfamily are believ
Proceedings of the United States National Museum . in.) 458 PROCEEDINGS OF THE NATIONAL MUSEUM Larval Key 1. Three prominent setae situated beneath each labial CoelichneumonSix prominent setae situated beneath each labial . Protichneumon Tribe Trogini Figure 36b Species of Tragus and Macrojoppa are parasites of rest of the genera attack Sphingidae. Tragus pennator (Fabricius) (fig. 36b) was examined. This speciesdiffers from other Ichneumonines examined in that the hypostoma issharply bent. Subfamily Mesochorinae Figure 37 All members of this subfamily are believed to be endoparasites andsecondary parasties. Mesochorus discitergus (Say) (fig. 37) and Mesochorus sp. wereexamined. The larval characters of the specimens examined indicate anisolated group. Those head sclerites present are lightly sclerotized;the epistoma is unsclerotized; the pleurostoma is present; only themedian part of the hypostoma is sclerotized in Mesochorus, but theentire hypostoma is sclerotized in Astiphromma strenuum (Holmgren). 0-1 m Figure 37.—Mesochorinae, head sclerites: Mesochorus discitergus (Say). (Antenna notvisible on preparation; 2, spiracle; 3, skin.) ICHNEUMONID FINAL INSTAR LARVAE—SHORT 459 (Beii-ne, 1941); the hypostomal spur is very lightly sclerotized; thestipital sclerite is slender and its lateral end has a small enlargementbearing a sensillum; the labial sclerite is slender; the silk press is notsclerotized; each maxillary and labial palp bears two sensLlla,one largeand one small; there is no prelabial sclerite and no labral sclerite;two small sensilla are present on the labrum, but labral, maxillary,and prelabial setae appear to be absent; the form of the mandible isdistinctive, the base having only the circumference sclerotized andwith the blade long, slender, and slightly curved; the width of thebase of the mandible is approximately equal to two-thirds the length ofthe blade; the spiracle is relatively small and the length of the thin-wa
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