. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BRUES: PARASITIC HYMENOPTERA. 83 EXETASTES INVETERATUS, Sp. nOV. (Fig. 63.) Female. Length 7 mm. Very dark colored, the abdomen except at the base much lighter. Rather stout, the head thin antero-posteriorly. Antennae long and slender, brown, the joints of the flagellum toward the base about twice as long as wide. Mesonotum minutely punctulate; metathorax not areolated, although there are some slight irregular indications of carinae. Abdomen stout, contracted sharply at the base, but not petiolate; first seg- ment thr
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BRUES: PARASITIC HYMENOPTERA. 83 EXETASTES INVETERATUS, Sp. nOV. (Fig. 63.) Female. Length 7 mm. Very dark colored, the abdomen except at the base much lighter. Rather stout, the head thin antero-posteriorly. Antennae long and slender, brown, the joints of the flagellum toward the base about twice as long as wide. Mesonotum minutely punctulate; metathorax not areolated, although there are some slight irregular indications of carinae. Abdomen stout, contracted sharply at the base, but not petiolate; first seg- ment three-fourths as long as the sec- ond; third and fourth together as long as the second, fifth and sixth smaller. Ovipositor two-thirds as long as the abdomen, black. The abdomen is smooth except the first segment which Fig. 63.— Exetastes inveteratus, sp. is quite distinctly although delicately nov. Type, punctured. Wings hyaline; stigma and veins fuscous; areolet large, quadrangular, oblique, subsessile above; marginal cell broad, sharply pointed apically, the second section of the radius about two and one-half times as long as the first; stigma large, subtriangular; discocubital vein sharply bent, but without trace of a stump of a vein; sub- median cell considerably longer than the median. Type.— No. 2270, M. C. Z., Florissant, Col. (No. 7512, S. H. Scudder Coll.). This species resembles in superficial appearance some of the species of Mesochorus described in the present paper, but differs by the much more sessile attachment of the abdomen and by the convex, non- areolated metathorax. A considerable series of species occur at Florissant, seven in all, which I have placed provisionally in the genus Mesochorus although they are not very typical. In all of them the areolet is much smaller than in recent forms, but otherwise they are quite similar. A very typical species of Mesochorus has been described by Scudder ('90) from the Oligocene of Green River, Wyoming, but by him made
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