But natural selection can and does often produce structures for the direct injury of other species, as we see in the fang of the adder, and in the ovipositor of the ichneumon, by which its eggs are deposited in the living bodies of other insects.
The diagnostic characters of the species are the enlarged dorsal-longitudinal ridges on the basal half of the ovipositor, and the setose sclerotized posterior margin of the male seventh tergite.
Genera in this key are grouped by tribe, and some of these are based on the following structures: body size, pronotum, fastigium, cerci, subgenitalplate, and shape of ovipositor.
Pablo Vargas Lugo's recent exhibition "Ovipositor" surprisingly paralleled, whether intentionally or not, certain concepts integral to the poststructuralist thought of Jacques Derrida--dissemination and fertility, nakedness and its inescapable vulnerability, presupposed presence and factual appearance.
Diagnosis.--Species in this group are characterized by the more or less laterally compressed metasomal apex of females, with T4 - 7 always visible, and T1 nearly parallel sided; ovipositor and sheaths are relatively long and thick, with the sheaths rounded or lanceolate; antenna short with most flagellomeres only slightly longer than wide, antenna shorter than body, about as long as or shorter than forewing; forewing vein 1CUb more than 2 times longer than 1CUa, vein 1cua slightly inclivous, and vein M+CU more or less sinuate; hindwing with wing vein RS sinuate, marginal cell narrowest at middle, vein m-cu mostly present and interstitial to just antefurcal, vein M+CU a little longer than 1M; apex of hind tibia without modified comb of setae.
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