4′. The anal segment of the males arched, straight behind. No supra-anal lamina in the female. The species are American. Tribe 2. Bacunculides.
3′. Median segment as long as, or longer than the metanotum. Species with the male or both sexes winged.
4. Females apterous or rarely possessed of short wings.[[207]] Males winged. Femora dentate beneath, or lobed, or at least armed with one tooth. Species occur both in America and in the Old World. Tribe 3. Bacteriides. (Fig. 162, Palophus centaurus.) 4′. Each sex winged. Femora smooth beneath. The species belong to the Old World. Tribe 4. Necroscides. (Fig. 159, Calvisia atrosignata.)
2′. Antennae (at any rate in the females) shorter than the front femora, the joints distinct, not more than 28 in number. The species belong to the Old World.
3. Median segment shorter than the metanotum. Apterous species. Cerci plump. Tribe 5. Clitumnides. (Fig. 160, Eurycantha australis.)
3′. Median segment longer than the metanotum. Species usually winged. Cerci (except in some genera of the group Platycraninae) flattened, elongate. Tribe 6. Acrophyllides. (Fig. 153, Cyphocrania aestuans.)
1′. Tibiae furnished beneath with a triangular apical area.
2. Antennae many jointed, longer than the front femora.
3. Median segment shorter than the metanotum. Apterous species.[[208]]
4. Either head, thorax, or legs spiny or lobed. Tribe 7. Cladomorphides. (Fig. 149, Heteropteryx grayi.)