(a) Vesperoctenus flohri, male, hind coxae, ventral view (the dense ventral pilosity was largely removed); (b) Vesperus strepens, male (cleared specimen), dtto; (c) V. strepens, male (cleared specimen), metendosternite, dorsal view. Lettering: arm – metendosternal arm; at – anterior tendon; lam – metendosternal lamina; st – basal stem.