In the males of the genus Cedeocera the tips of the elytra are drawn out into processes almost as long as the elytra themselves, and rivalling the forceps of earwigs.
The stature of the individuals of the same species is, in some of these Brenthidae, subject to extreme variation, especially in the males, some individuals of which—in the case of Brenthus anchorago—are five times as long as others.
This remark applies to the Strepsiptera parasitic on Hymenoptera: nothing whatever is known as to the life-histories of the species that attack Hemiptera.
Although not an invariable, it seems that it is a general rule that the Stylops produced from the body of one individual are all of one sex; it has even been stated that female bees produce more especially female Stylops, and male bees male Stylops. If any correlation as to this latter point exist, it is far from general.
Von Siebold, Arch. Naturges. ix. 1843, pp. 137-161. Nassonoff's recent paper is in Russian, but so far as we can gather (cf. Zool. Centralbl. i. 1894, p. 766), it does not add greatly to the data furnished by von Siebold.