The workers of the Dorylini at present known are without exception quite blind, and are believed to be all of predaceous habits; it is thought by some that they have no fixed abodes, but, like the Ecitonini, frequently change their residence, and it has been suggested that in doing so they make use of the nests of other ants as temporary abodes; all these points are, however, still unsettled, and as there are several genera it is not unlikely that considerable variety will be found to prevail. The driver ants of Africa, belonging to the genus _Anomma_, are in some {179}respects similar to _Eciton_ in habits, as they enter human habitations and cause nearly everything else to quit; it is probable that they are also exclusively carnivorous. Savage detected the nests of _A. arcens_, but the account he has given of them is too vague to permit one to decide whether the assemblages he saw were of a nomad kind. The workers of this species vary greatly in size, and Emery has recently stated that he believes all the supposed species of the genus to be merely varieties of _A. burmeisteri_. The female of the driver ants is still quite unknown. A _Dorylus_ has been ascertained to be the male of _Typhlopone_. The male _Dorylus_ (Figs. 79, A, and 80) is of great interest, for the propodeum is in a more primitive form than it is in any other petiolate Hymenopteron known to us, while at the same time the pronotum and mesonotum are very highly developed. The genus _Typhlatta_ Sm. has been recently identified by Wroughton and Forel as the worker-condition of which _Aenictus_ is the winged male. The genus _Alaopone_ will probably be found to have some species of _Dorylus_ as its male. [Illustration: Fig. 80—Body of male of _Dorylus_ sp. Delagoa Bay. _a_, pronotum; _b_, _c_, divisions of mesonotum; _d_, metanotum; _e_, propodeum; _f_, first abdominal segment; _g_, _h_, points of insertion of anterior and posterior wings.] The females of the Dorylides are amongst the rarest of Insects, and are also amongst the greatest of natural curiosities. Although worker ants and female ants are merely forms of one sex—the female—yet in this sub-family of ants they have become so totally different from one another in size, form, structure, and habits that it is difficult to persuade oneself they can possibly issue from similar eggs. In the Insect world there are but few cases in which males differ from females so greatly as the workers of Dorylides do from the females, the phenomena finding their only parallel in the soldiers and females of Termites; the mode in which this difference is introduced into the life of the individuals of one sex is unknown. The largest of all the Dorylides are the African Insects of the genus _Rhogmus_. Only the male is known.