ii. The group Dorylini includes the genus _Dorylus_, which was founded many years ago for Insects very like _Labidus_. As in the case of the American Insect named, males only were known; two or three allied genera, consisting exclusively of individuals of the sex mentioned, were subsequently described. In the {178}regions inhabited by these males numerous species of blind ants are known, but only in the worker form, and were, or still are, referred to genera called _Typhlopone_ and _Anomma_. Nothing that could be considered to be a female pertaining to any of these Insects was discovered until Gerstaecker described under the generic name _Dicthadia_ an extraordinary apterous female ant found in Java, and it was suspected that it might be the long-expected female of the male _Dorylus_ and of the worker _Typhlopone_ or _Anomma_. This remained for many years without confirmation, but in 1880 Trimen announced the discovery in South Africa of an enormous apterous female ant, allied to _Dicthadia_; it had been disinterred from a nest of small red ants believed (wrongly) to be _Anomma_. As _Dorylus_ had been previously found in connection with allied worker ants it has since then been clear that notwithstanding the enormous differences existing between these three forms they may all pertain to one (or to closely allied) species. From this summary the student should understand that he will find in myrmecological literature many references to two or three genera that really belong to one species. [Illustration: Fig. 79—_Dorylus helvolus._ Africa. A, male; B, female (_Dicthadia_); C, worker major (_Typhlopone_); D, worker minor. (After Emery.)]