1. Pheidole megacephala ^HNS

, Smith, Proc. Linn. Soc. Supp. v. 112. 5.

Mr. Wallace has sent a series of workers of this species collected from the nest. These contain, as it were, three modifications of the enormously large-headed individuals; all of these have heads similar in form, subquadrate, longitudinally striated anteriorly, and transversely so behind; these I should call varieties of the worker major; the worker minor has the head subovate in form, smooth, polished and shining; not striated behind, and very faintly so anteriorly. The links which would unite these two distinct forms of the working ants are wanting. I am therefore still of opinion that societies of ants generally possess two distinct sets of workers whose functions are totally different; this is known to be the case in slave-making communities, and also in the remarkable genus Eciton ^HNS, of which only the workers are known.