EXPLANATION OF PLATES. 



PART I.— HARYESTING ANTS. 



Plate I., p. 21, fig. A. — View of the entrance to a nest of Atta barbara, 

 showing part of a train of ants bearing seeds, the conical mound of 

 refuse thrown out, and some seedlings, which have sprung up from 

 seeds accidentally dropped by the ants ; B, one of the larger workers of 

 this species, of the natural size, andB 1, its abdomen and pedicle, with 

 two nodes, magnified ; C*, one of the smaller workers, of the natural 

 size ; C, a male, of the natural size ; D, a female, of the natural size ; 

 D 1, wing of the same, magnified; I) 2, mouth organs of the same, 

 magnified, with the mandibles removed, the two outer pieces being the 

 maxilhie and their palpi, and the lozenge- shaped piece the labium, from 

 the upper part of which the labial palpi spring, while behind the labium 

 is the true tongue ; D 3, one of the mandibles, magnified ; E, a larva, 

 of the natural size, and E 1, the same, magnified. 



Plate II., p. 22, fig. A. — A trowel containing earth, in which a granary 

 full of seeds is lying almost undisturbed, of the natural size ; B, the 

 crater-like entrances found at the mouths of the nests of Atta str actor, 

 reduced to one-half the natural size. 



Plate III., p. 23. — The floors of three granaries of Atta barbara, surrounded 

 by the much coarser gravelly earth, of the natural size. 



Plate IV., p. 31. — A mass of earth pierced by roots, in which the ants 

 {Atta barbara) have made their gi-anaries and galleries. The galleries 

 were full of seeds when first laid open. Of the natural size. 



Plate V., p. 33, fig. A. — Galleries and terminal cells of a nest of Atta 

 barbara, excavated in the living sandstone rock, drawn in situ, of the 

 natural size ; B, part of a cylindrical gallery from another rock-nest, 

 and B 1, the same gallery seen in front, of the natural size. 



Plate VI., p. 35, fig. A. — A sprouting hempseed, part of the radicle of 

 which has been gnawed by the ants, of the natural size ; A 1, the same, 

 magnified, rad. radicle ; A 2, an entire sjjrouting seed of the same, 

 magnified ; B, a sprouting pea, part of the radicle of which has been 

 gnawed off; B 1, the same, magnified; B 2, the same stripped of its 



