[1312] Plate [XXVI.] Fig. 1. As the very remarkable maxillary palpi of that extraordinary Coleopterous genus Atractocerus seem not to have been so fully described as they deserve, I shall give here a minute detail of their composition. They consist of four joints: the first is wide and short, and somewhat platter-shaped; the second is much smaller and shorter: the third is concavo-convex, or shaped like a shallow bowl: towards the breast this joint is elevated, and on the elevated edge sits the last joint, which is longer than all the rest taken together. In my specimen it points towards the breast; its under side is entire and slightly curved, but in the upper side are two rows of lamellæ (b), placed alternately nine on each side, with an odd one at the end: these lamellæ are full of minute papillæ, and furrowed on the side next the mouth. From between the first pair a slender exarticulate hairy branch or appendage emerges (a), which forms nearly a right angle with the main stem. The labial palpi appear to consist of three joints; the two first very short, and the last large, ovate, and acute. This description is not taken from A. necydaloides, but from a Brazilian species more than five times its size, which I have named A. grandis.
[1313] Plate [VI.] [VII.] [XXVI.] e´.
[1314] Plate [VI.] Fig. 6, 12. e´. Cuvier Anat. Compar. iii. 347.
[1315] Cuvier Ibid.
[1316] Huber Fourmis, 4—.
[1317] Anim. sans Vertèbr. iii. 304.
[1319] Reaum. v. 309—.