LEPIDOPTEROUS INSECTS. In Tro-Cortesianus 28c (Pl. 3, fig. 3) is shown a second insect larva with curiously formed mouth parts. It is represented as attacking agave which is springing from the ground as shown by the _Caban_ signs in the codex. Hough (1908, p. 591) has shown this to be the larva of _Acentrocneme kollari_ Felder, "called by the Mexicans _guson_, and in Nahuatl _mescuillin_." This grub, he says, is white, about an inch long, and tunnels the fleshy leaves of the agave. It is greatly prized as an article of food for "_gusones_ to this day are collected in April, boiled, wrapped in the epidermis of the agave, sold on the streets of Mexico, and are eaten with avidity. To all appearances they are nourishing and palatable, and it is said that connoisseurs prefer them to oysters or swallows' nests." Hough believes "that the discovery of the sap-yielding quality of the agave was through search for these larvae." In the Nuttall Codex occur numerous representations of insects, some of which appear to represent butterflies or moths (Pl. 3, figs. 5-8) but these are quite unidentifiable. That shown in fig. 6 is colored blue in the original, while the others are of various colors. Possibly the round markings on the wings in figs. 5, 8, represent the ocelli on the wings of certain species of moths. In this connection, too, it is interesting to compare the conventionalized butterfly with its single eye and pointed antennae from the Aubin manuscript (Pl. 3, fig. 9) with one drawn on the same plan from the Nuttall Codex (Pl. 3, fig. 8). MYRIAPODA Representations of a centipede (probably a species of _Scolopendra_) occur in the Dresden Codex and in several others examined. That shown in Pl. 5, fig. 1, from the Vaticanus 3773, is perhaps the least conventionalized.[303-*] This figure appears partly to encircle a temple, behind which the major portion of its length is hidden and hence is not here shown. The bipartite structure coming from the animal's head doubtless represents the mouthparts, and at its base on either side arise antennae. The first pair only of legs is shown with a pinching claw, possibly intended as a conventionalized hand, while the rest are simple. The plumes decorating the posterior extremity are of course extraneous and represent the tail of the quetzal or trogon.