wings transparent, tinged with green at the base; abdomen testaceous; hinder thighs angular, and spotted with black on the inner side; tibiæ red. Found abundantly in Egypt, Barbary, and in the south of Europe; occasionally extending as far north as Paris and even Britain.
LOCUSTA DUX.
Plate XV. Fig. 2.
One of the largest migratory locusts known; the tegmina often measuring eight or nine inches from one extremity to the other. The head is dull-yellow, with an olive tinge: the thorax dusky-olive, ridged on the sides, and having an elevated dentate ridge down the back; tegmina dull-green, with numerous ill-defined dark spots; wings red, with a black edge, and parallel rows of black spots, most of them resembling the beards of arrows: abdomen olive-green or yellowish; legs red; the thighs chequered with white. A native of tropical America.
LOCUSTA CRISTATA.
Plate XVI. Fig. 1.
A large species, sometimes measuring nearly four inches in length. Head and eyes brown; thorax olive-green, ridged along the back, and marked with four transverse impressions; tegmina greyish-green,
