"'Although the hot climates abound in every part with insects of the locust and cicada kinds, insomuch that their chirping, particularly that of the cicadas, becomes in some instances intolerable; yet in the sandy plains before mentioned, which are thinly covered with grass, their numbers are immensely greater, and of various kinds, sizes, and colours, skipping or flirting about in all directions at every step of the traveller.' Perhaps, indeed, their kinds may not be so various as one would at first imagine, the same insect differing so much from itself in the various periods of its life. From the fact however here mentioned, it seems most certain that these insects breed under ground in Africa, as well as in these climates, according to Linnæus and other entomologists." From the knowledge which we possess at the present time relative to the economy of this tribe of insects, it is necessary to observe, upon the last above-quoted passage, that the term "breeding under ground," must be restricted to the mere circumstance of the eggs being buried beneath the surface of the earth, because the insects in all their active stages (including that of the pupa) feed upon grass and other vegetable substances above ground. In following up the very proper plan proposed and partially effected by Mr. Kirby, in the Zoological Journal, of restoring to the primary divisions of the Linnæan genus Gryllus the names which he gave to them, and which have been so confusedly employed by Fabricius and the French entomologists, and of which I have elsewhere given a more complete explanation, it is necessary that the generic name Locusta should be restored to the true migratory locusts composing the genus Acrydium of Latreille, and that a new name (Rutidoderes) should be given to the subgenus Acrydium of Serville, comprising the present and other allied species. {121}LOCUSTA TARTARICA? Plate XLIX. fig. 2. ORDER: Orthoptera. SECTION: Saltatoria. FAMILY: Locustidæ (Acridites, _Serv._) GENUS. LOCUSTA. Gryllus; Sect. Locusta, _Linn._ Gryllus, _Fabr._ Acrydium, _Latr._ (SUBGENUS: Locusta. Oedipoda, _Serville_.) LOCUSTA TARTARICA. Thorace subcarinato tripartito; fusco, lineâ dorsali pallidâ; elytris fulvescentibus fusco punctatis, alis hyalino subvirescentibus. (Expans. Alar. 4 unc. 6 lin.) SYN. Gryllus tartaricus? _Linn. Syst. Nat._ 1. 2. _p._ 700. 42. _Fabr. Ent. Syst._ 2. 53. _Serville Revis. Orthopt. p._ 92. (Acryd. t.) Gryllus americanus, _Drury, App. vol._ 2. HABITAT: Virginia, Antigua, New York, Madras, and Sierra Leone (_Drury_). "Tartaria et Africa." (_Linn._)