120 

 Head green. Eyes perfectly round and dark brown, very prominent, and standing at a little 

 distance from each other. Antennae 18-jointed, longer than the thorax, which is dark green, and on 

 the upper part gibbous ; having on each side three swellings, each of which tenninates in three short 

 and thick spines. Tegmina darkish green, with a great number of small black spots on them of different 

 shapes. Wings scarlet, spotted with black ; the spots being larger than those of the wing-cases, and of 

 different shapes. Abdomen green, with several yellow rings surrounding it, and about the same length 

 as the tegmina. Legs green ; the thighs being armed with spines. 



Our author states, that he was informed by a gentleman who lived several years at 

 Sierra Leone, and by whom this species was communicated to him, that " they appear 

 about the end of June, and soon afterwards retire among the branches of the palm 

 trees, where they reside tiU the violent rains compel them to quit that situation, and live 

 among the plants, &c. on the ground." In the Introduction to the third volume, he how- 

 ever states on the authority of Mr. Smeathman, that " this beautiful locust is an inhabitant 

 of the sandy plains, called Savannas, which indeed abound with palms ; but my friend is 

 in doubt whether they have any kind of predilection for those trees. 



" ' 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 men- 

 tioned, it seems most certain that these insects breed under groimd in Africa, as well as in 

 these climates, according to Linnaeus 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 Linnsean genus GryUus 

 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. 



