532 
INSECTS. 
unequal, the anterior with live joints, and the posterior with 
three; head large and vertical; eyes small, orbicular; thorax 
compressed on the sides, elytra inclined; abdomen of the female 
terminated with an edged tail; legs formed for leaping ; the an¬ 
terior ones appearing to grow from under the head ; the posterior 
ones very large and strong. 
Locusta flavipes. —The Yellow-Legged Locust. 
Plate XCIX. fig 9. 
Head, thorax, and abdomen dark purplish brown, wings 
dusky yellow 7 , thin and transparent; legs yellow. Inhabits 
Britain. 
Section III. 
The elytra and wings sloping like a roof; the posterior feet 
formed for leaping; the tarsi having all five joints; elytra in 
both sexes the same ; antennas shaped like a sw’ord, filiform, 
and clavate in both sexes, or in the males only. 
TRIBE VII.-ACRIDITES. 
The posterior feet are shorter than the body, weak, and not 
properly constructed for leaping ; body tumid; eyes equidistant. 
Genus ACRIDIUM.— Geoffroy. 
Generic Character. —With filiform antennae, inserted between 
the eyes a little way from the internal border; mouth uncovered ; 
palpi not compressed ; legs constructed for leaping; tarsi with 
three joints ; a spongy ball between the hooks. 
Acrydium migratorium. — The Migratory Locust. 
Plate XCIX. fig. 7. 
With yellowish-brown antennae ; head green or brown ; man¬ 
dibles bluish black ; thorax green and carinated ; dorsal lines 
and lateral spot black ; wdngs transparent and tinged with green ; 
feet dusky inside ; posterior thighs black, spotted ; legs reddish. 
Two inches long. Inhabits Europe and the Levant. 
ORDER VI—HEMIPTERA. 
Having two wings, covered by elytra; mouth formed for 
