LOCUSTID.E. 
257 
wings transparent, tinged with green at the base ; ab- 
domen testaceous ; hinder thighs angular, and spotted 
with black on the inner side; tibiae 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. 
Gryllus Dux, Linn. Fair. — Drury , PI. XLIV. — Encycl. 
Method. No. 4, ( Acrydium ). — ServiUe's Revis. Orth. 92. 
One of the largest migratory locusts known ; the teg- 
mina often measuring eight or nine inches from one ex- 
tremity 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 par- 
allel rows of black spots, most of them resembling 
the beards of arrows : abdomen olive-green or yel- 
lowish ; legs red ; the thighs chequered with white. 
A native of tropical America. 
LOCUSTA CRISTATA. 
Plate XVI. Fig. L 
Gryllus Cristatus, Linn. Fair. — Roesel's Insect, tom. ii. Gryll. 
PI. 5, figs. 1, 2. — Stoll's Sauterelles de passage , PI. 9 b. fig. 30. 
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, 
it 
