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ARTICULATES I INSECTS. 



cases they move in swarms so great as to darken the sky, and the places where they alight 

 at once become destitute of a green leaf or a blade of grass. Many of them produce a 

 stridulating noise by rubbing their thighs against their wing-covers. 



The Genus Caloptenus contains the Red-legged Locust 



and its immediate allies. 



The Red-legged Locust, C. femur-rubrum, Burm., is 



about an inch long, grizzled with dingy olive and brown, and the hindmost shanks and 

 feet are blood red, with black spines. 



The Genus Acrydium embraces the largest members 



of the family, including the celebrated Migratory Locusts of the East. Some tropical 

 species are four inches long. 



The Genus (Edipoda contains the most 



common large species of the United States. 



The Carolina Locust, (E. Carolina, 



Burm., is about one inch and a half long, pale yellowish-brown, the 

 under wings black with a broad yellow hind margin. 



The Coral-winged Locust, (E. phceni- 



coftera, Germ., is about one inch and a half long, and is light 

 brown spotted with dark brown on the wing-covers, and the wings 

 are coral-red with an external dusky border. 



The Yellow-winged Locust, (E. sulphu- 



rea, Burm., is about one inch long, and is dusky brown, the wings 

 deep yellow next the body, dusky at the tip, the yellow portion 

 bounded beyond the middle by a broad dusky brown band. 



The Clouded Locust, (E. nebulosa, 



Erichs., is about one inch long, dusky brown, with pale wing-cov- 

 ers clouded and spotted with brown, and the wings transparent. 



The Genus Tettix Grouse Locusts 



has the thorax greatly prolonged over the entire abdomen, and 

 Clouded Locust, (E. the wing-covers exceedingly minute. The species are small, gen- 

 nebulosa, Erichs. erally less than half an inch long, and extremely agile 



THYSANOURA, OR SPRING-TAIL FAMILY. This Family 



comprises insects which are wingless, and which remind us of the Myriapods. 



The Genus Podura has the body rather broad, and hairy, 



and the abdomen with setae converted into a forked tail bent beneath the body, and used 

 to aid in leaping. They are found in gardens, hot-beds, and on the surface of quiet pools. 



The Genus Lepisma is long, with silvery scales, and 



the abdomen has three long bristles. It is found among old books and woollens, and under 

 bark. 



SUB-SECTION VII. 



THE SUB-ORDER OF NEUROPTERA, OR NET-WINGED INSECTS. 



THE Sub-Order of Neuroptera embraces insects which 

 have four membranous net-veined wings, the hinder ones 

 largest, the mouth furnished with jaws, and the abdomen 



