ORTHOPTERA. 147 



10. Locusta (Tragocephala) infuscata. Dusky locust. 



Dusky brown ; thorax with a slender keel-like elevation ; wing- 

 covers faintly spotted with brown ; wings transparent, pale green- 

 ish yellow next to the body, with a large dusky cloud near the 

 middle of the hind margin, and a black line on the front margin ; 

 hind thighs pale, with two large black spots on the inside ; hind 

 shanks brown, with darker spines, and a broad whitish ring below 

 the knees. Length f inch ; exp. above 1| inch. 



This somewhat resembles the clouded locust, from which, 

 however, it is easily distinguished by its much shorter antennas and 

 the dusky cloud on the hinder margin of the wings. I have cap- 

 tured it in pastures, in the perfect state, from the middle of May 

 to near the end of July. I believe that it has never been de- 

 scribed before. 



11. Locusla (Tragocephala) viridi-fasciata. Green-striped locust. 



Green ; thorax keeled above ; wing-covers with a broad green 

 stripe on the outer margin extending from the base beyond the mid- 

 dle and including two small dusky spots on the edge, the remainder 

 dusky but semitransparent at the end ; wings transparent, very pale 

 greenish yellow next to the body, with a large dusky cloud near 

 the middle of the hind margin, and a black line on the front mar- 

 gin ; antennas, fore and middle legs reddish ; hind thighs green, 

 with two black spots in the furrow beneath ; hind shanks blue- 

 gray, with a broad whitish ring below the knees, and the spines 

 whitish, tipped with black. Length about 1 inch ; exp. from 

 more than If to nearly 2 inches. 



This insect is the Jlcrydium viridi-fasciatum of De Geer, who 

 was the first describer of it, the Gryllus Virginianus of Fabri- 

 cius, the Gryllus Locusta chrysomelas of Gmelin, the Jlcrydium 

 marginatum of Olivier, and the Acridium hemipterum of Palisot 

 de Beauvois. It is remarkable that a species, so strongly marked 

 as this is, should have been so profusely named. Palisot de 

 Beauvois seems to have selected the most appropriate name for 

 it ; for the green portion of the wing-covers is thick and opake, 

 and the dusky portion thin and semitransparent, as in the wing- 

 covers of Hemipterous insects. It is very common in pastures 



