158 INSECTS INJURIOUS TO VEGETATION. 



genus, which may receive the name of Tragocephala, or goat- 

 headed locusts. 



10. Locusta ( Tragocephala) infuscata. Dusky locust. 



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

 wing-covers faintly spotted with brown; wings transparent, 

 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 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 ^ inch ; exp. above 1|- 

 inch. 



This somewhat resembles the clouded locust, from which, 

 however, it is easily distinguished by its much shorter antennae 

 and the dusky cloud on the hinder margin of the wings. I 

 have captured 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 described before. 



11. Locusta {Tragocephala) viridi-fasciata. Green-striped 



locust. 



Green ; thorax keeled above ; wing-covers with a broad gi-een 

 stripe on the outer margin extending from the base beyond the 

 middle and including two small dusky spots on the edge, the 

 remainder dusky but semitransparent at the end ; wings trans- 

 parent, 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 margin ; antennae, 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 1|^ to nearly 2 inches. 



This insect is the Acrydium viridi-f as datum of De Geer, 

 who was the first describer of it, the Gryllus Virginianus of 

 Fabricius, the Gryllus Locusta chrysomelas of Gmelin, the 

 Acrydium marginatum of Olivier, and the Acridium he?)iipterum 

 of Palisot de Beauvois. It is remarkable that a species, so 

 strongly marked as this is, should have been so profusely 



