ORTHOPTERA. 151 



This inscc't was brought to mc, from Martha's Vineyard, l)y 

 Mr. Robert Treat Faine. It bears a close resemblance in form 

 to Acrijdium Aniericanum of De Geer, a much larger and more 

 showy Southern species. 



2. Acrijdium Jlavo-vittatum* Yellow-striped locust. 



Dull green or olive-colored, with a yellowish line on each 

 side from the forehead to the tips of the wing-covers; hind- 

 most shanks and feet blood-red, the spines tipped with black ; 

 wings transparent, faintly tinged witli pale green, and netted 

 with greenish brown lines. The abdomen of the male is very 

 obtuse and curves upwards at the end, and is furnished, on 

 each side of the tip, with a rather large oblong square append- 

 age, which has a little projecting angle in the middle of the 

 lower side. Length, to tip of the abdomen, from 1 inch to 1^; 

 expands from 1^ inch to 2 inches. 



This and the following species probably belong to the sub- 

 genus Oxya of Serville. The yellow-striped locust is one of 

 our most common insects. It is readily known by its color, 

 and by the two yellowish lines on the thorax, extending, when 

 the insect acquires wings, along the inner margin of the wing- 

 covers. It is very troublesome in gardens, climbing upon the 

 stems of beans, peas, and flowers, devouring the leaves and 

 petals, and defiling them with its excrement. The young 

 begin to appear in June, and they come to their growth and 

 acquire their wings by the first of August. When about to 

 moult, like other locusts, they cling to the stem of some plant, 

 till the skin bursts and the insect withdraws its body and legs 

 from it, and leaves the cast-skin still fastened to the plant. 



3. Acrydiuni femur-ruhrum. Red-legged locust. 



Grizzled with dirty olive and brown ; a black spot extending 

 from the eyes along the sides of the thorax ; an oblique yellow 



* This species agrees, in some respects, with Serville's Acrydium olivaceum, but 

 it is a smaller insect, the hind shanks are not blue, and the last ventral segment 

 of the male is not deeply notched at tip, but is entire and somewhat pointed. It 

 does not agree any better with Say's description of Gryllus hivittatus, which 

 possibly is the same as Serville's species above named. 



