42 



INJURIOUS INSECTS OF KANSAS. 



Rocky Mountain Locust (M. spretus Thomas), being distinguished 

 from it by the shorter forewings (never extending, when folded, 

 beyond tip of abdomen) and the bluntly rounded and broadly 

 notched, instead of the rather narrowly rounded and acutely 

 notched (spretus) tip of the last abdominal segment of the male. 

 (See Fig. 12.) Our native Red-leg is non-migratory, and, while 

 appearing locally numerous, rarely does serious damage. It ap- 

 pears, winged, about the middle of August, or a little later. 

 Doctor Riley has noted that the period between hatching and 

 maturity, at St. Louis, is about 70 days. 



DIFFERENTIAL LOCUST (Melanoplus differentialis Thomas). 



This is one of the most common native locusts, and often does con- 

 siderable local damage, especially in the southwestern part of the 



State. This locust 

 is larger than spre- 

 tus or femur-ru- 

 brum, being about. 

 1 J inches long and 

 its wings expand- 

 ing 2 i inches, and 

 is of a general 

 bright yellowish- 

 green color. "The 

 head and thorax 

 are olive-brown,, 

 and the front 

 wings, very much 

 of the same color 

 and without other 

 marks, have a 

 brownish shade at 

 base; the hind wings being tinged with green; the hind thighs 

 are bright yellow, especially below, with the four black marks as 

 in spretus; and the hind shanks are yellow with black spines, 

 and a black ring near the base." This locust is partial to alfalfa 

 and to various shade-trees. 



TWO-STRIPED LOCUST ( Melanoplus bivittatus Say). 



This locust is of about the same size as differentialis, resembles 

 it considerably, and is found in company with it. It is distin- 



FIG. 20. DIFFERENTIAL LOCUST. 



