OETHOPTERA OF INDIANA. 30T 



capable of laying upwards of 100. The eggs remain upon the ground 

 all through the winter and hatch for the most part during the month 

 of May. Some of them, however, continue hatching much later, so 

 that all through the summer and even into the fall, young individuals 

 may be found. The insect changes very little in appearance from 

 birth to maturity except so far as color is concerned, and moults but 

 twice. Growth is rapid, averaging, under favorable circumstances, 

 about six weeks from birth to maturity. With age the green color 

 gives way to various shades of gray and brown. In this way we find 

 great correspondence with its surroundings. While the vegetation is 

 green, the walking sticks are green also; when the foliage turns in 

 autumn, they change color correspondingly, and when the foliage is 

 stripped they so closely resemble, in both appearance and color, the 

 twigs upon which they rest — the habit of stretching out the front legs 

 and feelers greatly enhancing the resemblance — that when they are 

 few in number it is dilficult to recognize them. A few green speci- 

 mens, more particularly of the males, may always be found, even 

 among the mature individuals." 



This Walking-stick appears to be abundant in any certain locality 

 only every other year. This is in part due to an increase of the in- 

 sect's natural enemies on those years in which they are most abun- 

 dant. These enemies are several species of true bugs (Hemiptera- 

 Heteroptera) crows and other birds. The main reason for the greater 

 number of Walking-sticks on alternate years is, however, thought to 

 be due to the fact that the larger proportion, of the eggs, especially 

 those laid late in the autumn, take two years in hatching. If at any 

 time the insect threatens to become injurious in the woodlands of the 

 State, it can be held in check by burning the leaves on the ground 

 in the Avinter season, thus destroying the hibernating eggs. 



Sub-family ANISOMORPHIN^. 



In this sub-family the antennae are more than twice as long as the 

 anterior femora. The tibia? are furnished with a sunken areola be- 

 neath the apex, which receives the base of the tarsi when bent; coxae 

 visible from above; tarsi distinctly five-jointed. Mesothorax not 

 more than three times as long as the prothorax. Intermediary seg- 

 ment invisible. 



A single genus of this sub-family is represented in the United 

 States. 



