1893-] ENTOMOLOGICAL NEWS. 263 



The most salient points of difference consist first in the food- 

 plant. C. bilineata feeding on the elm, always solitary, and H. 

 manteo on the oak, gregarious when young. Second in the width 

 of head; the full grown larva of C. bilineata having a head of 

 from 2.9 to 3.3 mm. in width, while that of H. manteo varies 

 from 4 to 4.3 mm. Besides these differences certain others are 

 to be observed in the markings. The dorsal line in the green 

 forms is narrower and more concrete in manteo, remaining clear 

 and distinct in the brown form, while in bilineata it is entirely 

 lost in this form. The dorsal space in the green form of bilineata 

 is usually shaded with white, contrasting with the green lateral 

 area; while in manteo it is green, concolorous with the sides, or 

 the sides are shaded with white, producing the reverse condition 

 to that seen in bilineata. 



I am unable to detect any other differences. Larvae collected 

 in Plattsburgh, N. Y. 



o 



GRASSHOPPERS AT DULUTH, MINN. 

 By FRANK S. DAGGETT. 



During the past Summer, Duluth and vicinity has been visited 

 by a grasshopper scourge, which remained with us until Septem- 

 ber, and as a result lawns are ruined, and flowers, except where 

 protected by a gauze, are a rarity. Aside from the fact the labor 

 of cutting lawns with a mower has been dispensed with all Sum- 

 mer, perhaps the most interesting thing in connection with this 

 visitation is its effect upon butterfly life. Usually, we have a 

 number of the most common varieties in profusion. Colias and 

 Pieris came out as usual in the Spring, but upon the advent of 

 the grasshoppers, which promptly devoured the red and white 

 clovers, they soon disappeared, except in places where the de- 

 struction was slow. Later in the season the second brood made 

 its appearance in very few numbers, and all through August, 

 when they are generally plentiful, only an occasionally fresh one 

 was to be seen, and one was as apt to meet it among dense brush 

 seeking for some hidden flower as the open clover fields had been 

 stripped of bloom by the grasshoppers. I do not remember 

 having seen a ragged or faded specimen during the season, which 

 would indicate, in the absence of flowers, death by starvation 

 before sufficient time had elapsed to make them weather worn. 



