24 
During' the latter part of the dry season as the herbage and grasses 
ripen and dry up these insects gather from the surrounding hills upon 
the moist grounds at the margins of the valleys to feed upon the green 
vegetation still found at such places. Here also and close at hand the 
eggs for the spring brood are laid. Those for the fall brood are laid at 
random among the hills. In portions of California and Arizona there 
are two broods of this insect annually.* Wherever this is the case, 
there is considerable difference in the size and general appearance of 
the members that make up these two distinct broods. Those of the 
spring brood are larger and of a brighter color than those of the fall 
brood. 
The difference in size and " freshness" in general appearance between 
individuals of the two broods in this and other double-brooded lo- 
custs is evidently due to the climatic conditions and to the nature of 
the food supply at different times of the year. 
THE NARROW-WINGED LOCUST. 
(Melanoplus angustipennis Dodge.) 
Quite closely related to the preceding is another of our North Ameri- 
can locusts of the genus Melanoplus which should be included with the 
destructive species. While this insect, which we will call the Narrow- 
winged Locust, has never yet, to my knowledge, been sufficiently numer- 
ous to materially injure cultivated crops or even the grasses on the 
prairies, it has been greatly on 
the increase for the past seven 
or eight years. As stated in a 
former report, " Melanoplus an- 
gustipennis, which only a few 
years ago was quite rare and 
confined to low land along the 
Elkhorn River, is now becoming 
quite numerous. If the species continues to increase as rapidly during 
the next four or five years as it has during the past few, it will be 
equally as destructive as femur-rubrum, devastator, atlanis, and differ- 
entials. When first described it seemed to be confined almost exclu- 
sively to Artemisia ludoviciana as a food plant. Now it seems to take 
to almost any food plant that presents itself. This Narrow- winged 
Locust is more nearly related to M. devastator than to any of our other 
especially injurious species. Should it really become a pest, as present 
indications would suggest, its arboreal habit will render it rather a dif- 
ficult enemy with which to deal. 
Fig. 12. — Melanoplus angustipennis — normal size 
(original). 
*Mr. D. W. Coquillett in Bull. No. 27, Div. of Entomology, U. S. Dept. of Agri- 
culture (p. 39), states that he has taken both forms of this species in August, 1891, 
and believes the species to be single-brooded, and not double-brooded, as stated by 
Mr. Brunei.— C. V. R, 
