55 



in any number in spring to resort to tlie dozers at first opportunity. I 

 believe active use of these measures will be elfectual, with a cost but 

 tritbtij;' compared with the value of the c.vo]) to be saved. 



The information as to the species and the measures needed are gov- 

 ered very fully in your Bulletin on Destructive Locusts, and with some 

 specific instruction regarding; the treatment of ditches in this special 

 locality would, I think, give the people of the district atfected all the 

 information necessary to protect themselves, and it would seem advisa- 

 ble to send a number of copies of that bulletin to the postmasters at 

 Garden City, Lakin, and Syracuse to distribute to farmers, who would 

 make use of them, as well as to those whose names I will furnish for 

 this purpose. 



OTHER SPECIES OBSERVED. 



The species next to differenUaUs that I should call most abundant in 

 the injured fields was hivittatm ; but taken alone its damage would 

 have been insignificant. Its habits are so nearly like those, oi differ- 

 entiaUs that I see no occasion to give it further mention, and I have 

 little doubt that any measures adopted against differentialis will prove 

 as effective against this species. 



Still other species occurred, but seemed generally distributed, and so 

 far as injury in the devastated fields is concerned need no mention. 



THE LONG-WINGED LOCUST. 



Dissosteira longipennis was taken in some numbers at all points vis- 

 ited in Finney, Kearney, Hamilton, and Greeley Counties, and as this 

 species has caused so much injury in eastern Colorado this season, I 

 took rather special pains to note its abundance and inquire as to any 

 destruction resulting from it. At no point did it occur in destructive 

 numbers, and I should not look for any injury from it in these localities 

 in the near future at least. 



Most of those noticed were winged, some still fresh from the pupa 

 stage. In general all the winged ones, when disturbed, moved south- 

 ward, but nothing like a general migration was seen. At Lakin I was 

 told by a Mr. Logan that a large black- winged grasshopper had been 

 common near that place, and when winged had traveled uniformly 

 southward. 



PARASITES AND DISEASE, 



The many parasitized grasshoppers noted indicated a multiplication 

 of such forms and these will undoubtedly accomplish much in reducing 

 the numbers that can deposit eggs this fall, but I should deem it un- 

 wise to depend on them and to omit the active measures already urged. 



The most general parasite was apparently the Tachina flies, as the 

 great majority' of dead hoppers were found to be completely devoured 

 within, and in most cases the opening through which the maggot had 



