172 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 



northeast ; on the 18th a large swarm was observed at Kearney, going 

 north ; on the 26th and 27th very heavy flights passed over Ogalalla 

 and North Platte toward the northwest. After this, until about the mid- 

 dle of June, flights are reported almost daily as passing over some part 

 of the State, chiefly Platte, Colfax, Keith, Phillips, Lincoln, and Butler 

 Counties, generally moving north, but in one or two instances westward. 

 In July, from the 8th to the 15th, occasional swarms were seen passing 

 northwest in the extreme eastern part of the State. 



There was really no one general movement of the locusts from this 

 State. South of the Platte they began to move in the latter part of 

 June (25 to 30), and later farther north and east, some not departing 

 until in August. 



The movement toward the south commenced early in July, as a report 

 from Mr. Dodge, of Glencoe, Dodge County, dated the 8th, states that 

 'Hhe locusts have been flying a little east of south for several days." 

 Professor Aughey, our assistant for Nebraska, observed what was in 

 all probability the same swarm passing south over Lincoln City on the 

 9th, flying, as he remarks, "high and in a heavy column." From the 

 11th to the 14th the movement was northward. On the 15th it was 

 again toward the south, and continued generally in that direction for a 

 week or ten days, and then again changed to the north. From this time 

 until the 5th of August the flights were mostly toward the north, but 

 irregular and variable. About this time (from 5th to 8th) the unusual 

 phenomenon of locust swarms flying in opposite directions at the same 

 time and place was observed on several different days in the area em- 

 bracing Knox County, Nebraska, Yankton, Dak., and Sioux City, 

 Iowa. Professor Aughey, who had visited this section on behalf of the 

 Commission for the purpose of noting the locust movements, fortunately 

 happened to be in this region at this time, and witnessed this unusual 

 occurrence, which will be more fully noticed and explained hereafter. 



After this until the last of September swarms were passing over in 

 various directions, but generally toward the south. 



Iowa. — The first flight observed in this State of which we have received 

 any account was on the 14th of June, in the extreme northwest part, be- 

 tween Le Mars, in Plymouth County, and Sioux Eiver. There are good 

 reasons for believing that these came from the northeast corner of Kan- 

 sas and the extreme southeast corner of Nebraska. It is almost certain 

 that they did not come from any part of Iowa, and it is certain that 

 locusts left Brown County, Kansas, on the 13th. These came down in 

 the vicinity of Sioux City, where they remained some days. Those 

 hatched in the extreme southwestern part of the State commenced leav- 

 ing Fremont County on the 22d of June. Between this date and July 

 10 most of those hatched in the State took wing, moving northward. 

 About the middle of July the southward flights commenced and con- 

 tinued, with intervals of northward movements, until September. As 

 will be seen hereafter, the northern or central part of Iowa was prob- 



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