to THE CANADIAN ENTOMOLOGIST 



engaged in a cabbage patch. Others soon appeared, and before cold 

 weather set in it had become quite abundant and larvae in an advanced 

 stage of growth were found in November. Probably the butterfly crossed 

 the Missouri in the summer of 1880. We are here thirty-five miles west 

 of the river, a distance that could hardly have been traversed in one 

 season. It also appears that the cabbage crop has been almost totally 

 destroyed in the eastern part of Dodge County and farther east, while 

 here a partial crop has been secured notwithstanding the visit of the 

 imported pest, supplemented by an unusual abundance of the Cabbage 

 Plusia. August ist, 1873, when I left my former home in Bureau County, 

 Illinois, rapce had not yet reached that place ; therefore in less than eight 

 years its westward progress upon this parallel has taken it across the State 

 of Iowa and the Mississippi and Missouri Rivers. 



The question naturally arises — Will the insect stop short when it 

 readies the grassy plains of Western Nebraska, or will it press onward to 

 the cabbage gardens of Utah and the Western slope ? By the aid of man 

 it might soon cross the plains, even if it subsisted wholly upon cabbages j 

 but being not averse to other cruciferous plants, it will find its way made 

 easy. A mustard-like plant of this family with pink flowers grows along 

 the embankment of the Union Pacific Railway, nearly if not quite 

 throughout the whole distance from Omaha to Ogden. At Ogden Junc- 

 tion it is the most abundant of wild plants. If this plant furnishes a 

 suitable food, P. rapce will have little difficulty in surmounting all obstacles 

 that bar its progress toward the valley of the Salt Lake. 



G. M. Dodge. 

 Glencoe, Dodge County, Nebraska. 



Exchanges. — I would like very much to effect some exchanges with 

 Entomologists in Canada in Lepidoptera. I have a great quantity of good 

 material in duplicate from our Adirondack region, from the South and 

 West, and from Europe. W. W. Hill, Albany, N. Y. 



Donation. — We desire to return our sincere thanks to Prof J. T. 

 Bell, of Belleville, who has kindly sent to our Society a number of very 

 interesting mounted microscopic objects, including Polycistina and Dia- 

 tomacea from Vancouver Island — a most useful addition to the cabinet of 

 objects in our rooms. 



