364 THE CANADIAN ENTOMOLOGIST, 



men black, second and most of the third segment reddish yellow, or in 

 one paratype the second and third segments red, the apex of each black 

 in the middle. 



Habitat — Washington ; Moscow, Idaho (Prof. J. M. Aldrich). Type 

 and one paratype in the collection of the American Entomological Society 

 and one i)aratype in the colleciion of Cornell University. 



I dedicate this species by permission to Rev. Fr. W. Konow, whose 

 work on the Phytophagous Hymenoptera stands alone. 



A REMARKABLE FLIGHT OF CORISA, "WATER BOATMEN." 



BY D. LAKGE, ST. PAUL, MINN. 



Between 2 and 3 o'clock on the afternoon of Oct. 11, 1904, I 

 observed a remarkable flight of " Water Boatmen " at St. Paul, Minn. 

 Thousands of them were flying hither and tliither over several asphalt- 

 paved streets, which had just been watered, and on which the sun was 

 shining; the temperature was about 60' F. in the shade, the sky was clear, 

 and there was no wind. The insects evidently mistook the wet asphalt 

 for water. Thousands of them alighted, and were held fast by the film of 

 mud until they died. About 5 o'clock I noticed on one street a struggling 

 " Boatman " to every square inch of surface. 



Have these insects regular autumn swarming days like ants, or do 

 they migrate from one body of water to another in search of favourable 

 winter quarters? The lakes and ponds about the city were full of water, 

 and therefore this general flight was not caused by any scarcity of the 

 element. Prof. F. L. Washburn, who identified the insects for me, found 

 that there were ten to twenty males to one female, and I did not see any 

 of them mating. These insects are frequently attracted to the electric 

 lamps at night, but I never before found them flying in the daytime. 



A {^'■N individuals of Corisa and a number of " Whirligig beetles " 

 were flying here during the afternoon of Oct. 28, the weather being fine 

 and the temperature about 55°. 



The Annual Meeting of the Entomological Society of Ontario will 

 be held at the Ontario Agricultural College, Guelph, on Wednesday and 

 Thursday, Occ. 18 and 19. 



Mailed September 30th, 1905. 



