322 



JOURNAL OF ECOXOMIC ENTOMOLOGY 



[Vol. 7 



DRY HEAT 



C. orijza. Adults, beetles died at 47° C. to 48° C. 

 S. surinamensis. Adults died at 48° C. to 49° C. 

 Mites T. americanus, were killed by 47° C. 



T. ornatuni. Larvae half grown, adults and pupae. Half grown larvae 

 died at 51° C. to 52° C. Pupae and adults killed by 50° C. 



THE WESTERN CORN ROOT WORM 



By George G. Ainslie, Entomological Assistant 



So many of the pests of orchard and field crops in the north and 

 west have come, by importation and diffusion, from the east and 

 south, it seems but just retribution that at the present time one of 

 the well-established pests of corn in the west, Diabrotica longicornip, 

 the Western corn root worm, is invading the southeast from its original 

 headquarters in Illinois and ]\Iissouri. 



Prof. r. ]VI. Webster has followed this species from the beginning 

 of his entomological work, a period of forty years, and has watched 

 its spread from an area, at first apparently small, in the prairies of 

 Ilhnois until, at the present time, it "occurs from Nova Scotia south- 

 ward to Alabama and Mexico, westward to southern Minnesota 

 and South Dakota and thence south to southern New Mexico." 

 Apparently it has not yet completed its travels, for the writer, within 



