Further Biological Notes on the Colorado Potato Beetle, Leptinotarsa 10-Lineata (Say), including Observations on the Number of Generations and Length of the Period of Oviposition. II, Illinois.*

Abstract

In presenting for publication the results of a third successive year’s observations on the biology of this insect made in the latitude of Urbana, Illinois and supplementing those made in Georgia in 1906 (Girault and Rosenfeld, 1907) and in Ohio in 1907 (Girault, 1908), it becomes necessary to state that little or no progress has been made in regard to the continuity of observation and experiment, so that they should still be classed as desultory. The observations were made in the open or east insectary of this office at Urbana under as normal conditions as possible, but during odd hours and without previous fore-thought or planning and subject to much neglect at a critical time toward the last.