CLOVER STEM-BORER AS AN ALFALFA PEST. Jie 
the month of March and early April, of the proper size and ma- 
turity, beetles, which have come from their hibernation quarters, will 
also oviposit in alfalfa, and a small percentage of them have been 
found ovipositing in the common mallow ( Malva rotundifolia). 
Adults of the first generation are found issuing in early May, the 
earliest date upon which adults have been observed to issue being 
April 26, 1916, by. the junior author. In a week to 10 days after 
issuing, oil again are ovipositing; the second geheration imme- 
diately follows, and by early June larve of this generation are found 
in immense aera in infested alfalfa fields. It is the first genera- 
tion, and the early broods of the second generation that do the largest 
damage to alfalfa, since the third generation usually is parasitized 
quite heavily. Beetles of the second generation begin appear- 
ing any time after the middle of July and start oviposition for the 
third generation which gives rise to beetles early in the fall. It is 
thought that at times this fall generation of beetles also oviposits 
before going into winter quarters, yet it has been impossible to be 
sure of this owing to the fact that later-appearing beetles of the 
second generation have also been known to survive until early Sep- 
tember and continue their oviposition activities until that date. 
The latest date on which eggs have been taken in the field is Sep- 
tember 6, 1916, while pupz have been dissected from field-grown 
alfalfa stems as late as the last week in October. 
It is thus to be noted that there is a considerable intermingling of 
the second and third generations, so that under field conditions 
they are not separate and distinct. Both the parent beetles and 
beetles of a new generation may be found ovipositing in the same field, 
and it was only by careful cage observations that the three distinct 
generations were secured. While indications point toward a possible 
fourth generation, yet this was not conclusively proven to the satis- 
faction of either author. By early November of most years beetles — 
have gone into hibernation and can not be found in the field. 
HIBERNATION. 
These borer beetles have been observed hibernating in almost any 
place where they have sufficient cover to protect them from the 
freezing temperatures of winter. 
C. M. Packard, of the Bureau of Entomology, has found them at 
Hagerstown, Md., hibernating under stones in wheat fields and in 
erass along railroad right of ways. D. J. Caffrey captured two 
aduits at the edge of a wheat stack at Tempe, Ariz., while T. S. 
Wilson, likewise of the bureau, found an adult of this Pebeces in wild 
barley along a fence row. 
The junior author maintained a large winter cage containing 
beetles of the clover stem-borer, and from these cage records it was 
