20 PEELIMINAEY EEPOKT ON ALFALFA WEEVIL. 
in March and was at its height by the middle of May, and Mr. C. N. 
Ainshe found eggs in a rearing cage where beetles were confuied 
indoors as late as October 22, and others found them as late as Novem- 
ber 10, and Mr. E. J. Vosler on December 6, while larvae of aU sizes 
were found rarely in the fields November 1. On tliis latter date the 
sexes were pairing in the fields and some of the females contained 
apparently mature eggs, but none could be found deposited in the 
fields. In 1911 Mr. Urbahns found eggs and very young larvae 
March 31, and adults active in the field on a warm day (January 
31, 1912) ; one feeding and one pair mating. 
The time required for the eggs to hatch after being deposited is, 
according to Mr. Titus, from 7 to 16 days, as observed by Mr. Ainslie 
about 10 days, and according to Mr. Parks's observations about 13 
da,ys. The three series of observations were made during different 
years, 1909, 1910, and 1911, and, of course, under different tempera- 
ture conditions. It would seem as though more or less pairing 
is done in very late f aU and the eggs deposited the foUowing spring. 
Of course, the scattering eggs and larvae found throughout the late 
summer and fall have little economic importance except to indicate 
what might be expected in more southern localities, although even 
in Utah some eggs probably survive the winter. 
Evidence of a Partial Second Generation. 
The occurrence of larvae up to the approach of cold weather in late 
fall has already been noted. Some of these at least might be ac- 
coiyited for from the fact that overwintering females still containing 
eggs are found throughout July and early August ; but that others of 
these larvae are the offspring of parents developing during the pre- 
ceding spring is strongly indicated by the fact that the females 
depositing eggs from which larvae afterwards hatch are in perfect 
condition, unrubbed, and apparently fresh. 
Under date of October 19, 1910, Mr. Ainslie found that eggs were 
being deposited in his rearing cages, dropped at random on stems 
and leaves and even on the sides of the cage, but in no case did he 
observe them placed within the stem. There were in this cage 150 
adults, some of which were undeniably trim and fresh as though they 
had just emerged, while others were pretty well worn, and there were 
all intervening gradations. Adult females swept from alfalfa No- 
vember 2 were found to have oviposited two days later. Adults 
taken from the fields November 7 and kept indoors were found to 
have deposited eggs within 2 or 3 days prior to November 30. 
During the season of 1911 it was possible still further to substan- 
tiate the foregoing by an extensive series of observations carried on 
by several of those engaged in the investigation, and besides to add 
even more evidence that some of these late-appearing larvae are the 
