20 PEELmiXAEY EEPOET OX ALFALFA WEEVIL. 



in March and was at its height by the middle of May. and Mr. C. X. 

 Ainshe found eggs in a rearing cage where beetles were confined 

 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 larva? of ah sizes 

 were found rarely in the fields Xovember 1. On this 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 larva? 

 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 

 days. 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 fall and the eggs deposited the following spring. 

 Of course, the scattering eggs and larva? 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. 



EVLDENXE OF A PaETIAL SECOND GeXEEATIOX. 



The occurrence of larva? up to the approach of cold weather in late 

 fall has already been noted. Some of these at least might be 

 counted for from the fact that overwintering females still containing 

 _ js are found throughout July and early August ; but that others of 

 these larva? are the offspring of parents developing during the pre- 

 ceding spring is strongly indicated by the fact that the females 

 depositing eggs from which lam~a° 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 c Iropped at random on stems 



and le; ad 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 Xovember 7 and kept indoors were found to 

 have deposited eggs within 2 or 3 days prior to Xovember 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 the^e late-appearing larvae are the 



