110 THE PLUM CURCULIO. 
It will be noted that in the case of each of the five pairs, the num- 
ber of eggs deposited during the day is greater than the number laid 
at night. Of the total of eggs laid (1,291), 654 were laid from 9 a. m. 
to 9 p. m., while 637 were deposited during the balance of the 24 
hours, a difference, however, of only 17. <A total of 2,800 feeding 
punctures is recorded, 1,607 being made at night and 1,193 during 
the day, a difference of 414 in favor of night feeding. 
The data suggest, therefore, that the curculio feeds rather more 
at night than in the day and that egg laying goes on at about an equal 
rate during night and day. 
TIME REQUIRED FOR TRANSFORMATION FROM EGG TO ADULT. 
The length of time spent in the fruit and in the soil has been shown 
separately in Tables XXV to XL. While these data are not entirely 
comparable, as representing different parts of the season and a 
variable number of individuals, nevertheless the final averages, when 
brought together, should give an approximate idea of the time 
required for the complete life cycle of the curculio. The final averages 
of time occupied in the fruit and in the soil as detailed are given in 
Table LVII with time for all stages shown, as determined by adding 
together these two periods. 
Taste LVIL.—Time required for the complete transformations of the plum cureulio 
(combined data from preceding tables). 
| Time spent Time re- 
in fruit (egg] -p; uired for 
Localities. Season. | and larval Tine shee eomalee 
stages com- groun transfor- 
bined). mation. 
Days. Days Days. 
SECC AUG Sb ee Se eae eek as een agdoceserab one 1904 20. 00 28. 24 48. 24 
Youngstown, N. Y., and North East, Pa........---.--- 1905-6 19. 68 31.04 50. 72 
Wraskin corns D) (Cl = 22k ere soe ae cea eee as 1905-1908 15. 52 32.04 47.56 
Miyrtle Gas :J2s-pacme a2 e = 1906 17. 90 25. 15 43.05 
Siloam Springs, Ark 1908 21.74 29.00 50. 74 
Dour#las Michi: 2.555. 5—- 1910 20. 80 36. 41 57. 21 
Barnesville; (Gass. s.5° oie. aoe se eee ee eee eee ee 1910 20. 73 34. 38 54. 38 
PAV OTS Oe seetetor eta ene Pee ee re ee ee ee ees 19. 48 30. 89 50. 27 
Considerable variation is shown between the averages of time spent 
in the fruit, and also between the averages of time spent in the ground, 
for the several localities. The shortest average time in fruit is shown 
by the 1905 Washington records, 15.52 days, and this is most closely 
approximated by the Georgia records a year later, namely, 17.90 days. 
The longest average is from Arkansas, in 1908, with 21.74 days. 
As regards the average time spent in the ground, the Georgia record 
for 1906 is lowest, 25.15 days, and the 1910 Michigan records highest, 
36.41 days, though closely approximated by the Barnesville records 
for 1910 of 34.38 days. 
ee 
