LIFE HISTORY AND HABITS: THE EGG. 51 
The shortest period, 2 days 18.5 hours, April 9 to 12, was closely 
approximated later in the season, June 7. The longest period, 6 
days 21.5 hours, occurred April 15 to 22. The average egg period 
for the entire series is 4.44 days. 
In Table XIV are given records of 113 eggs, observed in 1907 at 
New Richmond, Ohio, on different dates during May and June. 
The longest egg period was about 6} days, on May 18, and the 
shortest 3 days and 5 hours, on June 20. The average egg period 
for all lots is 4.92 days. 
TaBLE XIV.—Length of egg stage of the plum curculio, New Richmond, Ohio, 1907. 
= Average 
Eggs under Approxi- 
observa | g2pite.of, mate engin) Total eee | length of 
tion. of egg stage. by aionitel 
Days. Days. 
39 | May 18....] 6. 25 243.75 | 
31 | May 23.... 5.00 155.00 | 
OP Sem crecne ems See 398. 75 5. 69 
23) |e ive 4.00 92. 00 
20 | June 22.... 3220 65. 00 
2 SY ot eas eo Soe ace eet 157. 00 3. 65 
rita SrIPLEREDEO Nepean as tes a Sas se ee sale eee Sao eG aeons ca edaoeekeee sees cee eels 
CP RPDNQHE CENTS - 0 Eso DoE ce dient se es a ey See ec eee sa eS Ae 555. 75 
WERT IGT GEE UG tO 2 Fc eee eR i ee 4.92 
Data were secured on the egg period at Siloam Springs, Ark., 
during late summer from August 15 to 25, the time varying from 
35 to 6 days, the average of the 18 eggs for the period being 4.66 days. 
Some egg records made under out-of-doors conditions in the 
insectary yard, at Washington, 1908, are given in Table XV. The 
period included from May 7 to 22 was marked by abnormally low 
temperature, and its effect upon egg development is clearly shown. 
TaBLe XV.—Length of egg stage of the plum curculio, Washington, D. C., 1908. 
Eggs under Approxi- 
observa- Ae aes mate length ee Eee 
tion. P “lof egg stage. eAise 
Days. 
So | Mayatc-es- 11.00 33. 00 
1 Osea 25- 10. 7. 10. 75 
4 May 8..... 9. 75 39. 00 
5 down 10. 00 50. 00 
3 May 8-9. 9.50 28. 50 
Ly |22-G0..--<<2 9.75 9. 75 
2 BEC: (PEA AAne 10. 50 21.00 
1 10.7 10.75 
5 | May 9-10 8.75 43.75 
3 SR Oss sare 9. 50 28. 50 
7 | May 10-11 8.50 59. 50 
1 2.00: s. 3% 8.75 8.75 
1 | May 11.. 8. 25 8. 25 
3 | May 13°... 8.00 24. 00 
3 | May i3-14 8.00 24. 00 
1 | May 14 8.00 8. 00 
1 edOtesesn 7.75 7.75 
F yal ip eer nal a 2 415. 25 
HRI OLOLOE PN ere 5A 5 deck ooo d A ae ee Se ae NG spose kw ee ASA eer eee 45 
uD RE GnWi) weighs ee eee re Se eee Se 6 0 ae ee AS ci gee OS Ee 415.25 
“SFE T OT aA OGRE EC ee eee ees CN eS ee ee ae days.. 9.23 
