40 THE PLUM CURCULIO. 
TaBLeE III.—£gg-laying records from 10 plum curculios, College Park, Md., 1902—Con. 
Maximum | Average 
number of | number of 
eggs in eggs laid 
one day. | per day. 
Date of | Days un- | Dayson 
death of | der obser- | which eggs 
beetles. vation. were laid. 
‘To. of individual. pert 
SNR Sea oe Wie ee cee LE oP. Aug. 1] Aug. 2 8 70 15 3.94 
DER ne Nn oe Ca Eee eee June 19 | June 20 38 32 15 7. 34 
BRP ete aN Nee 5. el | oe eee May 22 D1), ack aha! | nae eee eee | 5 ees 
de Se = A eS See Ie SNA Sh eed a se June 18 } June 19 37 36 17 8. 44 
eta eecis = Soe asic Se aeioee te sees Aug. 1] Aug. 2 8 74 18 5. 89 
Gh ene Fee eee June 19 | July 10 58 37 15 7. 30 
(Op a OE een ee PENSE oe May 26 | May 28 15 10 12 6. 20 
Sse ics: So Ae ee cae eemnees May 30] May 31! 19 17 14 8.35 
Ee Rasen AM Aa ecco July 28 | July 81 79 63 19 6. 30 
LOE 25.5 eat bees ere ee July 25 | July 26 74 57 15 6.12 
1 Escaped. 
In Illinois, in 1904, Prof. C. S. Crandall* made many interesting 
observations on 17 female curculios relative to their feeding and egg- 
laying habits. Some of these are shown in Table IV. 
Tasie 1V.—Egg-laying records from 17 plum curculios on apples, Griggsville, Til., 1904. 
Bees mason Maxi- Average 
ate o ays un- : mum | number 
No. of individual. Bees pate oF eae of death of | der ob- e oe number | of eggs 
ke 88. S8-| female. |servation.| _ ©8%S.. | ofeggs | laid per 
were laid. | « 
in 1 day day 
May 25 | July 10} July 24 63 32 9 2. 64 
May 26] Sept. 3 | Sept. 15 115 84 8 2. 80 
doses July 8| July 20 59 37 9 3. 21 
do. July 17 | Sept. 10 111 14 5 paral 
May 30] June 13 | June 16 25 9 2 1. 33 
May 25| Aug. 5 | Sept. 26 127 12 3 1. 50 
May 26 | June 22 | June 23 32 22 4 2. 00 
May 25/] July 11] July 26 65 15 2 1. 26 
May 26 | Aug. 10 | Aug. 30 100 69 9 3. 81 
June 3 | June 25 | June 26 35 22 8 4.45 
May 26 | Aug. 30] Sept. 6 106 78 6 2. 52 
May 26| Aug. 1) Aug. 9 79 59 8 Paral 
May 27 | Aug. 17 | Sept. 1 102 25 3 1. 37 
SACO eee Sept. 9 | Sept. 23 123 87 9 2.90 
May 25] Aug. 4] Aug. 10 80 62 9 4.01 
June 2] July 17} July 23 62 42 8 2. 98 
June 10} July 18 | Aug. 20 87 11 2 1. 27 
The beetles were captured May 23 (one pair May 26) in the act of 
mating and separately confined in jelly glasses, and were kept indoors 
on a laboratory table. Fresh apples were supplied at regular inter- 
vals. Observations were continued until death of female, as shown. 
During the last four or five years numerous egg-laying records have 
been obtained by the Bureau of Entomology in different parts of the 
country. These and other life-history studies for the most part have 
been made under out-of-doors conditions, approaching as closely as 
possible those which obtained in orchards at the time. (See Pl. XII.) 
1Tll. Agr. Exp. Sta., Bul. 98, p. 508. 
