46 THE PLUM CURCULIO. 
In Table X is presented the egg-laying record of 18 beetles, as 
obtained by Mr. Hammar, at Douglas, Mich., during 1910. The 
beetles were confined June 7, and the last egg was obtained on July 
24. The period of oviposition is noticeably shorter than in several 
other records presented. 
TaBLE X.—Egg-laying record of 18 plum curculios, Douglas, Mich., 1910. 
Eggs laid each week by each beetle. 
No. of individual. | Total. 
June June June June July July July 
7-13. 14-20. 21-27. |28-July 4.) 5-11. 12-18. 19-26. 
Lee Acree ee 14 23 29 VG No. comes eal cee elseeeiaa| ieee eieee 81 
PE ne ee ae 17 29 35 60 47 1 Ye eee ee, Sot 201 
Racks aan eee Sas 11 27, 13 Gilekinssseees| nee e soeesleeceeeeeee 57 
( legen Snot a Be hale te 4 13 22 24 8 Be ee ines 74 
Le Sa a te te te 6 9 3 11 15 37 9 90 
Gee cca Ree Ree See Boe cre ic 9 37 16 62 
Te Dic ane EU BR INW BSCE 21 13 23 85 
Soe oe eae, eee | 9 16 6 18 64 
eS oO i A A 4 23 32 36 112 
1 pees A eae See ee 7 21 10 24 110 
Thee a Di bak clot 18 26 34 83 
IO 25 ot SAA eo eae Pa eee aoe 19 20 18 57 
UG 3 SS eh eh ene eine Prretear te 22 Sy ebro eS 25 
TIC 0 ot em aaa a ele 9 Diy ae eee on 
lipigmdtl Ss Se Reeeeeen eet oc ae SoS tose Scare ome 12 19 31 
53 92 pe RRR te RTE Ue PELE EA 19 58 83 
[1 coh WAM RA leee Pee Dna |S oA ne ae 8 12 26 
ic ail RA OPN ae eR MEISE IE 302 EEN | 29 49 148 
Totalese- tse | 72 259 329 423 229 89 13 1,414 
| | 
Maximum | Average 
| Date of | Days un- | Days on 8 
No. of individual. nae death of | der obser- | which eggs | 2U™ber of | number of 
88 laid. | beetles. | vation. | were laid. |°88S12 One) eges per 
day. day. 
ea aoe Snare ork co June 29 {Any 15 alt 16 rH 5.06 
DP fee tase Sal daa esos ea enaaes July 13 | July 18 41 34 i 5. 91 
y 76 
oo | 14 10 4.07 
3 22 i 3. 36 
52 26 10 3. 46 
28 15 10 4.13 
0 28 6 3.03 
55 21 6 3. 05 
55 22 11 5 09 
0 29 9 3. 79 
29 16 10 5.19 
26 13 10 4. 38 
54 5 9 5. 00 
41 9 4 2.78 
0 9 4 3. 44 
29 12 18 6. 92 
36 10 4 2. 60 
35 
eal 19 14 7.79 
1 Escaped. 
