THE CALIFORNIA PEACH BORER. 69 
insectary, and to note the development of the eggs. (See. Pl. IX.) 
Oviposition under these conditions was more or less unnatural, but the 
eggs thus placed developed under perfectly normal conditions. The 
period from oviposition to the time of hatching, as indicated in 
Table I, lasted from 11 to 19 days, with an average of 14 days. There 
were several hundred eggs in each lot. 
TasLe 1.—Length of egg stage of the California peach borer (Sanninoidea ovalescens). 
Lot No. | Date eggs placed. | Date eggs hatched. eee E: 
| 
le ake WitayaBaObea os 8 She uly 2 28e4 ss. 19 
Oe SPs sc Uy PUB Se eee oe Pulyesbs 22 se 13 
Sehesons Juillye20 Fee. oe ae AID ae aie clases 14 
4 ces Julyp2la ee oe scene AN gil Age he 11 to 14 
Qosccce sl Gesee do! Sa-ee ase ANTON SO ees eo 13 to 15 
epee Abt hao oy eee UNDER (ieee eaten a 14 to 15 
In escaping, the larva breaks a circular hole through the micropyie 
or depressed end of the egg and leaves the eggshell attached to the 
tree. The eggshell remains thus attached throughout the summer 
and fall until early winter rains dissolve the glue by which they are 
attached. 
FERTILITY. 
Many eggs gathered from different rearing cages in our numerous 
experiments were noted to determine what proportion was fertile, 
with the results shown in Table IT. 
Tasie II.—Proportion of fertile eggs of the California peach borer. 
Fertile | Sterile | Fertile | Sterile 
Lot No. eggs | eggs not | Total. || Lot No. eggs not | Total. 
eggs 
hatched. | hatched. | hatched. | hatched. 
| | 
i). 2 eS dae eee 43 | 3 AGH Outer ee See 8 196 3 199 
2 eS See eee 42 42 SEU Ol ee annie La Lees 55 0 55 
2. Le eee 75 | 3 Sal |RIOS 2: Nene Seek S58 292 3 205 
ilee Sos enh ea e aee 139 | 15 154 || 
Sy ee es | 71 | 3 74 || Motale ses se se 1,225 116 | 1,342 
Joe See Gees Ae ee 204 | 44 | ZABy} PE eCreenbag el es see eee 91. 28 8. 72 | 100 
Uncen ae a eee | 198 Oe OSa | 
THE LARYA. 
FEEDING HABITS OF NEWLY HATCHED LARV#. 
The newly hatched larve (fig. 22, a) are extremely active and 
move about freely and they may crawl for a considerable distance 
from the egg. After hatching they immediately seek out protected 
places, either by hiding in cracks of the bark or under particles of 
dirt or loose bark, or they go below the surface of the ground and 
then at once begin to enter the tree. 
Newly hatched larve were closely observed many times as they 
entered the bark. We were never able to watch newly hatched 
71419°—Bull. 97—12——6 
