THE PARASITES OF POPILLIA JAPONICA 
41 
toward the lateral margin. The time of oviposition is largely 
during the afternoon. The eggs are white or yellowish white, and 
1 mm. in length. The duration of the stage is from eight to nine 
days. The hatching and feeding of the larvae are similar in all 
respects to those of T. popilliavora. 
The rate and duration of oviposition as determined for this species 
are indicated in Table 3. From this it will be noted that the species 
does not average 1 egg per day during the oviposition period, that 
the maximum number obtained in one day was 3, and that the 
average total per individual was 25. This is markedly lower than 
the records obtained for Tiphia popilliavora. 
Table 3. — Oviposition records of 10 females of Tiphia vernalis 
Female No. 
May 
IS 
20 i 21 
22 j 23 
25 26 | 27 
2S 
20 
30 
31 
i D indicates death of female. 
The period of larval growth from the hatching of the egg to the 
spinning of the cocoon is 24 days, or slightly longer. In this species 
the period of growth is much more constant than in the Japanese 
species, a fact which is no doubt due to the increasing temperature 
of May and June in Chosen, whereas at Koiwai it decreases rapidly 
during August and September. 
The cocoons are like those of the preceding species. Unlike those 
of most Tiphia, however, the larvae transform to pupae in the fall and 
development advances to an almost perfect imago, in which state the 
winter is passed. 
