62 
abdominal segment. The egg is rather securely glued to the 
grub, parasitized specimens of which were eke brought in 
from the field, and also grubs which showed, in the brown “blotch 
behind the posterior coxae, that they had rubbed off the parasite’s 
egg. Nothing very definite is known concerning the duration of 
the early stages of this w asp. At most, it probably has not more 
than two or three generations a year, for while the summer life- 
cycle in three instances was found to be 44, 51 and 60 days, re- 
spectively, it is very much longer for the rest of the year. We 
have a record of T. lucida remaining in the cocoon stage for 
over twelve months. 
The 7iphia larva adheres rather firmly across the base of the 
thorax of its prey, and when it sheds its skin, this shrivels up 
into a pad beneath it. The last stage of growth is rapid, so that 
the Adoretus grub soon perishes. ‘The wasp lays fairly well in 
captivity, as the following breeding record at Los Banos for 1916 
shows: 

Average No. 

co} enna Mee ee Roe ee 
No. Tiphia | Average No. Adoretus grubs | Average No. 
used days each kept oiven | eggs laid 
5 | 
62 | 11.27 21.4 | 13.8 

The best layers of this lot, which also lived the longest and 
were given the largest number of grubs, were as follows 




| 
Tiphia | No. days lived | No. grubs given | No. eggs laid 
| 
| 
INO 48 Omri crate 32 wit 47 
INGOs pil nome peso 3 97 58 
IN OS 2 rarest ece as 23 59 47 
INO REC Solas a eiciees cea 28 Ct 55 
INGORE DOs verte ee 27 81 53 
NON OA eerie ste sest 27 72 47 

The parasitized grubs were, on account of their activity, placed 
in soil-filled jars or tins and not in clay cells. This apples for 
all the 7iphia. 
This wasp passes the winter months in the cocoon stage, and 
we have found that at least in the cocoons shipped to the Ha- 
waiian Islands this stage may be very much protracted. Thus, of 
cocoons sent from Los Banos during March, 1916, the last to 
