158 Psyche [August 
B. Emergence of the Adult. When perfect and mature, having 
cast the pupal integument and rested, the adult parasite in order to 
obtain its freedom cuts a single rounded hole, measuring from 0.60 
to 1.25 mm. diameter, through the puparium with its mandibles. 
This exit-hole varies in position but is usually cephalad or caudad 
and in the dorsal aspect. Its edges are ragged or serrated. It does 
not vary for sex or host and is not unusual. In rare cases the 
parasite may make as many as four exit-holes, obviously because of 
its failure to accomplish its exit readily, as is normal. So far we 
know of no characteristics distinguishing the exit-holes of this 
parasite from those of Spalangia or Pachycrepoideus. 
In regard to the time of emergence. The two sexes appear almost 
simultaneously, but our rearing records indicate an earlier appear- 
ance of the male as is usual. This sex, in a cycle lot of the same 
age, may appear from 24 to 36 hours earlier than the females, but 
not all together, the time given referring to the individuals of earliest 
appearance. The tendency in development is for a more rapid 
maturity of the males, taking the sex as a whole. 
C. Oviposition; Number of Eggs Deposited. 'The facts concern- 
ing this habit are not well known and our observations are briefly 
stated. In one of the two cases observed, the host being Musca do- 
mestica Linneus, the position of the female was essentially the same 
as with Nasonia brevicornis Ashm.; the ovipositor was inserted into 
one end of the host dorsad and 90 seconds were occupied in inserting 
or boring the ovipositor into the host, and the ovipositor was fully 
inserted for 105 seconds. In the other case observed (September 
9, 1908), the female stood lengthwise along the domestica puparium, 
along the median line dorsad, and inserted the ovipositor between 
two caudal segments; the antenne and abdomen were moved slightly 
during the operation which lasted for seven minutes (6.15 a. m.); 
subsequently during the same day, this same female was observed 
making (apparent) oviposition into the same host, so that, though 
solitary, several ovipositions into single hosts may occur (confine- 
ment). As already stated, occasionally (rarely) the female may 
deposit into maggots, apparently when young, but it.is a question 
how this occurs or under what conditions it could be accomplished. 
Regarding the number of eggs deposited. But two observations 
of worth were made concerning this, as recorded on a previous page 
(experiment II.). Here two pairs of adults were given access to a 
