154 Psyche [August 
at all adverse to ovipositing in confinement, as in the case of Spalan- 
gia and many other Chaleidoidea. But seemingly it is not as prolific 
and as general a parasite as is Nasonia. 
We have not obtained positive data concerning the entire seasonal 
history of this parasite, but our observations indicate that it confines 
itself principally to the puparium stage of the house fly, following 
this single host throughout and hibernating in the host puparium as 
a larva, pupating and emerging early in the spring in time to attack 
the first host generation. The investigations concerning the house 
fly, and during which this parasite was discovered, did not com- 
mence until late in July, and the parasite did not appear, so far as 
we know, until the first week in September. From then on, until 
freezing weather commenced, it was comparatively common. It 
was reared from host puparia collected on September 23; and again, 
nearly a month later, from hosts collected on October 21, from a 
garbage heap then literally swarming with muscid maggots (Musca, 
Chrysomyia, Phormia); and from this last lot of puparia a few 
adults of the parasite had emerged by November 6. On October 21 
hibernation had probably commenced, for although adult Spalangia 
were found to be rather numerous in the soil around the muscid 
puparia at the garbage heap, neither raptor nor Nasonia brevicornis 
were seen. Further, hosts collected on November 14, 1908, from the 
same garbage heap, then covered with snow, when confined in the 
warm insectary, produced both adult raptor and Nasonia brevi- 
cornis which emerged about a month later, their development having 
evidently been hastened by the warmth. Facts such as these, 
strongly indicate hibernation in the host puparia and analogy would 
lead to the belief that this species has a winter history somewhat 
similar to that found in Nasonia brevicornis. 
As briefly as possible, we summarize the few special experiments 
conducted with this parasite in the laboratory. 
I. An adult female captured in the insectary around fly-breeding 
cages, September 13, was at once confined in a vial with a single 
puparium of Phormia regina; oviposition was observed within the 
next 24 hours, after which the parasite was released. No emer- 
gences followed. However, the host was examined in March, 1909, 
and found to contain fragments of the host pupa, the dead larva of 
this parasite, its body blackened but still soft up to May 20 follow- 
