22 Psyche [February 
ing in confinement as puparia, revealed the fact that the majority 
had died and that no further parasitism had occurred. After inaugura- 
tion of the experiment, weekly collections of the host puparia were 
made from the heap of garbage and continued until the first week of 
November. ‘The lot collected on September 30 had one puparium 
infested with brevicornis but from these collected thereafter no results 
were obtained, the collections unfortunately being placed in the warm 
insectary and subsequently neglected. Nor were any adults of the 
parasite seen during the visits to the heap in the late fall and early 
winter. From a lot of hosts collected on November 14, however, the 
garbage then being covered with snow, sometime during late Novem- 
ber single females of brevicornis issued from a puparium of Chrysomyia 
macellaria and from one of Phormia regina; these were evidently 
greatly accelerated in development by the warmth of the insectary 
and would otherwise have hibernated within the puparia of the hosts. 
The remaining lots were examined early in the spring of 1909, but 
everything was dead and no indications of parasitism were found. 
L. Hibernation. This parasite hibernates as a full-grown larva 
in the puparia of its various hosts, pupating early in the spring and 
emerging shortly afterwards, the earliest record being April 28, 1909 — 
in numbers the following day. The following data have been gathered 
concerning this phase in its life-cycle. 
Case I. On April 28, 1909, a single broken puparium of Chrysomyia 
macellaria was found in a vial in the cold insectary which had evidently 
been laid aside late in the previous October and subsequently over- 
looked. ‘The vial had no data connected with it, so that the origin 
of the single host could not be traced. With the broken puparium 
were found a living male adult, partly excluded from the pupal in- 
tegument and four healthy pupae of the parasite, two of which were 
uniformly deep black, showing the nearness of the final ecdysis; the 
other two were creamy white in color. The five meconia appeared to 
be freshly deposited. On the following day, by 9: 30 A. M., a female 
had emerged and shortly afterwards (9: 52) was observed mating with 
the male; at 10: 30 A. M., another female emerged. ‘The two remain- 
ing pupae died. 
Case II. A puparium of Phormia regina (Meigen) taken from 
refuse matter was inclosed in a vial on October 1, after having been 
carefully broken open in order to ascertain the presence of parasites; 
six apparently full-grown larvae of the parasite were found within. 
