14 Psyche [February 
The puparia from which the foregoing records were made were 
selected at random from a large quantity formed by maggots obtained 
August 28, 1908, in the decomposed cadaver of a large angora cat, 
taken from the city dumping-grounds, Champaign, Illinois. Each 
puparium was confined separately in a gelatine capsule, until the 
parasites emerged; they were confined’ on Sept. 15, and on Sept. 29 
the majority of the parasites had emerged; the count was not made, 
however, until nearly a month later, or on Oct. 19, 1908. 
In 119 puparia there were 1496 individuals of Nasonia brevicornis, 
of which 710 were males and 786 females. The average number of 
males in each puparium was 5.96, of females 6.60; the average number 
of specimens from each puparium was 12.57. Of the whole number, 
52.4% were females and 47.6% males. ‘The averages do not include 
8 larvae found in two of the hosts. 
On the date of counting — October 19th — 8 of the puparia were 
found to contain larvae of the parasite, some in addition to the adults, 
over half of the larvae being still alive; but 14 of the puparia contained 
only dead pupae of the host, that is to say, were not parasitized. So 
that of the 140 puparia examined, 14 were not parasitized, 126 were. 
The total number of parasites in the 126 parasitized puparia, includ- 
ing larvae, was 1555, and on this basis, the average for each host was 
12.34, very near the former average. The maximum number of 
parasites obtained from a single host (Phormia regina) was 47, 
recorded in the first paragraph of this section; the minimum was 1, 
recorded in the table. 
The meconial discharges of this parasite, found scattered through 
the host puparium, are brownish yellow or dark olive green in color 
and consist of small conglomerations of round pellets, or are some- 
times in irregular chains like some bacteria, but are never single, solid 
pieces as with Pachycrepoideus, Spalangia and Muscidifurax. 
C. Length of the Period of Oviposition. In the cases of two females 
captured and confined together with eight puparia of Musca domestica 
at 11:30 A. M., Sept. 10, the first oviposition was observed at 1 P. M., 
Sept. 10, the second at 7:30 A. M., the following day, the third at 10 
A. M., Sept. 14, and the fourth and last, fifteen minutes later; here, 
at least, oviposition was continued over a period of 34 days or more. 
In the case of 9 males and 20 females, parents of the first spring 
generation of 1909, which were confined at 11:20 A. M., April 29, 
1909, with 10 healthy puparia of Cynomyia cadaverina which were 
