12 Psyche [February 
example, the thecae of the eyes, legs and wings are discernible, and 
the remains are not much shrunken, so far as the original length 
is concerned. In the case of Cynomyia cadaverina, in one pupa- 
rium infested with 21 larvae of the first spring generation, the 
parasites were all attached to the dorsal surface of the host from the 
pronotum to the tip of the abdomen; these parasitic larvae were nearly 
full-grown. But in another puparium of the same host, in which 13 
larvae were found, their attachment to the host appeared to be hap- 
hazard, and the host pupa was considerably shrunken, especially in 
width. It is evident, from their appearance, and from the fact that 
the larger larvae are found attached externally to the host — between 
it and the inner walls of the puparium — that the larval parasites 
obtain their nourishment through the body wall of the host pupa, 
leaving the integument intact. In both of the latter cases, the host 
pupae were nearing the final ecdysis when they were attacked by the 
parasites. 
Although gregarious, the host is not as completely destroyed as by 
Spalangia, Muscidifurax or Pachycrepoideus, which though solitary 
parasites, reduce the host to a mere flat unrecognizable shell. 
In addition to the foregoing, Mr. Maurice C. Tanquary has kindly 
collated the following records from our rearing notes: 
TasLe I. NUMBER AND SEX OF PARASITES (Nasonia brevicornis) 
ISSUING FROM PUPARIA OF Phormia regina. 
Males Females Larvae. Total. Males. Females. Larvae. Total. 
8 7 15 0 5 5 
3 6 9 0 1 1 
10 4 14 5 0 +) 
5 3 8 9 6 15 
1 13 14 it 6 7 
i 14 6 16 22 
10 17 Pf 0 5 5 
# 6 13 16 5 21 
13 iat 24 0 i 7 
4 9 ils} 2 12 14 
6 15 21 1 4 5 
0 1y/ ly 3 9 12 
15 5 20 3 8 ll 
1 PHI 22 7 12 19 
10 4 14 6 4 10 
4 6 10 1 10 ll 
6 i 13 3 9 12 
