276 
Psyche 
[September 
of them (1927) as a single group, Odynerus s. L, was quite 
permissible. The numbers for Monobia and Montezumia are 
again very low but seem to indicate agreement with the 
condition found in Odynerus. The figures for Belonogaster 
suggest preference of both sexes for the fourth segment. 
The parasites of Vespa apparently agree with those of 
Polistes, the males lying anteriorly to the females. We have, 
then, the Eumeninse forming one group, Polistes and Vespa 
another ; the difference being clearly shown in the totals, as 
follows : 
Under abdominal segment number 
2 
3 
U 
5 
6 
Eumeninse £ parasites 
— 
9 
43 
13 
— 
$ parasites 
4 
59 
35 
— 
— 
Polistes and Vespa $ parasites 
5 
26 
30 
5 
1 
$ parasites 
— 
3 
3 
18 
1 
Since, in the Vespidse, the males have seven, the females 
only six visible abdominal segments, we have examined our 
records to see whether the sex of the host has any effect 
on the position of the parasite. Summarizing our records 
for the two groups shown above, we have the following : 
Under abdominal segment number 
Eumeninse 
2 
3 
U 
5 
6 
males .... 
£ parasites 
— 
4 
22 
6* 
— 
$ parasites 
2 
23 
12 
— 
— 
females .... 
$ parasites 
— 
5 
20 
7 
— 
$ parasites 
2 
33 
22 
— 
— 
Polistes and Vespa 
males .... 
$ parasites 
1 
5 
9 
2 
1 
9 parasites 
— 
2 
— 
2 
1 
females .... 
$ parasites 
4 
21 
21 
3 
— 
$ parasites 
— 
1 
3 
15 
— 
The $ and $ Xenos found under the sixth abdominal 
segment of a male Polistes could not have extruded under 
this segment, of course, in a female host. With this excep- 
