292 



C. T. BRUES. 



developed male pupae. Although hundreds of specimens of 

 Polistes texanus were examined they showed no parasites at any 

 time during the season. 



The following tabular arrangement has been prepared to show 

 some of the more important relations betwen the Polistes and the 

 parasites in two nests of annularis. 



First nest of Polistes annularis ; 86 female wasps, 44 of them parasitized by Xenos 

 nigrescens. An examination of 36 of these revealed parasites as follows : 



In the total of 36 wasps examined there were 91 male and 

 only 3 female parasites. In two cases the females were asso- 

 ciated with males in the same wasp. This great preponderance 

 of males in the nest is very remarkable and may possibly be due 

 to the season of the year (July) since the next nest to be de- 

 scribed contained many more females and was collected much 

 later (October 3). 



Second nest of Polistes inituilaris ; 42 female wasps, 36 of them paras-itized by 

 pa Hid us. 



Total males, Si. Total females, 44. Wasps with females 

 only, 10. Wasps with males only, 8. Wasps with both males 

 and females, 17. Wasps with larvae only, I. 



1 e refers to the number of males which had emerged when the wasp was captured. 



