G. S. Graham-Smith 
373 
experiment. The remaining three puparia contained dead fly remains. The 
greatest number of the parasites from one puparium was 2 and 11 $. 
In a second experiment six of the chalcids were confined in a tube with 
12 puparia on May 1, 1917. All were dead within 15 days. 29 $ and 102 $ 
Fig. 14. Nasonia brevicornis . X20. 
Fig. 15. Nasonia brevicornis $. X 20. 
emerged within 47 days of the commencement of the experiment. On dissecting 
these puparia 10 chalcid nymphs were found also. 
In a third experiment six females were confined with 12 puparia on 
May 1. Within 30 days 14 $ and 70 $ emerged from six of the puparia. From 
