16 SEVENTEENTH Report StaTE ENTOMOLOGIST OF MINNESOTA—1918 
LIFE HISTORY 
Aputts. The first adults of Agrilus arcuatus and var. torqua- 
tus were taken July 1, 1916. From that time until July 27 several 
hundred were observed. july 7 to 15 seemed to be the week in which 
they were most abundant. - During this time they were observed 
Fig. 1. An oak leaf eaten by adults of the oak twig girdler. 
feeding and sunning themselves on the leaves. In fact the habits of 
this species were very similar to those of A. bilineatus mentioned by 
(Chapman, with the exception that instead of alighting on the bark to 
sun themselves they invariably alighted on the leaves. Numerous pairs 
were seen mating during the week of their greatest abundance, and on 
July 18, under insectary conditions, a bronze colored male A. arcuatus 
was seen to mate with a copper colored female, A. arcuatus var. tor- 
quatus. 
