34 
II 
Fig. 35. Poplar Borer, Memythrus Iricinctus, 
adult female. About twice natural size. 
A third species, allied to the two above mentioned, but more 
commonly found infesting ninebark {Opidastcr opulifolius), has 
been once bred by us from poplar at Chicago. 
Pig. 36 Poplar Borer, Memythnts dollii, adult. About 
twice natural size. 
A Viburnum Borer 
iScsia pictipcs G. & R.) 
A boring caterpillar, somewhat larger than that described from 
ninebark and dogwood, but otherwise extremely similai", has been 
found doing considerable damage to viburnum shrubs in all the 
parks of Chicago, and, in one case, to wild black cherry at Riverside. 
It burrows beneath the bai'k, frequently killing the branches. It 
spends the winter in the larval stage, and has emerged in our breed- 
ing cages during the latter part of June, from the twentieth to the 
twenty-fourth. Elsewhere it is reported to emerge during June and 
July. The species is known also from plum, cherry, beach-plum, 
peach, Juneberry, and chestnut, and has been bred from the black- 
knot of the plum. 
The placing of the eggs has not been noticed by us. but another 
observer, Dr. Bailey, found a cluster of them, ninety-two in number, 
