INSECTS INJURIOUS TO THE POPLAR. Le 
gust and throughout September, and passing the winter in the ¢chirysalis 
state. Itis attacked by several parasites, 7. e., a Microgaster, an Ophion, 
and a Tachina fly. 
The chrysalis is dark shiny brown, and endsin an obtuse point furnished with several 
forked bristles. It is formed within a pale yellow cocoon of silk interwoven with the 
hairs of the caterpillar and is generally spun in some sheltered ules as in a chink in 
the bark of a tree, etc. 
The moth.—Fore wings white-gray near the anal angle between veins 1 and 2, a 
large and conspicuous spot like a Greek letter psi, placed sidewise, and from this spot 
a somewhat zigzag line runs parallel with the posterior border, forming a large dart- 
like spot between veins 5 and 6. (Riley.) 
9. Smerinthus modesta Harris. 
Larva on cottonwood in Illinois. (C. E. Worthington, Can. Ent., x, 16.) 
10. Pemphigus populi-transversus Riley. 
Forming a gall upon the petiole near the base of the leaf of Populus monilifera and 
P. balsamifera. Missouri, Southern Texas, and Colorado. (Riley.) 
11. Pemphigus populi-monilis Riley. 
On the narrow-leaved cottonwood in Colorado. 
12. Pemphigus populi-ramulorum Riley. 
13. Pemphigus pseudobyrsa Walsh. 
Occurs on Populus angulata. (Thomas viii, 151.) 
14. Pemphigus vagabundus Walsh. 
Produces a large irregular gall on the tips of the twigs of certain cottonwoods. 
(Thomas viii, 151.) 
15. Pemphigus populicaulis Fitch. (Le Baron.) 
Also occurs on the aspen (Populus tremuloides) in Wisconsin. (Thomas viii, 149.) 
16. Chaitophorus populicola Thomas. 
Found in July at Carbondale, Ill., and early in September on the under side of 
young sprouts of Populus angulata (cottonwood). 
INSECTS INJURIOUS TO THE POPLAR 
AFFECTING THE TRUNK. 
1. THE POPLAR BORER. 
Saperda calcarata Say. 
Order COLEOPTERA; family CERAMBYCID.®. 
Often destroying the Lombardy poplar, a yellowish-white grub, nearly two inches 
long, and changing to a gray longicorn beetle, irregularly striped with yellow ochre, 
the wing-covers ending in a sharp point, flying in August and September. 
Harris states that this borer, with the grubs of the broad-necked 
Prionus, almost destroyed the Lombardy poplars in his vicinity (Oam- 
bridge, Mass.), and that it also lives in the trunks of the native poplar. 
