INSECTS INJURIOUS TO THE COTTONWOOD. 145 
34.. Aphis aceris Linn. Occurs on Acer pensylvanica (Fitch). 
35. Lecanium acericola Walsh and Riley. (Amer, Ent. i, 14.) Also on 
box elder (Thomas). 
36. Lecanium acericorticis Fitch. On silver maple, Washington, D. C. 
(Glover, Sm. Rep. 1876. See Thomas vii, 120; American Natur- 
alist, xii, 655, 808.) 
DIPTERA. 
37. Cecidomyia aceris Shimer. On Acer dasycarpum. (Trans. Amer. 
Ent. Soce., i, 281.) 
INSECTS INJURIOUS TO THE COTTONWOOD. 
(Populus monilifera.) 
AFFECTING THE TRUNK AND BRANCHES. 
1. THE POPLAR BORER. 
Saperda calcarata Say. 
Order COLEOPTERA; family CERAMBYCID£. 
_ In the Western States, including Colorado, causing widespread injury and destruc- 
tion to the cottonwood trees. (Riley. See the poplar borer, p. 117.) 
2. Hyperplatys aspersus Say. 
Boring in dry twigs at Columbus, Tex.; the perfect insect to be found throughout 
spring and summer, according to Schwarz. (Riley.) 
3. Oberea schaumii Leconte. 
The larva burrowing in the twigs, making a very smooth cylindrical burrow, the 
perfect insect appearing in the middle of June at Saint Louis, Mo. (Riley.) 
4. Oberea mandarina Fabr. 
The larya boring in the thin twigs at Saint Louis, Mo., the imago issuing in the 
middle of April. (Riley.) 
5. Dorytomus mucidus Say. 
Running on and flying about cottonwood trees early in April and again in August. 
In October it is found under dead bark of trees in winter quarters. Common. IIli- 
nois. (A. 8. McBride. Can. Ent. XII, 106.) 
6. Eros coccinatus Say. 
Found in April in Illinois in the cottonwood, under logs in the woods. (McBride, 
loc. cit.) 
AFFECTING THE LEAVES. 
.7. THE STREAKED COTTONWOOD BEETLE. 
Plagiodera scripta (Fabricius). 
Order COLEOPTERA; family CHRYSOMELID®. 
An abundant beetle, infesting the leaves of the cottonwood and other species of 
Populus and of willows througheut the West to Colorado, and south to Louisiana, 
