Wilson-Vickery—List of Aphididae. 
135 
populicola, Cliaitophorus Thomas, 1877. Ill. State Lab. Nat. 
Hist., Bui. 2, p. 10. 
Populus angustifolia, P. halsamifera, P. deltoides, P. deltoides-an- 
giistifolia, P. fremonti, P. monilifera, P. tremuloides, P. tricfio- 
carpa. 
populi-conduplifolius, Thecabius (Cowen), 1895. Hemiptera of 
Colorado, p. 115. Pemphigus. 
Populus halsamifera, P. deltoides, P. monilifera, P. trichocarpa, 
Ranunculus californicus. 
populifoliae, Aphis Fitch, 1851. Kept. Reg. Univ. State N. Y. Cab. 
Nat. Hist., p. 66. 
Populus deltoides, P. fremonti, P. grandidentata. 
populifoliae, Chaitophonis (Oestlund) Davis, 1910. Jour. Econ. 
Ent. Ill, p. 48 9. Davis shows that Oestlund was dealing 
with a new species not A. populifoliae Fitch, (Oestlund), 
1887, Aphididae of Minnesota, p. 38. 
Populus halsamifera, P. grandldentaici, P. tremuloidcs. 
populifolii, Eichochaitophorus Essig, 1912. Pom. Coll. Jour. Ent., 
IV, p. 722, fig. 
Populus trichocarpa. 
populi-globuli, Pemphigus Pitch, 1859. Fifth Rept. Nox. & Ben. 
Insects, N. Y., p. 8 50. 
Populus halsamifera. 
populi-monilis, (Thecabius) Riley, 187 9. Bui. U. S. Geol. & Surv. 
Terr. V, No. 1, p. 13, fig. Pemphigus. 
Populus angustifolia, P. halsamifera, P. deltoides-angustifolia, P. 
fremonti, P. monilifera, P. tremuloidcs, P. trichocarpa. 
populi-rainulorum, Pemphigus Riely, 1879. Bui. U. S. Geol. & 
Geog. Surv. Terr. V, No. 1, p. 16. 
Populus halsamifera, P. deltoides, P. fremonti. 
populi-transversus, Pemphigus Riley, 1879. Bui. U. S. Geol. & 
Geog. Surv. Terr., V. No. 1, p. 15, fig. 
Populus halsamifera, P. deltoides, P. fremonti, P. monilifera, P. 
trichocarpa. 
populi-venae, Pemphigus Fitch, 1859. Fifth Rept. Nox. & Ben. 
Ins., N. Y., p. 851. 
Populus halsamifera. 
