40 NEW YORK STATE MUSEUM 



A large, deep, sharply defined dimple, green, orange yellow within, diameter 

 4 to 12 mm, convex toward the upper surf ace. of the leaf, on P. nigra var. 

 italica. Chad. 'o8, p. 137 



Acarid. Eriophyes sp. 

 Oval, somewhat elongate galls with transverse openings occur near the middle 

 of the leaf petioles of Cottonwood, the latter part of the summer. Felt '06b, 

 P- 635 



Aphid. Poplar leaf stem gall, Pemphigus populitrans- 



versus Ril. 

 Globose petiole gall at the base of the leaf and with a transverse mouth. Pack. 

 '90, p. 470 



Aphid. Basal leaf gall, Pemphigus populicaulis Fitch 

 Subglobiilar, distinctly ridged, monothalamous, petiole gall at the base of the 

 leaf, diameter 5 to 7 mm. Fig. 44. Busck '07, p. 98 



Lepid. Ribbed petiole gall, Ectoedemia populella Busck 

 An irregular, large stem and petiole deformation. PI. 16, fig. 3. Chad. '08, 

 p. 138 



Acarid. Eriophyes populi Nal. 

 Oval twig gall, length 3 to 4 cm, diameter 3 cm. Felt and Joutel, '04, p. 368 



Coleop. Saperda populnea Linn.^ 

 Irregular, branch and trunk swellings, mostly on branches or smaller stems, 

 produced by transverse galleries just under the bark. Felt '06b, p. 103 



Coleop. Mottled willow borer, Cryptorhynchus lapathi 



Linn. 

 Irregularly oval swellings on the smaller twigs, length 3 mm. PI. 4, fig. 3. 

 Felt '06b, p. 634 



Dipt. Poplar twig gall fly, Agromyza schineri Giraud 

 Irregular, subconical twig or petiole gall, length i cm 



Itonid. Cecidomyia sp. 

 Oval, white cocoons on twigs. Felt 'i5e, p. 102 



Itonid. Rhabdophaga populi Felt 

 In decaying wood. Felt 'iik, p. 476 



ttonid. Kronomyia populi Felt 



Myricaceae (sweet gale family) 

 Myrica cerifer (wax myrtle) 

 Bud galls. Beutm. 'o7d, p. 306 



Itonid. Itonida myricae Beutm. 



Myrica asplenifolia (sweet fern) 

 Fleshy vein folds, length 2 to 4 mm. Fig. 45. Felt '07a, p. 159 



Itonid. Sweet fern midge, Janetiella asplenifolia Felt 



' Prof. T. D. A. Cockerell has described the gall ofS. lesquereuxi on Populus les- 

 q u e r e u X i from the miocene shales of Florissant, see Proc. U. S. Nat. Mus., no. 2146, p. 105, 1916. 



