376 BOTANICAL GAZETTE [MAY 
6. Focxeu, H., Recherches anatomiques sur les galles. Soc. d’Editions Sci. 
pp. 162. pls. 12. Paris. 1896 
7. Hovarp, C., Sur quelques zoocecidies de ]’Asie Mineure et du Caucase. 
Marcellia 1: 50-53. 1902 
8. ———,, Les zoocecidies des plantes ipo et du bassin de la Mediter- 
ranee. Vols. 2 and 3. Paris. 1909 and 1 
9. Kuster, E., Die Gallen der Pflanzen. Leipzig. IgIt. 
10. Pathaligieche Pflanzenanatomie. Jena. 1916. 
II. WELLS, B. W., A survey of the zoocecidia on species of Hicoria (Carya) 
caused by parasites belonging to the aged and the Itonindidae 
(Cecidomyiidae). Ohio Jour. Sci. 16:37-57. 
he comparative morphology of the Saks of Celtis occidentalis. 
Ohio Tans. Sci. 14:249-290. 1916. 
I2. 
EXPLANATION OF PLATES XXI, XXII 
Plate XXT 
Rotifera: (1) Notammata Werneckii Ehrenb. on onion 
Copepoda: (1) Harpacticus chelifer Miiller on Rho nid. 
Nematoda: (1) Heterodera radicicola Greef on. ieohaleiiee: (2). Tylen- 
chus devastatrix Kiihn on Trifolium. 
Acarina: (1) Eriophyes sp. on Fraxinus; (2) Eriophyes populi Nal. on 
Populus; (3) Eriophyes sp. on Fagus; Rad Eriophyes sp. (anomalum Cook) on 
Juglans; (5) Eriophyes sp. (querci Garman) on Quercus; (6) Eriophyes 
goniothorax Nal. on Crataegus; (7) Eriophyes sp. on Cephalanthus; (8) Erio- 
phyes sp. (abnormis Garman) on Tilia; (9) Eriophyes sp. on Salix; (10) Erio- 
phyes sp. on Acer. 
Orthoptera: (1) Meconema varium Fabr. on Quercus. 
Neuroptera: (1) Lestes viridis Van der Lind on Fagus 
Thysanoptera: (1) Thrips sp. on Piper; e Thrips sri. (host not given); 
(3) Mesothrips melastomae Zimm. on Melastom 
Coleoptera: (1) Mecas inornata Say on Ponedas S. 
Lepidoptera: (1) Gnorimoschema gallaesolidaginis Riley on Solidago. 
Psyllidae: (1) Psylla crataegi Schrank on Crataegus; (2) Psylla ledi 
Flor. on Ledum; (3) Trioza Kiefferi Giard on Rhamnus; (4) Pachypsylla 
vesiculum Riley on Celtis; (5) Pachypsylla gemma Riley on Celtis; (6) Pachy- 
psylla mamma Riley on Celtis; (7) Pachypsylla asteriscus Riley on Celtis; 
(8) Pachypsylla venusta Riley on Celtis; (9) Trichopsylla Walkeri Forster on 
Rhamnus; (10) Livia maculipennis Fitch on Juncus. 
Aphididae: (1) Myzus ribis L. on Ribes; (2) Pachypappa marsupialis 
Koch on Populus; (3) Pemphigus vagabundus Walsh on Populus; (4) Hamamel- 
istes spinosus Shimer on Hamamelis; (5) Phylloxera conica Shimer on Cary; 
(6) Phylloxera caryaecaulis Fitch on Carya; (7) Chaitophorus 
Koch on Populus 
