278 
The Ohio Naturalist. 
[Vol. II, No. 7 . 
descriptions of several species inhabiting the Oak Galls of Illinois. ’ ’ 
Proc. Ent. Soc. of Phil. Vol. II. No. 4. pp. 443-500. 
22. Walsh, B. D. “On Insects, Coleopterous, Hyinenop- 
terous, and Dipterous, inhabiting the Galls of certain species of 
Willows.” Proc. Ent. Soc. of Phil. Vol. III. pp. 543-644; 
id. Vol. VI. pp. 223-288. 
1111. — nutritive zone, 
o. e. — outer epidermis, 
p. — protective zone, 
pa. — parenchyma. 
EXPLANATION OF PLATES. 
In making the drawings, a Bausch and Eomb microscope and 
camera lueida were used. Figs. 1-7 were made with i-incli ocular 
and 1-5-inch objective. The diagrams of the galls were not made 
upon a definite scale. All other drawings were made with i-inch 
ocular and ^3-inch objective. 
Abbreviations : e. — epidermis. 
end. — endodermis. 
f. — fibro-vascular bundle. 
1. c. — larval chamber. 
Cross section of leaf of Hicoria ovata. 
“ “ Salix cordata. 
“ “ Vitis vulpina. 
“ “ Ulmus americana. 
“ “ Acer saccharinum. 
“ “ Tilia americana. 
“ “ Ouercus alba. 
Phytoptus ulmi on Ulmus americana. 
“ abnormis on Tilia americana. 
“ quadripes 011 Acer saccharinum. 
“ acericola “ “ 
12. Schizoneura americana on Ulmus americana. 
13. a. b. Colopha ulmicola on Ulmus americana. 
14. a. b. Pemphigus ulmi-fusus on Ulmus americana. 
15. a. b. Hormapiiis Ilamamelis on Hamamelis virginiana. 
16. a. b. Phylloxera carya-avena 011 Plicoria ovata. 
1. 
2. 
3 - 
4 - 
5 - 
6 . 
7 - 
8 . 
b. 
b. 
a. 
9. a. 
10. a. b. 
11. a. b. 
17. a. b. c. 
18. a. b. c. 
19. a. b. 
20. a. b. 
21. a. b. 
22. a. b. c. d. 
23. a. b. 
24. a. b. 
fallax 
“ globuli “ “ 
“ spinosa “ “ 
“ depressa “ 
vastatrix on Vitis vulpina. 
Cecidomyia gleditsiae on Gleditscliia triacanthos. 
“ pilulae 011 Ouercus alba. 
“ verrucola on Tilia americana. 
25. a. b. Neuroterus irregularis on Quercus macrocarpa. 
alba, 
palustris. 
rubra, 
palustris. 
.sp. _ 
Longitudinal section of Cecidomyia Solidaginis 011 Solidago. 
“ “ “ salicis-strobiloides on Salix cordata. 
Callirhytis clavula on Quercus alba. 
a. Longitudinal section. 
b. Cross section. 
c. “ “ of leaf from b. 
d. “ “ of larval chamber from b. 
Note : — P. vastatrix was also collected on V. bicolor; C. pilulae was also 
collected on O. rubra and O. palustris. 
2i. a. b. Callirhytis tumifica 
27. a. b. c. Holcaspis centricola 
28. a. b. Amphibolips inanis 
29. a. b. c. Dryophanta palustris 
30. a. b. c. Callirhytis papillatus 
31. 
32 . 
33 - 
