134 
The Ohio Naturalist. 
[Vol. IV, No. 6, 
34. Eckstein, Dr. Karl. “ Pflanzengallen und Gallenthiere.” 
35. Fockeu, H. “ Etude sur Quelques Galles.” Paris, 1897. 
36. Heim, Dr. F. “Observations sur les Galles produites 
sur Salix babylonica par Nematus salicis.’’ 1893. 
37. Kessler, Dr. H. F. “ Die Entwicklungs und Lebens- 
geschichte der Gallwespe C5Uiips calicis Brgst. und der von 
denselben an den weiblichen Bluthen von Quercus pedunculata 
Ehrh. horvorgerufenen Gallon, Knoppern genannt.’’ Cassel, 
1897. 
38. Lacaze-Duthiers, M. Recherches pour servir a L’His- 
toire des Galles.’’ Extrait des Annals des Sciences Naturelles, 
Tome XXIX. 
39. Molliard, Marin. “ Recherches sur les Cecidies Florales.’’ 
1895- 
40. Nabias, Dr. B. “ Les Galles et leurs Habitants.’’ Paris, 
1886. 
41. Tschirch, A. “ L^eber durch Astegopterj^x, eine neue 
Aphidengattung, erzeugte Zoo-cecidien auf Styrax Benzoin 
Dryan.’’ Deutschen Botanischen Gesell-schaft. 1890, Band 
VHI, Heft 2. 
42. Rubsaamen, Ew. H. “ Uber Zoocecidien von der Balkan- 
Halbinsel.’’ 
43. Paszlavszkjq Jozsef. “A Rozagubacks Fejlodeserol.’’ 
Ternieszetrajzi Fuzetek, Vol. V, Parte II-IV. Budapest, 1882. 
44. Paszlavszk)’, Jozsef. “ Beitrage zur Biologie der Cjmipi- 
den.’’ Wiener Entomologische Zeitung II. 1883, Heft 6. 
45. Prilleieux, M. Ed. “ Etude sur la Formation et le Devel- 
opment de Ouelques Galles.’’ 
46. Pierre, M. I’abbe. “ La Mercuriale et ses Galles.’’ 
Extrait de la Revue scientifique du Bourbonnais et du Centre de 
la France, Juin, 1897. 
EXPLANATION OF PLATES IX-XII. 
The drawings were made with a Bausch & Lomb microscope. For Figs. 
70-76 and Figs. 84-91 and Fig. 93b, a Number 2 ocular and objective. 
For Figs. 77-83, a Number 2 ocular and A immersion objective. With 
Figs. 92-98 and Figs. io6a, no and in, a ^ ocular and % objective. F'or 
Pig- 93 3 Number 2 ocular and ^ objective. The reduction is not so great 
as in the preceding parts and therefore the figures are proportionately 
slightly larger. The diagrams were not made upon a definite scale. The 
numbering of the drawings is continuous with the preceding parts. 
Abbreviations : e. epidermis. mi. — nutritive zone. 
ep. — epidermal zone. f. v. b. — fibro-vascular bundles, 
pa. — parenchyma zone. 1. c. — larval chambers, 
p. “protective zone. sc. — sclerenchyma. 
FLOWER AND FRUIT GALLS. 
70. Section of leaf of Euphorbia corollata. 
71a. Diagram of section of Phytoptus sp gall on leaf of E. corollata. 
71b. Section of 71a. 
72a. Section of lower part of ovary of E. corollata affected by Phytoptus .sp . 
