April, 1904.] Galls and Insects Producing Them. 
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72b. Section of upper part of flower of E. corollata affected by Phytoptus sp . 
73a. Diagram of cross section of Cecidomyid bud gall on Solidago canadense. 
73b. Section of same. 
74a. Diagram of longitudinal section of Cecidomyid gall on Ratibida pinnata. 
74b. Diagram of longitudinal section of Cecidomyid gall on Ratibida pinnata. 
74c. Section of 74b. 
75a. Section of unaffected fruit of Prunus virginiana. 
75b. Section of Cecidomyid gall developed in fruit of P. virginiana. 
ROOT GALL. 
76a. Section of young gall of Amphibolips radicola. 
76b. Section of mature gall of A. radicola. 
HISTOLOGY. 
77. Section of young gall of Phytoptus quadripes. 
78. Section of young gall of Phytoptus abnormis. 
79. Section of nutritive zone of young gall of Amphibolips inanis. 
80. Section of mature gall of A. inanis. 
81. Section of mature gall of Callirhytis papillatus. (Nutritive, protective and part of 
parenchyma zones.) 
82. -Section of mature gall of Dryophanta palustris. (Nutritive, protective and part of 
parenchyma zones.) 
83. Section of mature gall of Andricus petiolicola. 
SURFACE SECTIONS OF 
84. Dryophanta palustris. (Very young gall.) 
84b. Dryophanta palustris. ( Mature gall. I 
85. Amphibolips inanis. 
86. Diastrophus siminis. 
87. Diastrophus potentilla. 
88. Pachypsylla c.-mamma 
89. Colopha ulmicola. 
90. Phylloxera c.-globuli. 
91. Pemphigus p.-transversus. 
OVIPOSITORS OF 
92. Cecidomyia gleditsiae. 
93a. Nematus salicis-ovum. 
93b. Nematus salicis ovum. 
94. Dryophanta palustris. 
95. Amphibolips radicola. 
96. Andricus cornigerus. 
97. Andricus serainator. 
98a. Rhodites radicum. 
98b. Rhodites radicum. 
MOUTHPARTS OF 
99. Colopha ulmicola. 
looa. Pachypsylla c.-mamma, with setae extended. 
loob. Pachyp.sylla c -mamma, with setae retracted, 
101. Cecidomyia gleditsiae. 
102. Cecidomyia pellex. 
103. Andricus petiolicola. 
104. Amphibolips inanis. 
105. Amphibolips confluentus. 
io6a. Diastrophus siminis. 
io6b. Diastrophus siminis. 
107. Callirhytis papillatus. 
108. Parasite from gall of C. papillatus. 
109. Holcaspis globulus, 
no. Nematus pomum. 
HI. Gelechia gallae-solidaginis. 
