XII. 



Figure 91, 

 (p. 2E3) 



Pig:ure 92, 

 ]f)p. HE5) 



Figure 93, 

 (p* 286} 



Figure 94. 

 (p. 226) 



Figure 95. 

 fp. 227) 



Figure 96. 

 (p. 229) 



Figure 97 . 

 (p. 229) 



Figure 98. 

 (t» 230) 



Figure 99. 

 (p. 231) 



Figure 100, 

 fp. 235") 



Figure 101. 

 fp. 236) 



Figure 102. 

 fp. 237) 



Fraxinus. Section throue-h two "walled galls" 

 of I)iplosis botularia . In A the midrib 

 of a leaflet is infected; in B, the leaf 

 fp*mdle. at the right, and at the left, 

 are visible three vascular bundles, 

 (Original) . 



Part of a cross*. section through a gall of 

 P emphigus marsufialis . (Original) • 



Banistpria . Part of a croas-section of a 



lea:^ through the perii^heral section of an 

 undetermined gall. P, the ujn changed pal- 

 isade layer; m, in, laechanical iiantle. 

 (Compare also figure 108 E) . (Original) . 

 ■\ 



Cross-section through lense-shaped leaf-gall, 

 The cell rows in the interior are indica- 

 ted by dotted lines. L, larval chamber; 

 diagrammatic. (Original) 



Populus pyramidalis . A, longitudinal section 

 through the leaf stem which bears a gall 

 0^ Pemphigus bursarius . B, section through 

 the tissue roll, more highly magnified. 

 (Original) . 



Cross-section through the edge of the gall of 

 Cecidomyia tiliacea . (Original) . 



Part of a cross-section through the gall of 

 Jetraneura Ulmi. (Original) . 



Cross- section through a young gall of Hematus 

 gallarum. Ep, epidermis; H, a hair; I», 

 larval chamber. (Original) . 



Ulmus, Part of a cross-section of a cecidomyia 

 gall# The epidermal cells have been re- 

 peatedly divided by cross-walls. (E) . 

 (Original) . 



A, Epidermis of the gall of Hematus gall arum . 



B. The same of Andrious quadrilingatus . 

 (Original) . 



Part of a cross-section of the gall of Jac- 

 qujnia Sohiedeana Me iS« Ehe upper s^iper- 

 ficial cells are torn. The walls of the 

 deeper cell lajrers are thickened. In a, 

 is isilustrated the extension of this 

 thickening of the walls to deeper tissue 

 layers. (Original). 



Queil-otis confer ta . Oak gall of Heurotug »wn- 

 ismatis. a. cross-section through the gfte-ll* 

 L, larval chamber, b and c, some hairs, 

 at c, T-shaped forms. In b, irregular 

 forms;- from herbarium material. (Original) 



