XIII. 



Pi^re 102. Part of cross-section from the gall of Horn- 

 (p. 239) omyia fagl . k, crystal reservoir, g. vas- 



cular Limdles, ii, mechanical mantel, U. 

 nutritive tissue , (Original) , 



Pigiire 104. Cross-section through the gall of CecicL omyia 

 (p. E40) C errio (half). AA inner mechanical mantel; 



"S7 outer mechanical mantel, (palisade- like 

 sclereids) • (Orip:inal) . 



Figure 105. Part of cross-section through the mechanical 

 (p. E41} tissuG of the gall of Diastrophus Poten- 



tillae, U, nutritive tissuo; R, gall-hark. 

 (Original) . 



Figure 106. Quercus . Part of cross-section through the 

 (E42) galls of Acraspis macropterae on the oak. 



A, outer mantle; B, inner mechanical 

 mantel. In E, part of the epidermis more 

 highly magnified. (Original) . 



Figure 107. ^uercus Wislizeni . Irregularly thickened 

 (p, 24S) sclerxds from an undetermined Cynipes 

 gall. (Original) . 



Figure 108. Some diagrammatic formal types of the mech- 

 (p. 245) anical gall-tissue. A, hall-shaped gall; 



B, "louse gall"; C, medullary gall of 



. Oecldomyia tiliecea ; D, medulary gall of 



C, Cerris :" fi. me^lullary gall of Banisteria 

 F, Walled gall; G, curled leaf gall; H, 

 gall of DiploGis glo.hal i; I, gall of 2). 



! botularia. (Original). 



Figure 109, Gross-section through the gall of Oynl^ss 

 (p. 246) Mayri . [Che mechanical tissue is indicated 

 "by shading, (Original) . 



Figure 110. Fraxinus . Tissue closing the Botularia gall, 

 (p. 247) L, larval chamber, (Original)* 



Figure 111. Cross-soction through an undetermined 

 (p. 248) Afriaan gall of an Anberstiee. The mech- 

 anical mantle. (shaded) eonsists of two 

 separated parts. (Original) . 



Figure 112. Gall of Oeoidomyia tiliacea . The gall, grow- 

 (p. 249) ing internally frees itself and finally 



opens with a lid. (After Kerner) , 



Figure 113. Some nutritive hairs from sac galls, a, Acer, 

 (p. 251) Erinex^m^.like hairs from a Phytoptus mite 

 gall; b, Ulmus effusa . papillae-like 

 hairs from the sac gall of Tetraneura 

 compressa . (Original) • 



