1865.] 



349 



Group of white and chestnut-oaks. | Group of red, black and willow-oaks. 



42. 



1 



C. q.palustris O.S. 



Q. palustris. 



Q. tinctoria. 

 Q. falcata. 

 Q. coccinea. 

 Q. imbricaria. 

 Q. ilicifolia. 



2. Swellings or expansions of the leaf or of the leaf-ribs, mostly 

 polythalamons, except No. 7, which seems to be monothalamous.* 



a. Juicy swellings of the blade of the d. Swellings of the leaf, usually 

 leaf; of a cellular, pithy structure, along the ]:>rincipal ribs ; they contain 

 when dry. numerous, seed-like kernels. 



18. Q. obtusiloba: C. irregularis 0. S. 33. Q. nigra; C. q. nigrae 0. S. 



34. Q. tinctoria; C. tumifica 0. S. 



35. Q. rubra ; C. modesta 0. S. 



19. Q. alba ; C. majalis Bassett. 



b. Expansion of the leaf, not juicy, 

 with two or three seed-like kernels in 

 the centre, kept in position by filaments. 



9. Q. alba ; C. futilis 0. S. 

 10. Q. prinusj C. papiilata 0. 8. 



c. Hard, woody swellings of the leaf- 

 stalk at the basis of the leaf, or of the 

 principal leaf-rib. 



7. Q. montana ; C.petiolicola Bassett. 



7. O. prinoides I • . , 



' ■ "* r I same insect? 



7. Q. alba J 



7. Q. prinus ; same gall? Insect un- 

 known. 



II. GrALLS ON BRANCHES, TWIGS, ETC. 

 .1. Galls of a different substance than the limb, and which can be 

 taken off, without carrying a portion of the branch with them. 



1. Monothalamous galls, mostly of a corky substance (except the 

 gall No. 54, which is filled with a spongy substance.) 

 a. Each gall wedge-shaped ; a num.- c. Large globular gall, growing from 

 ber of them growing together, with the the side of the cuj) of the acorn. 

 }>< lints of the wedges in the centre, form 53. Q. rubra ^ Gall-fly unknown; 



a body not unlike the cone of a pine. 



1. Q. prinus (var. bicolor). C. strobi- 



lana 0. S. 

 b. Galls globular, smooth, or with a 

 nipple or point at the end. 



52. Q. prinus (var. bicolor) ? Gall-fly 



unknown. 



2. Q. alba 

 Q. montana 



2. Q. obtusiloba ~) Galls similar to 



> the preceding ; — 



2. Q. macrocarpaj gallflynot reared. 



53. Q. alba?? Gall-fly unknown : gall 



named Q. juglans 0. S. 



C. globulus Fitch. 



j- gall named Q. pru- 

 Q. tinctoria J nus Walsh. 



d. Subcorneal galls, often in clusters. 

 37. Q. ilicifolia; C. ventricosa Bassett. 



e. Cluster of elongate-ovate galls. 

 *29. Q. rubra: C. formosa Bassett. 



/. Monothalamous, oblong galls, filled 

 with a spongy substance. 

 54. Q. falcata; gall-fly unknown. 



*The gall of C. petiolicola is certainly polythalamous.— H. F. Bassett. May 

 25th. 1865. 



