GRouP B. 
Amphibolips inanis, O. 8. 
= ilicifolie, Bassett. 
- Coelebs, O. 8. 
ae citriformis, Ashmead. 
s melanocera, = 
ce cinerea, re 
cooki, Gillette. 
tinctoria, Ashmead. 
Grour C. 
= Division a. 
Amphibolips spinosa, Ashmead. 
ce globulus, Beutenmiiller. 
Division D. 
Amphibolips nubilipennis, Harris. 
cs racemaria, Ashmead. 
Division ¢c. 
Amphibolips prunus, Walsh. 
us gainesi, Bassett. 
fuliginosa, Ashnead. 
palmeri, Bassett. 
trizonata, Ashmead. 
“ec 
The writer has previously made studies of the histology of A. con- 
fluens, A. inanis, A. ilicifoliw, A. nubilipennis, and A. prunus. Taking A. 
confluens as a type of the group A, we find the parenchyma zone very 
thick and composed of cells which when mature have the character of a 
mass of colored cotton, and among which may be found fibro-vasculac 
bundles. The parenchyma cells, when examined under the microscope, 
are found to be unicellular, long and threadlike. The protective zone is 
comparatively thin. The nutritive zone is prominent only in the young 
galls. The writer has not had an opportunity to examine the other three 
species of this group, but from the taxonomic discussion, they appear to 
coincide very closely with A. confluens. 
In group B the writer has studied A. inanis, A. ilicifolia and A. coe- 
lebs, which, judging from Beutenmuller’s description, are quite typical of 
the group. In these galls the parenchyma zone is characterized by large 
intercellular spaces. A part of the parenchyma cells remain attached to 
