365 



Group P.. 



Amphibolips inanis, O. S. 



" ilicifoliw, Bassett. 



Coelebs, O. S. 



citriformis, Ashmead. 



melanocera, " 



cinerea, " 



" cooki. Gillette. 



" tinctoria, Ashmead. 



Group C. 



Division a. 

 Amphibolips spinbsa, Ashmead. 



globulus, Beutennriiller. 



Division b. 

 .1 mphibolips nuMlipennis, Harris. 

 racemaria, Ashmead. 



Division c. 

 Ampliibolips primus. Walsh. 

 " gainesi, Bassett. 



" fuiiginosa, Ashmead. 



" palmeri, Bassett. 



" trizonata, Ashmead. 



The writer has previously made studies of the histology of A- con- 

 fluens. A. inanis, A. ilicifoliw, A. nuMlipennis, and A. primus. 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-vascular 

 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. ilicifoliie and A. coe- 

 lebs, which, judging from Beutenmullev'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 



