NORTH AMERICAN HYMENOPTERA. 133 



d(I. — Large size . Loxaulls mammilla Bass. (Q. alba, Q. 



parvifolia). 

 F. — Tabular, fusiform, round, or oval shaped galls, issuing from 



fissures in a branch or twig ; oecniri-ing always in 



clusters. 

 Tubular or fusiform galls surrounding a terminal twig . An- 



dricus gemmarim Ashm. (Q. cinerea). 

 Eugose, oval galls, the rugosities in ridges . Andricm diffi- 



cilis Ashm. (Q. cinerea, Q. catesbsei). 



Div. III. — Galls on the roots. 

 Soft, fleshy, polythalamous gall on the rootlets , Belonocnema 



Treatce Mayr. — Syn. Dnjorhyoxenus floridamis Ash. 



(Q. virens). 

 Hard, polythalamous gall, rounded, and composed of nuuiy hard 



larval cells . Eumayria multiarticulata Ashm. 



(Q. laurifolia). 



2.— A Synopsis of the North American Cynipidous Rose Galls. 

 A. — Galls on the leaves. 



Small, globular galls, covered with white efflorescence; niono- 



thalamous . Ilhodites Carolina Ashm. (Rosa 



Carolina). 

 B. — Galls on the stem or branches. 



Hard cells, surrounding a branch, covered with green moss-like 



filaments ; polythalamous . Rhodites rosce Linn. 



(Rosa rubiginosa). 

 Irregular, abrupt, woody swellings of the branch about two 



inches long ; polythalamous . Rhodites dichlocerits 



Harris (Rosa Carolina). 

 Small, rounded swellings of the branch, somewhat hollow inter- 

 nally ; polythalamous . Rhodites verna (.). S. 



(Rosa blanda). 

 Abrupt, rounded swellings surrounding smaller twigs and 



branches, of a hard, i)ithy structui'C, seldom over an 



inch long ; polythalamous . Rhodites ii/nota O. S. 



(Rosa lucida and R. Carolina). 

 Small, round galls covered with prickles, sometimes coalescing; 



monothalamous . Rhodites bicolor O. S. (Rosa ? 



Carolina). 



