NORTH AMERICAN HYMENOPTKRA. 129 



tf. — Keriial cocoon-like, rolling freely about within the cavity 

 Galls globular, projecting on both sides of the leaf . Dnjo- 

 phanta palustris O. S. (Q. palustris) ; J), laurifolice 

 i^shni. (Q. laurifolia) ; D. aquatkip Ashm. (Q. 

 aquatica) ; D. quercifolce Ashm. (Q. catesbsei). 

 Galls semiglobular, not projecting above the upper surface 

 of leaf . Dryophanta notha O. S. (Q. palustris) ; D. 

 confusa Ashm. (Q. laurifolia) ; D. cinerece Ashm. 

 (Q. cinerea). 

 b. — Swellings or expansions of the leaf ribs ; mostl}^ polythala- 

 mous. 



f. — Juicy, irregular swellings of the blade of the leaf; of a 

 cellular, pithy structure when dry . ^Neurotems 

 majalis Bass. (Q. alba, Q. prinus) ; ^N. irregularis 

 O. S. (Q. obtusiloba). 



f f . — Cellular swellings of the leaf, usuall)^ along the principal 

 ribs ; they contain numerous seed-like kernels . An- 

 dricus plger Bass. (Q. tinctoria) ; CalUrhytis twnifica 

 O. S. (Q. tinctoria) ; C. modesta O. S. (A. rubra) ; 

 C. nignB O. S. (Q. nigra) ; C. celhe Ashm. (Q. 

 laurifolia). 



tff. — j^on-juicy expansions of the leaf, with t^vo or three 

 seed-like kernels in the centre kept in position by 

 filaments or a cellular substance . CalUrhytis fidilis 

 O. S. (Q. alba) ; C. papillatm 0. S. (Q. prinus, Q. 

 prinoides). 

 Small, papillose, cone-like galls in clusters . Dryo- 

 phanta papida Bass. (Q. rubra, Q. tinctoria). 



tttt- — Globular, hard expansions of the leaf, at the basis of 

 the leaf, or on the principal leaf-rib, part appearing 

 above the leaf cone-shaped ; below rounded . An- 

 dricus qidnqueseptu7n Ashm. (Q. obtusiloba); A. 

 petiolieola Bass. (Q. montana) ; A. parr if of iie Ashm. 

 (Q. parvifolia). 



ttttt- — Hard, prone circular galls sessile on the under sur- 

 face of the leaf not appearing on the upper surface 

 Andricus rugosus Ashm. (Q. laurifolia); Cynipsf 

 cicatricula Bass. (Q. alba). 



■•■• These two species are piobably identical ; X. irregularis O. S. having the 

 priority. It will form the type of a new genus DolichoDtrophns m. 



TRANS. AMER. ENT. SOC. XIV. (17) MAY, 1887. 



