134 W. H. ASHMEAD. 



Elongated swellings of the twigs covered with dense prickles ; 



polythalamous . Bhodites spinom Ashm. (Rosa 



rubiginosa). 

 C. — Galls on the roots. 



Rounded, warty gall ; polythalamous . Bhodites radicum 



O. S. (Rosa Carolina). 



3.— A Synopsis of the North American Cynipidous Bramble Galls. 

 A. — Galls on the stem or branches. 



An abrupt, pithy swelling surrounding the stem ; polythalamous 



Diastrophvs turgidus Bass. (Rubus strigosus). 

 An abrupt, elongated, longitudinally furrowed, pithy swelling 



surrounding the stem, from two to over three inches 



long ; polythalamous . Diastrophus nebulosiis O. S. 



(Rubus villosus). 

 Small, round, seed-like galls surrounding a branch, in clusters; 



monothalamous . Diastrophus cuscidceformis O. S. 



(Rubus villosus, R. canadensis and R. cuneifolium). 

 B. — Galls on the roots. 



Irregular, fleshy galls from the size of a pea to two inches or 



more in length ; polythalamous . Diastrophus 



radicum Bass. (Rubus villosus). 



4.— A Synopsis of Miscellaneous Cynipidous Galls. 

 Small, oblong, spongy galls in leaf axils of Cinquefoil (Potentilla 



canadensis) ; monothalamous . Diastrophus 



potentillce Bass. 

 Rounded, thin walled galls, with cells held in place by coarse fibres, 



growing on the leaves, petioles and occasionally on 

 \^ stem of the catnij^ (Nepeta glechoma) ; polythala- 



mous . Diastrophus siiyiilis Bass. 

 Small, rounded galls with the larval cell held in place by a dense, 



white, spongy substance, occurring on Lygodesmia 



juncea . Antistrojohus pisumWahh. 

 Irregvdar, egg-shaped cells connected by fleshy, potato-like matter on 



the Potato (Solanum tuberosum) . Trihalia baia- 



torum Walsh. 

 A reniform, j^ithy gall on the stem or branches of Vaccinium corym- 



bosum and V. pennsylvanicum . Solenozopheria 



vaccina Ashm. 



