Diastrophus tumefactus, new species

Galls.--Nodular swellings of the stem. Polythalamous or agglomerate, ie many separate cells nearly together in a single stem. Each swelling averages about 15 mm long by 10 mm in diameter, but several swellings will fuse to make one gall 7 cm, more or less, in length; it is covered with the smooth bark of the stem, but has scattered, very minute, blunt spines. The larval cells within are distributed irregularly through the pith which proliferates somewhat about the chamber, but this cell is not separable, nor is it formed of a distinct layer. On the stems of Potentilla monspelienesis var norvegica.

Range: Quebec, Ontario

- Alfred Kinsey: (1920) New species and synonymy of American Cynipidae^©