Page:New species and synonymy of American Cynipidæ.pdf/9

 form of the plant, monspeliensis, which ranges from Alaska south into the District of Columbia and New Mexico. Or possibly still others of the larger-stemmed, shrubby species of Potentilla will have the same gall.

I also cut a parasite out of the gall—a species of Eurytomidæ.

Neuroterus thompsoni, new species Plate XXI, Figures 8 and 9

The galls form in May.

Dr. M. T. Thompson mistook this material for Neuroterus rileyi, a middle-western species which N. thompsoni in general resembles, but the two are really quite distinct. N. thompsoni is only about half as large as the other species, both in the gall and the adult; the coloring of the antennæ and legs will distinguish thompsoni.

Through the kindness of Mr. C. W. Johnson, Curator at the Boston Society of Natural History, I have had an opportunity to study cynipid material in the Thompson Collection of galls and gall-insects. Though this collection was made in but a single season, the number of species therein represented is surprisingly large and is a credit to the thoroughness with which Dr. Thompson worked. I am glad to be able to give his