differs from it only in ending in a short, tapering point.
Holcaspis bassetti, Gillette. Host Quercus macrocarpa, Michx. Produced in clusters surrounding the stem. When not deformed by crowding, the gall is circular in outline at the base, but tapers to a distinct point.
Philonix hirta, Bassett. Host Quercus macrocarpa, Michx. A spherical gall originating from the midrib of the leaf ; its surface is faceted in appearance.
Philonix nigra, Gillette. Host Quercus alba, L. This species is also spherical in form, but the surface is felty in appearance, due to a dense pubescence.
Philonix erinacei, Beut. Host Quercus alba, L. Usually ellipsoidal in shape, springing from the mid-rib of the leaf. The surface is again in this case faceted, and each facet terminates in a distinct trichome.
On the hills of High Park a few specimens of Rosa blanda, Ait., are found. These plants act as hosts for a number of species of the genus Rhodites. Infesting the stems are found Rhodites multispinosus, Gillette, Rhodites globuloides, Beut., Rhodites dichlocerus, Harris, while from the root originates Rhodites radicum, O.S., and from the leaves are produced Rhodites bicolor, Harr., Rhodites lenticularis, Bassett, Rhodites ignotus, O.S., Rhodites gracilis, Ashm., and Rhodites nebulosus, Bassett. Near the