Mecas inornata
Saperda inornata
Populus grandidentata, tremuloides
Irregularly spherical swelling of the twig, 1-3 cm. in diameter. At first smooth, pithy, in second season becomes cracked without and hollow within. Beetle bores its way out in May. On Populus grandidentata and P. tremuloides.
”- FA Stebbins: (1910) Insect galls of Springfield, Massachusetts, and vicinity©