Andricus albobalani Weld.

Quercus douglasii, dumosa, durata, lobata
Acorn galls
Fig 48. In wall of undersized acorn in fall.

48. Q: dumosa. Also on Q. lobata, douglasii, durata. Affected acorns apt to be lop-sided and remain on the tree. Adults were cut out in early March; larvae indicated there would be some emergence the next spring.

Andricus albobalani, new species

Host. — Quercus dumosa.

Gall (fig. 45). — A single non-separable cell developed in the wall of acorn toward its base. Affected acorns are undersized, lopsided, firmly fastened in cup and remain on tree. Sometimes two in an acorn. Exit hole in wall of acorn near apex. Found in fall and winter.

Habitat. — Type locality, Boulevard, Calif., where affected acorns were collected on March 2, 1922, and seven living adults cut out. Transformation probably occurs in the fall and emergence in the spring. The finding of larvae in a few of the galls in March indicates that some individuals hold over and emerge the second spring. Similar galls were seen on the same oak at Descanso, Paraiso Springs, Los Gatos, St. Helena, and Lakeport.