Andricus howertoni Bass

Irregular, monothalamous, green twig galls, length 18 mm, diameter 12 mm, when green covered with leaves, on Quercus species

Andricus howertoni

Quercus subturbinella [turbinella]
Stem galls
Stem swellings
Fig 68 and 140.

Andricus howertoni Bassett

This species was described from a gall on an unknown oak in New Mexico. The writer has collected galls, which agree with a Bassett type gall, on Q. undulata and grisea at Las Vegas, Tijeras, Magdalena and Kingston, N. Mex. and at Williams, Ashfork, and Prescott, Ariz. Galls collected at Williams on April 11 gave adults by May 11 and some held over and emerged the next spring.

Andricus howertoni, n. sp.

Galls. — Woody, club-like enlargements of the tips of the twigs one of the New Mexican oaks, species uncertain. They bear some resemblance to the galls of A. clavula Bass, and A. similis Bass. When green they are covered with leaves even more completely than the first named well-known species, and these and their large stipules still adhere to the dried galls. They are monothalamous, the enclosed larval chamber is not free, and is placed near the base of the gall and immediately above it is a much larger, irregular open space, through which the insect passes in leaving the gall. The galls are rather irregular in shape, but when green are probably about three- fourths by one-half inch in diameter. In some specimens the gall does not wholly retard the axis of growth, and short, leafy stems project out of it.