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Rh (before October 4 at Kelseyville and October 16 at Diablo in 1925); and adults may be found in the galls soon afterwards. The pupal period is short, and for a time in October and November mature larvae, pupae, and immature adults may be obtained from a single collection.

Adults, not yet fully pigmented, were in the galls at Kelseyville on October 30, and on October 29 at Diablo in 1925. These adults do not begin emerging until the end of November (November 26 from Diablo material in 1925, and November 28 acc. McCracken coll.), or after the first of December (December 19-24 acc. Ashmead, and December 18-29 from Diablo material in 1922). Kelseyville material bred here at Bloomington, Indiana, emerged out-of-doors early in January (in 1926), and a few of the insects emerged as late as February 1 (in 1927). In the field the galls collected by the last of January (at Diablo) are usually empty of insects except for the parasites and inquilines which emerge at later dates. One very large collection made at Diablo as early as December 18 (in 1922) was already empty of gall-making Cynipidae. The records of indoor breedings are usually later: January and February acc. McCracken, and January in my own experience; but it should be noted again that increased temperatures appear to delay emergence in many Cynipidae. The succeeding generation, a form named lobata, appears with the bursting of the buds in March or April.

In November the agamic galls fall to the ground either attached to or separated from the leaves, or the galls remain attached to the leaves which hang on the trees over winter. The galls on the ground are decayed soon after the first of the year, but good specimens may still be found on the trees in the spring (as late as March 7 at Paso Robles in 1920).

Ashmead accredited this insect to Quercus Douglasii, but the fragments of leaves with the type galls are clearly those of Q. lobata. The Douglasii record is copied in most of the literature, altho two students (Fullaway and McCracken) who have known this variety in the field have pointed out that the white oak, Q. lobata, is the real host. Of the several thousand galls which Mr. F. A. Leach collected for me from a number of localities and at all seasons over a period of four years, practically every one came from Q. lobata; but two meager collections, a total of 21 galls found in 1922 at