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 The general shape of this gall is very different from that of most of the species of Disholcaspis, but the location and character of the larval cell is typical for that genus. The insect is a true Disholcaspis.

Beside the two cotype adults from normal galls, I cut from a very small cotype gall a female which is in all respects like the cotypes but that it is generally darker and is very remarkably smaller in size, being only 1.7 mm. in length. I do not recall that I have ever before found an individual of the gall-wasps varying so from the average of length for the species.

Practically every one of the galls I have seen had large exit holes, indicating that a large number of the wasps had reached maturity and had emerged.

Disholcaspis plumbella, new species Plate XXVI, Figures 34 to 36