Callirhytis crassicornis, new species.

A peculiar, irregular, somewhat triangulated, hard, finely rugose, blackish seed-like gall, issuing from the twig, most of them being covered with a whitish efflorescence.

The gall, structurally, is similar to that produced by A. conifera, Ashmead, and the part embedded in the twig is triangularly shaved off to a sharp edge. The fly escapes from its larval cell through a hole perforated in the side.

Four female specimens received through Mr. F.B. Hough, reared October 10, 1884.