It is of a dark chestnut-brown in color, and the mandibles of the male, as is usual in species of Zucanus, are much enlarged, and have a single tooth on the inner side.

Elaphus, whose mandibles are branched in the male, and often 0,75 of an inch long, is called, on account of its antler-like mandibles, the stag-beetle.

It closely resem- bles cervus, the European stag-beetle, which latter is, however, somewhat larger.

The larvae of Lucanus , which inhabit dead wood, have six well-developed legs, an- tennae of four joints, and the anus in a longitudinal cleft- Differing from LucanuS) in having an emarginate raentum, are the species of Pas- salus, which are numerous in some tropical regions, but of which only one is found in the United States.

This species, cornutus, is flattened, cylindrical in form, about 1.