orange-colored markings which somewhat irregularly adorn their backs are perfect imitations of the lichens covering the rocks and pebbles among which these odd looking creatures live. Near the rim of the Grand Canyon of the Colorado, on the other hand, the ground is covered with small pebbles of variously colored sandstone, ranging from a clayey white to brick red and dark brown, and the specimen which I collected there is such a faithful reproduction of the surroundings that it would undoubtedly have remained undetected had it not been moving. Even more remarkable are the specimens which Dr. Merriam collected in the black lava belt. One of these was brought to camp alive.” Dr. Stejneger made a careful study of this specimen and found that it had very closely imitated the color of the lava, including even its glossy appearance. One of the most remarkable habits of at least one of the species, and possibly of all the Horned Toads, is the power of ejecting jets of blood from the eyes. This power is rarely exercised and seemingly only when greatly irritated. Professor L. M. Underwood relates the following instance, which also illustrates some of the other habits of the Horned Toads when angered: “In 1885 a student of mine received a specimen of Horned Toad from California. In examining the animal I took occasion to turn him on his back, using a lead pencil for the purpose. The animal resented this treatment and showed considerable anger, opening his mouth and puffing up his body. Irritating the animal still more, he grew more and more enraged, until finally blood spurted from just above his eye, which was fired at least a foot from the animal, as several spots struck my arm considerably above my wrist. After spurting the blood the toad became limp and collapsed, and remained in a stupor for some time, and, when handled, behaved as if dead. After a time, possibly not over five or six minutes, certainly not over ten, the animal revived and commenced to run about the table.” Irritating him again in the same manner, Professor Underwood caused the toad to go through the operation a second time, which was followed, as in the first instance, by collapse and stupor. “No amount of irritation could produce a third discharge, although the animal showed some anger.”