Luisa 1942 Spilosoma Lake Omega, 200' W of St. Ana Miguel, El Salvador Feb. 15, 1942 Walking down a trail in the dense forest about 1 1/2 mi. W of camp, I saw a large individual, and shot it as it lay coiled on the ground. The .38-12 only served to arouse it, and it climbed with amazing rapidity through the branches of a small tree to a height of about 12'; where I shot it with .410-12. It checked its flight and forced me, but was apparently not crippled. I changed to a half load, during which time the snake fell from the tree and crawled rapidly into a dense clump of brush, and out of sight. I ran around to the other side of the brush, and shot it behind the head as it emerged. This stopped it, although it struck wildly several times, and threw a coil around my leg when I stepped on it. The method of proceeding on the ground was much like that of a large racer, straight and steady, but not nearly so fast. (125!) In the afternoon a boy brought in a specimen with its head battered to a pulp. I bought it for 25 centavos. The coloration is radically different from the one took this a.m., being primarily yel- low, whereas mine is mostly black. That the two phases occur commonly is shown by the fact that the natives call the yellow variety "misa" and the black variety "micasala". That there