Of all tropical butterflies, heliconias seem the most casual and irresponsible. The background of the wings of many is jet-black, and on this sable canvas are splashed the boldest of yellow streaks and the most conspicuous of scarlet spots. Unquestionably protected by nauseous body fluids, they flaunt their glaring colors in measured, impudent flight, weaving their way slowly through the jungle, in the face of lizard and bird. Warningly colored they assuredly are. One cannot think of them except as flitting aimlessly on their way, usually threading the densest part of the undergrowth. No butterflies are more conspicuous or easier to capture. They must feed, they must pay court and mate, and they must stop long enough in their aimless wanderings to deposit their eggs on particular plants by an instinct which we have never fathomed. But these are consummations hidden from the casual observer. Now, however, I am prepared for any unexpected meaningful trait, for I have surprised them in a habit, which presupposes memory, sociability and caution, manifested at least subconsciously. The afternoon had worn on, and after leaving my lizard, I had squatted at the edge of a small glade. This glade was my private property, and the way by which one reached it from the nearby Convict Trail was a pressure trail, not a cut one. One pushed one's way through the reeds, which flew back into place and revealed nothing. Lifting my eyes from the tragedies of a hastening column of army ants, I saw that an unusual number of heliconias were flitting about the glade, both species, the Reds and the Yellows. All were fluttering slowly about and as I watched, one by one they alighted on the very tips of bare twigs, upside down with closed wings. In this position they were almost invisible, even a side view showing only the subdued under-wing pigments which blended with the pastel colors of twilight in the glade, reflected from variegated leaves and from the opening blossoms of the scarlet passion vine. Perhaps the most significant fact of this sleeping posture, was the very evident protection it afforded to butterflies which in motion during their waking hours are undoubtedly warningly colored and advertised to the world as inedible. Hanging perpendicularly beneath the twig, although they were almost in the open with little or no foliage overhead, yet they presented no surface to the rain of the night, and all faced northeast--the certain direction of both rain and wind. The first one or two roosting butterflies I thought must be due to accidental association, but I soon saw my error. I counted twelve of the Red-spots and eight Yellows on two small bushes and a few minutes' search revealed forty-three more. All were swung invariably from the tips of bare twigs, and there was very evident segregation of the two kinds, one on each side of the glade.