be more or less active mimicry in two small British moths. Penthina gentianana, in its larval condition, feeds on the pith of the receptacle in teasel-heads, seed-heads of Dipsacus sylvestris; while another moth (Eupœcilia roseana) feeds on the seeds themselves. "The habit of P. gentianana on its emergence is to sit with head buried between the spinous scales of the receptacle, and with the posterior portion of its wings projecting a little beyond them. Roughly divided (as the insect is into a light upper and a dark lower part), its resemblance when in this position to a bird's excrement is very noticeable. If a number of teasel-heads be examined, it will be found that in some instances the inner part of the seeds—i.e. that part which is in contact with adjacent seeds—assumes a bright pink colour. Now, E. roseana has a very frequent habit of sitting lengthways along the spines of the scales above referred to, and here again the resemblance of the insect, with its colouring of rosy pink shading into yellow, to a partly displaced seed is worthy of notice."[1] One of the strongest illustrations of protective mimicry by a butterfly, and one of the most widely known—for who has not read Wallace's 'Malay Archipelago'?—is afforded by leaf-butterflies of the genus Kallima. But, as Mr. Badenoch has well enquired, "Of what avail would be the disguise were the insect prone to settle upon a flower, or green leaf, or other inappropriate surface?"[2] The partiality of this insect for settling on dry and withered leaves appears a true instance of active mimicry. The idea of some conscious volition in the protective habits of this butterfly is supported by remarks made by the Indian naturalist who writes under the name of "Eha":—"They see a little better in front of them, and I have noticed that the leaf-butterfly always alights head downwards, so as to face anything coming up the tree, which is much the most likely direction of assault from a Lizard. (In pictures generally, and in the show-case at the British Museum (Nat. Hist.), the butterfly is turned the opposite way, facing upwards, which is no doubt more appropriate to its character as a leaf; but that is a detail rather above the intelligence of a Lizard: at any rate, I never saw a Kallima sit in that position.)"[3]
