Free wallpapers for computer desktop. Wallpapers of butterfly. BUTTERFLIES AND MOTHS, members of the second largest insect order, Lepidoptera. They are outnumbered only by the beetles. The Latin name refers to the scale-covered, membranous wings common to all species. Most adult Lepidoptera are additionally characterized by a pair of well-developed compound eyes; mouthparts consisting of a long, coiled sucking tube, or proboscis; and prominent antennae.