[Illustration: FIG. 130.—An Eocene Butterfly (_Prodryas persephone_, Scudder). From Colorado.] The suctorial insects make their first certain appearance in the Jurassic; and the magnificent Sphinx Moth in Fig. 129 is an example of the magnitude and perfection to which that tribe attained in the age of the Solenhofen slate; though Weyenburgh, who describes it, fancies that he sees evidence that it may, unlike any modern moths, have been provided with a sting. The most perfect and beautiful fossil butterfly known to me is that represented in Fig. 130, from a photograph kindly given to me by Mr. Scudder. It is from the Tertiary rocks of Western America, and is laid out in stone as neatly as if prepared by an entomologist, while its preservation is so perfect that even the microscopic scales on the wings can be made out. It belongs to one of the highest types of modern butterflies, that to which the _Vanessæ_ belong, but with some points of structure pointing to the lower group of the “Skippers” (_Hesperiadæ_). Scudder remarks that while the fore-wings resemble those of the former group, the hind-wings look more like those of the latter; and this seems to be a common character of two or three others of the few fossil species known, none of which are older than the Tertiary. [Illustration: FIG. 131.—Abdominal part of a Carboniferous Scorpion.[54]] We know too little of the spiders and scorpions of the Carboniferous to say more than that they closely resemble modern forms. Two of the scorpions are represented in Figs. 131 and 132; and the only spider certainly known, which is from Silesia, is said to belong to the group of the hunting or trap-door spiders (_Lycosa_).[55]