Somewhat analogous to these pseudo-nectaries are the greenish swellings which arise on the veins of the petals of Eremurus. These little swellings present a striking resemblance to aphides, or plant-lice, and Kerner states that a fly accustomed to hunt after aphides pierces and sucks the swellings, apparently mistaking them for the insects. Relations which remind us of the pink orchid and mantis, mentioned above, seem to exist between the little bladders of Utricularia and the entomostracans. The bladderwort is a carnivorous plant with small submerged vesicles in which minute insects and entomostracans are caught. In shape these little traps of Utricularia are not unlike the body of a crustacean; the stalk corresponds to the tail, and near the entrance of each bladder are several antenna-like filaments so resembling certain appendages of the crustaceans that they impart to the structure a ludicrous resemblance to such an entomostracan as Daphne. This curious likeness was remarked by Mr. Darwin and can hardly be altogether accidental; perhaps the prey is more readily induced to approach the snare by reason of the resemblance. Here also may be mentioned the imposture practiced on its victims by Darlingtonia, another insectivorous plant. In the hood of its pitcher-like leaf are several transparent spaces through which the light shines into the interior; to these the imprisoned flies are attracted and thereby diverted from the only opening through which escape is possible. Mistaking the “windows” for real openings, the captives exhaust themselves in vain efforts to regain their liberty and are ultimately precipitated into the depths of the pitcher. The flowers of the ox-eye daisy and the feverfew are very much alike, and this was adduced by the late Mr. Grant Allen as a possible case of mimicry. But the probability is that in this instance the resemblance is merely homomorphic. The colors of flowers are distinctive as well as attractive. Where two species of plant grow together and are in blossom at the same time it is to their disadvantage to have the flowers of the one mistaken for those of the other. To secure cross-fertilization it is needful that the insect visitors pass from one flower to another of the same species, otherwise the pollen will be conveyed to the stigmas of the wrong species. It is of importance that the fertilizing agents should be able readily to distinguish different flowers, and this is no doubt one reason for the diversity of their colors, shapes, and odors. This circumstance must operate as a check against the production of mimetic blossoms; it will not, however, prevent flowers from acquiring a likeness to any object other than a flower.