Many other members of the Blattidae have an elegant appearance, and depart more or less from their fellows in structural characters, with the result of adding to their graceful appearance; in such cases, so far as at present known, these Insects are brightly coloured. Thus _Hypnorna amoena_ (Fig. 129) has the antennae banded in white, black, and red, while the overlapping part of the tegmina is arranged so as to bring the line of junction between them nearly straight along the middle line of the body, and thus produce a more symmetrical appearance than we find in other cockroaches. The head in this Insect is not so concealed as usual, and this undoubtedly adds somewhat to the effective appearance of this cockroach. This visibility of the front of the head in _Hypnorna_ is not, as would be supposed, owing to its being less inflexed than usual. On the contrary, the head is quite as strongly inflexed as it is in other Blattidae, but the part just at the front of the thorax is unusually elongate, so that the eyes are exposed and the Insect has a larger field of vision. This interesting Insect belongs to the tribe Oxyhaloides [Plectopterinae Sauss.], in which group the most highly developed folded wings occur. [Illustration: FIG. 129.—_Hypnorna amoena_. Central America. Tribe Oxyhaloides. (After de Saussure.)] The wingless forms never exhibit the grace and elegance possessed by some of the more active of the winged Blattidae. {235}One of them, _Gromphadorhina portentosa_, found in Madagascar (Fig. 130), is a very robust Insect, and attains a length of 78 millim.—somewhat more than 3 inches. This Insect has projections on the thorax that remind us of the horns that exist in some of the Lamellicorn beetles. Little has been yet written as to the resemblances of Blattidae to other species of their own family, or to other creatures, but it is probable that such similarities will be found to prevail to a considerable extent. W. A. Forbes has called attention[161] to the larva of a Blattid from Brazil as being remarkable for its superficial resemblance to an Isopod crustacean. Some of the wingless forms have a great resemblance to the small rolling-up Myriapods of the group Glomerides; _Pseudoglomeris fornicata_, of which we figure the female (Fig. 131), has received its name from this resemblance. The females of the S. African genus _Derocalymma_ possess this Glomerid appearance, and have a peculiar structure of the prothorax, admitting of a more complete protection of the head. Brunner states that the wingless kinds of _Derocalymma_ roll themselves up like wood-lice. In many of the forms of this tribe—Perisphaeriides—the males are winged, though the females are so like Myriapods. According to de Saussure[162] the gigantic _Megaloblatta rufipes_ bears an extreme resemblance in appearance to the large cockroaches of the genus _Blabera_. [Illustration: FIG. 130.—_Gromphadorhina portentosa_, × ⅔. Tribe Perisphaeriides. (After Brunner.)]