Archive image from page 320 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansele1889xdarw Year: 1889 Chap. X. Coleoptera, 299 The cases hitherto given refer to the Lamellicorns, but the males of some few other beetles, belonging to two widely distinct groups, namely, the Curculionidae and StaphylinidaB, are fur- nished with horns—in the former on the lower surface of the body,66 in the latter on the upper surface of the head and thorax. In the Staphylinidse, the horns of the males are extraordinarily variable in the same species, just as we have se
Archive image from page 320 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansele1889xdarw Year: 1889 Chap. X. Coleoptera, 299 The cases hitherto given refer to the Lamellicorns, but the males of some few other beetles, belonging to two widely distinct groups, namely, the Curculionidae and StaphylinidaB, are fur- nished with horns—in the former on the lower surface of the body,66 in the latter on the upper surface of the head and thorax. In the Staphylinidse, the horns of the males are extraordinarily variable in the same species, just as we have seen with the Lamellicorns. In Siagonium we have a case of dimorphism, for the males can be divided into two sets, differing greatly in the size of their bodies and in the development of their horns, without intermediate gradations. In a species of Bledius (fig. 23), also belonging to the Staphyliniclse, Professor Westwood
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