. The descent of man : and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. 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 Cui'culionidre and Staphylinidce, are fur- nished with homs—in the former on the lower surface of the body,*"^ in the latter on the upi^er surface of the head and thorax. In the Staphylinid?e, the horns of the males are extraordinarily variable in the same species, just as we have seen with the Lamellicorns. In
. The descent of man : and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. 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 Cui'culionidre and Staphylinidce, are fur- nished with homs—in the former on the lower surface of the body,*"^ in the latter on the upi^er surface of the head and thorax. In the Staphylinid?e, 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 tiie 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 Staphylinidse, Professor Westwood. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Darwin, Charles, 1809-1882. New York : D. Appleton and Company
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