. African mimetic butterflies : being descriptions and illustrations of the principal known instances of mimetic resemblance in the Rhopalocera of the Ethiopian Region, together with an explanation of the Miullerian and Batesian theories of mimicry, and some account of the evidences on which these theories are based. Butterflies; Mimicry (Biology). INTRODUCTION 9 In the fore-wing the first nervure is a stout rib emanating from the base of the wing and extending some distance along the costa. This is the costal nervure and is without branches. Beneath this, and in close proximity, arises the su
. African mimetic butterflies : being descriptions and illustrations of the principal known instances of mimetic resemblance in the Rhopalocera of the Ethiopian Region, together with an explanation of the Miullerian and Batesian theories of mimicry, and some account of the evidences on which these theories are based. Butterflies; Mimicry (Biology). INTRODUCTION 9 In the fore-wing the first nervure is a stout rib emanating from the base of the wing and extending some distance along the costa. This is the costal nervure and is without branches. Beneath this, and in close proximity, arises the subcostal, which usually gives off five branches, though in some cases a smaller number may be present. The last two branches form a kind of fork which stiffens the apex of the wing. Beneath is given off the median nervure which always has three branches. The distal ends of the subcostal and median nervures are united by two or three small cross nervules called discocellular, and designated respectively the upper, middle, and lower. The first is often much reduced, in some cases almost obsolete, and in others absent. The lower discocellular nervule is frequently absent or very rudimentary, especially in the hind-wing, the space between the subcostal c, Costal nervure; sc., subcostal; sc. i, 2, 3,4,5, branches of subcostal; , upper radial; , lower radial; m. i, m. 2, m. 3, branches of median; , submedian; , precostal; mdc, middle discocellular; UDC, upper discocellular ; ldc, lower discocellular ; D., discoidal cell; i., internal. In the hind-wing UR. is the second branch of the subcostal in English nomenclature. and the median, called the discoidal cell, being in these cases open at the distal end, a very noticeable feature in many genera. The area from the discoidal cell to the hind-margin is supported by two branches called the discoidal or radial nervules, which have been con- sidered to be branches of a formerly existing discoidal nervure. Beneath the median is
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