The Ray Society Monograph Of The Collembola And Thysanura PDF Download

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1873 edition. Excerpt: ...that the two terminal segments are not seen from above when the animal is in its natural position. The penultimate segment is small, and only distinguishable on the ventral side. Variety a.--Head yellowish, with a tinge of green on the posterior part, more or less distinct brownish markings on the central line, and a curved patch of the same colour behind the antennae; eye-disc, black. Back, greenish, mottled with brown; the size as well as the darkness of the markings vary in different specimens; but the fundamental pattern is generally the same, though the proportions of the parts may differ considerably. On each side of the median line on the anterior half of the abdomen is a more or less interrupted band; about the middle of the back (that is to say, at their lower extremity) these are joined on the outer side by a diagonal band, and the two on each side unite, then separate again, and pass outwards and backwards, soon, however, returning again to the middle line, and thus enclosing a more or less quadrate or circular space of the paler colour. In the middle line, and at the posterior end of the great abdominal segment or segments, is a marking, which is very characteristic. There is first of all a small dark square, immediately behind which are three oblongs of the same colour, and at the posterior end a dark band passing backwards. The pale spaces between the oblongs vary in width, and sometimes are almost obliterated. The oblongs also vary in length, sometimes increasing gradually in length from the front one, like the steps of a pyramid, while at others the two last or all three are of equal length. In different specimens I found every shade between brown and dirty olive-green, while in some the light ground preponderated over the..