Bulletin Volume 21-22

Bulletin Volume 21-22

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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. 1912 edition. Excerpt: ...the anterior border of the mesonotum apparently depressed, parapsidal grooves present but indistinct, median lines absent, scutel small, hairy, its hairs longer than those on the mesonotum, fovea wanting; legs dusky and more-decidedly reddish brown than the other parts of the body; abdomen shining black, the second segment with fine microscopic hairs on its sides anteriorly, the segments distinct and gradually shorter beyond the second anal segment, with a tuft of long hairs; wings rudimentary and not much more than I mm. long. The galls of this species are about 7 mm. in diameter, orbicular, and slightly uneven or pimply, each pimple crested with a tuft of hair-like filaments, pale ash-gray in color but brown or black when weathered; the larval cell is central and is kept in place by a spongy mass that is loosely fibrous on the inner surface of the gall; the cell itself is oval and measures nearly 4 by 4.5 mm.; the shell is very thin and hard; the galls are found as a rule upon the leaves of the white oak (Quercus alba), on the tops of tall old trees. They are said to be rarely abundant but to occur occasionally in great numbers on an isolated tree or in a small grove of oaks. ' p This species may be confused with P. niger Gillette, from which it may, however, be determined by comparison with the above description. P. fulvicollis Fitch. Length: 3 to 4 mm.; mostly black, with the thorax tawny yellow, spotted anteriorly with black, the scutel brighter yellow, and the legs dusky or blackish, with the knees and hips of a paler dull yellowish color; antenna practically entirely black. This species appears on the first snows that fall in the latter part of November and the beginning of December. P. nigricollis Fitch. Length 3 mm.; mostly...show more

Product details

  • Paperback | 308 pages
  • 189 x 246 x 17mm | 553g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236817087
  • 9781236817082