Bulletin of the American Museum of Natural History Volume 24

Bulletin of the American Museum of Natural History Volume 24

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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. 1908 edition. Excerpt: ...Such definition, indeed, could hardly be expected, for this is impossible without extensive studies in the field, because the workers of the same colony sometimes vary greatly in size and color and in some cases even tend to become dimorphic. Another difficulty, which seems not to have occurred to previous observers, arises from the fact that the extraordinary habit of producing honey-storing repletes, rotunds, nurses, or plerergates, as they have been designated by different writers, seems to be entirely absent in certain forms of both species, and that even in the forms in which it has been observed, this habit may, perhaps, be manifested only in particular localities or during certain seasons. These considerations tend to complicate the matter of classification, since the question must arise as to the taxonomic value of the presence or absence of this particular habit. The ants of the genus Myrnurcocg/slits are confined to the warmer and more arid portions of Europe, North Africa, Central Asia and Southwestern North America (Fig. 1). In these xcrothermic regions they may be said to take the place of the more moisture-loving species of F ormica, to which they are very closely related. In fact, the two genera differ only in certain minor characters, such as the greater length in the worker and female Myrmeeocystus of the fourth as compared with the fifth joint of the maxillary palpi and the more parallel frontal carinaa. In many, but not in all, species of the genus the wings of the male lack the discoidal cell, but this is present in the females. Comparison shows that there are certain striking differences between the Old World and North American species. The males of the American forms are small, resemble those of Lasius and have very...show more

Product details

  • Paperback
  • 189 x 246 x 14mm | 467g
  • Rarebooksclub.com
  • English
  • Illustrations, black and white
  • 1236908449
  • 9781236908445