Bulletin of the American Museum of Natural History Volume 35

Bulletin of the American Museum of Natural History Volume 35

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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. 1916 edition. Excerpt: ... or subfamily "Cuterebrinas," although, apart from the deep oral slit containing the rudimentary geniculate proboscis, I was unable to find any peculiar character. Probably we must include in the same group the genera Rogcnhofcra Br. and Bogeria Austen, and perhaps also Pscudogametes Bischof; but these three genera are, thus far, unknown to me. Returning now to the larvae of Cuterebra, their morphological characters apparently do not give any indication as to the systematic position of these parasites. So far as I am aware, these larvae are only described in the third stage, and in this stage their general structure is, at first glance, very similar to that of most cuticolous larvae, even of distant relationships, and this results, I suppose, merely from convergent adaptations. I must refrain, however, from any detailed discussion of the Cuterebra larvae, but I think that a comparison of these parasites with the dipterous larvae from the foot of the African Elephant will not be without interest. As to the external morphological characters, Neocutcrebra and Cuterebra look very much alike indeed. Their general aspect and shape are the same. They present the same peculiar structure of the posterior end of the abdomen. In Ncocuterebra the twelfth segment is very small, smaller indeed than in the Cuterebra larvee I have examined, and completely retracted in the eleventh. The mouth-hooks are also very slender and probably functionless. Furthermore, the spinu.lation is formed by the same flattened, scale-like spines, covering nearly the whole of the body; in both genera intermediate median fields between the segments are completely lacking. With regard to the longitudinal pads on the sides, I do not think there is so much difference...show more

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  • Paperback
  • 189 x 246 x 13mm | 458g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236812832
  • 9781236812834