. The Cambridge natural history. Zoology. 552 HYMENOPTERA frequently covered with a highly-developed sculpture. The hind body springs from the lower part of the propodeum ; it is usually of slender form, and its segmentation is very conspicuous. The females bear an ovipositor, which differs greatly in length accord- ing to the species, and is known in the case of one species to attain a length six times that of the whole of the rest of the The egg is deposited by some species on the skin, by others within the body of the victim ; it varies much in form and colour, some eggs being stalke
. The Cambridge natural history. Zoology. 552 HYMENOPTERA frequently covered with a highly-developed sculpture. The hind body springs from the lower part of the propodeum ; it is usually of slender form, and its segmentation is very conspicuous. The females bear an ovipositor, which differs greatly in length accord- ing to the species, and is known in the case of one species to attain a length six times that of the whole of the rest of the The egg is deposited by some species on the skin, by others within the body of the victim ; it varies much in form and colour, some eggs being stalked and of peculiar shape. The larvae issuing from the eggs are legless maggots with a delicate integument of pallid white or creamy colour. If the eggs are laid on the surface of the body, the result- ing larvae (except in the cases of the external parasites) soon bore into the interior of their victim, and disappear therein. The changes that take place in the lifetime of the larvae have been studied in only a few cases; but if we can judge from Eatzeburg's history ^ of the changes that take place in Anomalon, they are of great interest. From observation of the differences existing amongst a great number of larvae of A. circumfiexum he distinguished four stages. It is of course impossible to follow directly the growth of one individual, be- cause it is concealed in the interior of the caterpillar in which it lives, and to open this involves the death of both caterpillar and Ichneumon- larva. The life history must therefore (After Ratzeijurg.) A,' First be Constructed from a great number of instar ; B, secondinstar: C, the „„„„ *„ i, i -i. • j. larva in the third or eJicysted Separate observations; and It is not stage from its cyst; ascertained that the four instars de- D, the mature larva : E, pupa. -i j i n ^ i , j i scribed by Katzeburg represent the number of moults of the larva that actually take place. He, however, entertained no doubt that all th
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
