ii. j METAMORPHOSES OF INSECTS. 29 



apod larvae, and that the present apod condition oi' 

 these larvae is not original, but results from their 

 mode of life. 



On the other hand, the larvae of Sirex (Fig. 14) 

 being wood-burrowers, possess well-developed tho- 

 racic legs. Again, the larvae of the Tenthredinidae, 

 which feed upon leaves, closely resemble the cater- 

 pillars of Lepidoptera, even to the presence of 

 abdominal pro-legs. 



The larvae of most Coleoptera (Beetles) are active, 

 hexapod, and more or less flattened : but those which 

 live inside vegetable tissues, such as the weevils, are 

 apod fleshy grubs, like those of Hymenoptera. PL II., 

 Fig. 6, represents the larva of the nut-weevil, Bala- 

 ninus (PL I., Fig. 6), and it will be seen that it closely 

 resembles PL II., Fig. 5, which represents that of a fly 

 (Anthrax), PL I., Fig. 5, and PL II., Figs. 7, 8, and 9, 

 which represent respectively those of a Cynips or 

 gall-fly (PL I., Fig. 7), an ant (PL L, Fig. 8), and wasp 

 (PL I., Fig. 9). Nor is Balaninus the only genus of 

 Coleoptera which affords us examples of this fact. 

 Thus in the genus Scolytus (PL L, Fig. 4), the larvae 

 (PL II., Fig. 4), which, as already mentioned, feed on 



6 



FIG. 7, Larva of Brachy tarsus (Ratzeburg, Forst Insecten). 8, Larva of Crioceris 



(Westwood, loc. cit.). 



the bark of the elm, closely resemble those just de- 

 scribed, as also do those of Brachytarsus (Fig. 7). On 

 the other hand, the larvae of certain beetles feed on 



