INSECTA. 



289 



off its last skin, and becomes a quiescent pupa ; but while in tins 

 state the position of the rudiments of the wings and other appen- 



Fi,J3l. 



dages of the perfect insect is strongly indicated upon the exterior of 

 the chrysalis (A), though these parts are still closely wrapped up in 

 the external covering. 



(337.) The third form of metamorphosis, called incomplete, is 

 seen in the Hymenoptera, and in many Coleopterous insects. The 

 maggot, in such tribes as exhibit this kind of change, is sometimes a 

 simple worm deprived of feet or other external organs, or in other 

 species these parts exist in a very imperfect condition ; in the pupa, 

 however, the form of the legs and antennae is perfectly distinct, and 

 even the wings may be seen as rudiments projecting from the thorax. 

 This kind of chrysalis we have seen in the cockchafer (fig. 106, B), 

 in which the grub (c) possessed feebly developed legs ; and in the 

 hive-bee, although the larva (Jig. 132, a, c, d, e,f) has no legs or 

 exterior appendages, in the pupa (b) all the limbs of the perfect 

 bee are recognised with the utmost facility. Yet all these organs 

 are still enclosed in distinct cases (thecte), to each of which names 

 have been applied by entomological writers ; and it is only on 

 throwing off the integument which thus imprisons the mature in- 

 sect, that the bee makes its appearance in a capacity to begin its 

 active and industrious existence in the winged state. 



u 



