52 BRITISH GALLS 



lump of resinous matter. Similar exudation occurs at the 

 aperture of burrows in this tree made by certain lepidop- 

 terous larvae that are usually classed as gall-causers; but 

 the absence of hypertrophy of the branch around the 

 burrow and of excrement within, Serve at once to distinguish 

 the burrow of H. piniperda from that of a caterpillar. 



Pseudo-Galls 



A few beetles roll up parts of living leaves into marvellous 

 little pouches or rolls for the reception of their eggs. It is 

 possible that such productions may be mistaken by some 

 observers for true galls, but they are outside the domain 

 of the cecidologist. One of the most remarkable of these 

 pseudo-galls is that made by Atielabus curculionoides from 

 the apical half of the Sweet Chestnut leaf. It is a minute 

 cylinder, about 8 by 4 mm. ; it hangs from the other half of 

 the leaf, supported by the midrib only. Each cylinder 

 contains a golden egg. 



