ERRATA. 



Page 10, fig. 20, line 8, for circulation read nutrition. 



Page 54, fig. 108, line 7, for diluted potassa fusa, read in a diluted solu- 

 tion of potassa fusa. 



Page 63, fig. 126, line 7, for therefore &c., read therefore each of the 

 facets receives an image of the object before them. 



Page 64, fig. 128, line 9, for the rasp-like bodies in &c., read the rasp- 

 like bodies of the male insect in the &c. 



86, fig. 171, for Order Acarind read Order Acarina. 



