STICK-CATERPILLARS. 211 



when I only looked at him. He changed to a 

 handsome dark brown moth (Patula Walkeri), 

 with a large eye in centre of fore-wing slightly 

 tinted with red and indigo, measuring five 

 inches across the wings. 



Some stick caterpillars have lumps and excres- 

 cences on them like thorns or knots in bark, 

 making them still more difficult to discover ; but 

 indeed the whole protective resemblance system 

 in the insect world is so wonderful and perfect 

 that a collector often feels inclined to grumble 

 at it for its very perfection. 



