xvin INSECTA: ORTHOPTERA 275 



the body can then be examined, and the spiracles down each side 

 of the body detected. There are ten pairs of these altogether, the 

 largest being those on the second and third thoracic segments. 



2. Earwigs, Grasshoppers, etc., should be looked for out-of-doors 

 and their habits studied. 



3. A visit should be made to a museum where there is an 

 exhibit of Leaf and Stick Insects, and their curious adaptations 

 noted. These observations should be used in a more general study 

 of " Protective Coloration and Mimicry in Insects," to be made 

 after completing the course of work suggested in this book. 



