THE WALKING STICK. 31 



Make a table in the following form, stating the 

 resemblances concerning the eyes, antennae, etc., of 

 the grasshopper, cricket, katydid, and walking stick. 



all have two compound eyes 



all have one pair of antennae 



all have tveo pairs of jaws 



jaws move sideways 



have three body divisions 



three thoracic segments 

 Grasshopper | t'^'O pairs of wings (except the walking stick) 

 Cricket / three pairs of legs 



Katydid \ segmented abdomen 



Walking Stick J all lay eggs 



jointed appendages 



incomplete metamorphosis 



external chitinous skeleton 



white blood 



double nerve cord and ganglia 

 , breathe by spiracles 



There are two other families which are very simi- 

 lar to the insects previously studied. These are the 

 Blattidse, represented by the Cockroach, and the Man- 

 tidse, represented by the praying Mantis. All these 

 families are so much alike that they are grouped 

 together, and the group is called an order. The name 

 of the order is Orthoptera. The name means straight 

 wings, and the order was named from the outer wings 

 of the grasshopper. The name is not a good one, for 

 the walking stick has no wings at all, but is so much 

 like the grasshopper in other respects that it must be 

 put into the same order. The Orthoptera all Imve 

 biting mouth parts and incomplete metamorphosis. 



