COMPARISONS. 



With two columns, one for grasshopper, squash-bug, 

 beetle, and butterfly, and the other for crayfish and sow- 

 bug, answer the following questions :* 



1. How many pairs of antennae ? 



2. How does the animal breathe ? 



3. How many segments in the head-region ? 



4. How many walking-feet ? 



5. Are there appendages on the abdomen ? 



6. Where are the reproductive openings ? 



7. Are any appendages two-branched ? 



* If the points have not been made out for all forms, answer for 

 those about which you know. 



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