106 INSECTA 



7. Appendages. 



(1) How many, and what? 



(2) If there are body divisions, how many appendages are 



there — 



(a) On the thorax or cephalothorax? 



(b) On the abdomen? 



8. Respiration. By means of what? 



9. This arthropod has the following class characteristics: 

 (Name the characteristics you have discovered and compare 

 with those given in the text.) Hence, it belongs to Class 



ORDINAL STUDY FOR CLASS INSECTA 



Use insects of different orders for this study. 



1. Mouth-parts. 



Are they adapted for biting, sucking, or lapping, or for 

 any two of these processes? 



2. Thorax. 



(1) Are the divisions prothorax, mesothorax, and meta- 



thorax distinct? 



(2) If not, how do you account for differences discovered? 



(3) Wings. 



(a) Number? 



(b) Shape? 



(c) Membranous, thick, or scaly? 



(d) Similarity. 



(1) If there are two pairs, are the anterior and posterior 



pairs equal in size? 



(2) Are they of the same thickness? 



(e) Covering. Naked or covered with hairs or scales? 



(f) Position. 



(1) Folded when at rest? If so, how? 



(2) Folded when in motion? 



(g) Any other ordinal characteristics of wings? 



(4) The Legs. 



(a) Strong or weak? Why? 



(b) Similarity. 



(1) Are the legs alike in shape and size? 



(2) Any adaptations? 



(c) Feet. Clawed? Padded? 



