102 INSECTA 



2. The Thorax. 



(1) Shape? 



(2) Size compared with the head? 



(3) Size compared with the abdomen? 



(4) Covering? 



(5) Divisions. In the grasshopper the thorax has three 



divisions. Has this insect's thorax three divisions? 



(6) The Legs. 



(a) Number of pairs? 



(b) Are they of the same size, or do they vary? 



(c) The segments in order, beginning at the body are: 



coxa, trochanter, femur, tibia, tarsus, or foot. 

 Sketch one leg, much enlarged, and name the parts 

 present. 



(d) Compare first pair of legs with second pair, segment 



for segment, noting similarities and differences. 



(e) Compare second and third pairs. 



(7) The Wings. 



(a) Number? 



(b) Location? 



(c) Color above? 



(d) Color below? 



(e) Covering scaly, smooth, or hairy? 



(f) Anterior and posterior wings equal in size? 



(g) Anterior and posterior wings of same thickness? 

 (h) How folded when at rest? When in motion? 



(i) Wings analogous or homologous to the wings of a 

 bird? 



(j) Sketch the wings extended, putting in all the mark- 

 ings. 



3. The Abdomen. 



(1) Shape? 



(2) Size compared with the thorax? 



(3) Covering? 



(4) Number of segments? 



(5) Ovipositor present or absent? 



(6) Sting present or absent? 



(a) Why? 



(b) Why not found in all insects? 



