26 A MANUAL OF ZOOLOGY . 



thorax; the second or Intermediate, the mesothorax; and 

 the third or caudal, the metathorax. These divisions 

 can be easily ^-ecognized by the appendages they bear. To 

 the first segment is attached the first pair of legs; to the 

 second is joined the second pair of legs and the first pair 

 of wings; and to the third or metathorax, the thiri pair 

 of legs and the second pair of wings. On the dorsal part 

 of the prothorax note the sunbonnet shaped piece, the pro- 

 notum which covers the greater part of the sides as well 

 as the dorsal part of this segment. Make a drawin g^ of 

 t he lateral agpg ct of t hS-Pronotum. fte two segments, 

 known as the metathorax and the mesothorax, are firmly 

 joined together forming a box to which two pairs of 

 yings and the second and third pairs of legs are attached. 

 The dorsal part of the mesothorax is termed the meso- 

 noturfl, that of the metathorax the metanotum. Examine 

 the vetral aspect of the first pair of legs. Elach leg will 

 be found to consist of the following parts: the proximal 

 segment, the' coxa; the second segment, the trochanter. 

 This is smaller than the Coxa. The third segment, the 

 femur, is the principle segment of the leg. The fourth 

 segment, the tibia, nearly equals the femur in length but 

 is more slender. The tarsus includes all that part distal 

 to the tibia. On the ventral surface of the tarsus note 

 the series of cushions, the pulvllll. Make drawing of ong 

 of the_legs^ Name the parts. "" — ^~- 



The long parchment like wings are found on the 

 mesothorax and are known as the mesothoracic wings. 

 The large fan-shaped wings, folded under the mesothoracic 

 wings are the metathoracic wings, and are the most im- 

 portant for locomotion. Compare the texture of these 

 two pairs of wings. JMake a drawing to represejit on6- of 

 each pair,- What seems to be the function of the front 

 pair^'of wings? 



Note the number of segments in the abdominal region. 

 Owing to the complexity of the caudal region, there is 

 a difference of opinion as to the number of segments, 

 but eight segments are readily distinguished in the female 

 and nine in the male. On each side on the dorso-lateral 

 region of the first segment find a large opening closed 

 by a very delicate membrane. The whole is the auditory or- 



