20 



INTKdDllC'llON TO ZciOIjOGY. 



AIR TUBES (TRACFF,.4i:) oK <;RAS.S- 

 HUPPER. 



The trachea' Ijvanch freely 

 and ramif_y throughout all 

 parts of the body. Each trachea 

 appears to be composed of a 

 fine thread wound spirally 

 around the tube. 



MUSCLE KlliKHS !■ lii iM THfiRAX OF 

 <;l{ASSIhiP(>KK. 



The muscle is composed of 

 slender fibers, each of -which is 

 marlved by the transverse 

 striaB, Avliicti are always consid- 

 ered indicative of v(duntary 

 muscle. 



The Young' Grasshopper. 



1. Examine the young grasshopper as you did tlie 

 old one. 



2. Notice tlie body divisions, head, antenna', eyes, 

 ocelli, labrum, mandibles, labium, laljial pali)i, max- 

 illa', maxillary palpi, thorax, wings, legs, abdomen, 

 spiracles, and ears. 



3. Find, especially, differences in the eyes, wings, 

 and legs. 



Suggested l';;x:iiiiiiiatioii (^lu'stioiis oii the (jrasshopper. 



1. How many ])ody segments in the body of a 

 grassho[)per? 



2. Name all the mouth parts of a grasshopper. 



3. Draw the leg, naming all parts. 



