368 



THE LOCUST 



auditory orga.n on the 

 fore limbs. Again, in mos- 

 quitos, certain hairs on 

 the antennae of the male 

 are regarded as auditory, 

 because they may be 

 caused to vibrate sympa- 

 thetically to the note of a 

 tuning fork that is ap- 

 proximately the same as 

 that of the hum produced 

 by the wings of the fe- 

 male. In nature, it is 

 probable that the male 

 adjusts its flight so that 

 the two antennae are 

 stimulated alike, and thus 

 by flying straight ahead 

 is able to locate his mate 

 with precision. 



In addition to the or- 

 gans enumerated, there 

 are many structures in 

 insects that are presmiied 

 to be sense-organs be- 

 cause of their structure 

 and nervous connections. 

 This raises the question 

 whether some insects 

 may not possess sensory 

 mechanisms that enable 

 them to receive stimuli 

 to which human beings 



Fig. 188.— Develupment of locust after give no response. Ants, 

 hatching. for example, respond to 



The animal hatches from the egg (c/. Figs. 187 ultra-violct rayS, tO which 



and 189) in an immature condition and grows to TY-iori jo insprmihlp Ppr- 



adult size by a series of molts (cf. Fig. 169) as shown . . 



by A to F of this figure. (After Packard, from hapS there are Stimull 



Linville and Kelly, "Textbook of General Zoology," '^^ the UnivcrSP " 

 copyright, 1906, by Ginn & Co., reprinted by per- i <• • 



mission.) dreamed oi in our phi 



un- 



