I' I. \SllI.HillTS ON N AH Kl. 



Fig. A, vibrate synipathctically in unison with the 

 notes of a tuning-fork, within the range of the 

 sounds emitted by the female. In other words, 

 hairs and drums just answer to one another. We 

 may, therefore, reasonably conclude that the female 

 sings in order to please and attract her wandering 

 mate, aud that the antenna; of the male are organ.-, 

 of hearing which catch and respond to the buzzing 

 music she pours forth for her lover's ears. A whole 

 swarm of gnats can be brought down, indeed, by 



uttering the appro- 

 priate note of the 

 race ; you can call 

 them somewhat a^ 

 you can call male 

 glow-worms by 

 showing a light 

 which they mistake 

 for the female. 

 A much larger 



NO. 10. THE GADFLY, NATURAL SIZE. and mQre p owe rftll 



British bloodsucker 



than the mosquito, again, is the gadfly or horse- 

 fly, whose life-size portrait Mr. Enock has drawn 

 for us in No. 10. Most people know this fear- 

 some beast well in the fields in summer. He 

 has a trick of settling on the back of one's neck, 

 and making a hole in one's skin with his sharp 

 mandibles ; after which he quietly sucks one's blood 

 almost without one's perceiving him. Horses in 

 pastures are often terribly troubled by these per- 

 sistent creatures, which make no noise, but creep 



