GENERAL CHARACTERISTICS. 



21 



tractor lingua? muscle, which, as it contracts, diminishes the 

 space above the salivary valve, and so pumps out the saliva, 

 vrhich mixes with the nectar as it rises, by methods we now 



Fig. 12. 



TONGUE AND APPEXDAGES. 



(Magnifled. After Barba.) 



a, tongue ; h. labial palpi ; c, maxilla. 



understand. Bees, it has often been observed, feed on thick 



syrup slowly; the reason is simple. The thick syrup will not 



pass readily through minute passages without tliinniiig by a 



