GENERAL CHARACTERISTICS. 



21 



tractor linguaB muscle, which, as it contracts, diminishes the 

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

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



Fig, 12. 



TOXGUE AXl) APPENDAGES. 



(Magnified. After Barbo.) 



a, tongue ; b, 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 tlii lining by a 



