336 PHYSIOLOGY AND MORPHOLOGY OF ANIMALS. 



pulled out; B, a section of the whole when the inner 

 tube is in place. The bee, therefore, both bites and 

 sucks. If the nectary tube of a flower is too long to 

 reach the nectar with the sucker, he bites the nectary 

 and reaches the honey more directly. 



Digestive Apparatus.— Fig. 219 shows the whole 

 digestive apparatus of a beetle. In Fig. 220 we give 



r-rnt. 



Fig. 219. — Digestive apparatus of a bee- 

 tle : m, mandibles ; a, antennae ; a?, 

 oesophagus ; c, crop ; prv, proventricu- 

 lus ; st, stomach ; bd, biliary ducts ; d, 

 duodenum ; /', intestines ; r, rectum ; 

 agl, anal gland. 



Fig. 220. — Digestive system 

 of a Belostoma : //, head ; 

 a?, oesophagus ; sg, salivary 

 gland ; sr, salivary recepta- 

 cle ; st, stomach ; mt, Mal- 

 pighian tubes ; c&, caecum. 

 (After Packard.) 



