CLASS INSECTS. 



417 



performing the functions of little lancets, and formed of the 

 mandible and jaws, extremely modified. 



In bees, in the anthophora, wild bee, the bourdon or 

 solitary bee, and other insects, 

 called by zoologists hymenoptera, 

 the buccal apparatus presents a 

 disposition in some measure in- 

 termediate between these two ex- 

 tremes. The upper lip (a, Fig. 437) 

 and the mandibles (b) greatly 

 resemble those of the grinding in- 

 sects ; but the jaws (c) and the 

 languette (d) are extremely elon- 

 gated, and the first assume a 

 tubular form longitudinally, en- 

 casing the sides of the languette, 

 so that these organs, reunited 

 into bundles, form a proboscis, 

 serving to conduct the food, 

 always soft and liquid, on which 

 these insects live. This proboscis 

 is moveable at its base, and 

 flexible throughout the rest of its extent, but it is never 

 rolled up, as we see in the butterfly. With regard to the 



Fig. 437. 



Fig. 438. The Wood-Bug. 



Fig. 439. Buccal Apparatus of a 

 Hemipterous Insect. 



ET7I 

 JS 



