118 



FIRST LESSONS IN ZOOLOGY. 



are usually absent. Moreover, the butterfly needs little food; 

 it only lives long enough to lay its eggs, when it dies. 

 How the tongue is formed and how it works is well worth 

 It should be borne in mind that it is formed by 



knowing. 



FIG. 128 Front view of head of butterfly, oc, compound eyes; a, antennee; cl 

 clypeus; Ib, labium; <fc, maxillae or " tongue." (Magnified 10 times.) 



the two accessory jaws (maxillas), which unite to form a 

 tube. By looking at our specimen after the scales have 

 been rubbed off the head, which may be done by a stumpy 

 hair-pencil, it will appear somewhat as in Fig. 128 of the 



ant. 



FIG 129. Section of butterfly's " tongue," the two maxillae uniting to form the 

 food-passage c; tr, trachea; ?i, nerves; m, muscles of one side. (Magnified 

 125 times.) 



Archippus butterfly. This represents a front view of the 

 head: cl is the front or visor, and 11 indicates the upper 

 lip; tk is the tongue, cut off to show the tube in the mid- 

 dle. An idea how it works can be seen by looking at 



