27 

 are aborted. The laminse of the maxillse are transformed 

 into two immensely long, hollow, rounded filaments provided 

 with semi-circular grooves on their inner surfaces, thus 

 forming a tube when placed in close apposition. In a state 

 of rest this tube is spirally coiled and concealed between the 

 labial palpi. This account of the insects is mainly taken 

 from Mueller's work. The chief pollinators of the Lepidop- 

 tera are the butterflies, moths and hawk-moths. The butter- 



FIG u. 



flies are diurnal visitors, and when on the wing flutter to and 

 fro; when on the flower their wings are folded back. (Fig. 

 13 A). The moths and hawk-moths are nocturnal visitors. 

 Moths do not take a position like butterflies when collecting 

 honey, but hover over the flowers with their wings in rapid 

 motion. Some of the Sphingidae or hawk-moths have very 

 long tongues. A species found in Brazil has a tongue 

 between ten and eleven inches long. In the United States 



