148 ECONOMIC ZOOLOGY AND ENTOMOLOGY 



of flowers or drink water from little 

 pools or damp places. They take no 

 other food. There is a pair of tufted 

 maxillary palpi which rise from each 

 side of the base of the sucking tube 

 and between which the tube, when not 

 in use, is compactly coiled. 



Some moths and butterflies have 

 their mouth-parts wholly atrophied 

 and take no food in their adult condi- 

 tion. This is true also of numerous 

 insects of various kinds. Such kinds 

 of insects usually live but a short time 

 in adult condition, and use up during 

 this short time the fat stored in the 

 body during the immature life. The 

 moths and butterflies, for example, 

 are extremely voracious feeders in their 

 young or caterpillar stages. At this 

 time, too, they have mouth-parts of 

 very different type from 

 those possessed in adult 

 life. A caterpillar's 

 mouth-parts are of bit- 

 ing type with strong 

 cutting and crushing 

 mandibles and the food 

 is the tissues of plant 

 leaves and stems. Thus 

 it is important in the 

 study of insect mouth- 

 parts to recognize that 

 they may be very differ- 



FIG. 6 4 .-Sphin X moth, showing pro- Cnt . in the Same insect 

 boscis. At left the proboscis is shown at different times of its 

 coiled up on the underside of the head, the life, and that, therefore, 

 normal position when not in use. (Large <.!, 

 figure natural size; small figure twice natu- the m junes caused by 

 ral size.) an insect, and the rem- 



