22 Beautiful Butterflies. 



in a circle; they are placed in the fore part of the 

 upper side of the head, and are therefore not seen in 

 the cut. The antennce, or horns, although usually 

 large in the perfect insect, are small in the Lepidopte- 

 rous larvae, being composed of two or three short joints, 

 fitting into each other, like the tubes of a telescope, 

 like which, too, they can with some species be drawn 

 in, so as to be almost imperceptible ; the letters a a 

 point out their situation in the cut. 



You will have noticed that Caterpillars differ very 

 much in appearance ; — some being smooth, and others 

 rough and hairy ; with some again the hairs are long 

 and silky, with others short and harsh; some have 

 them in tufts placed at regular intervals along the 

 back or sides of the body ; indeed they are seldom, if 

 ever, irregularly placed ; but whether few or many, a 

 certain order of arrangement may be observable in the 

 little tubercles, or lumps, from which they spring; 

 these tubercles are placed in rows across the middle of 

 the segments, and each segment is armed — for the 

 spines may be considered as defensive armour — with a 

 transverse, that is, a crosswise, series, varying in number 

 from four to eight. The mode of arrangement and 

 structure of these spines is exhibited in the section 

 here given of a not uncommon species of British Cater- 

 pillar. 



Why some Caterpillars should be hairy and others 



