STATES OF INSECTS, 181 



are planted singly, but in some caterpillars in bundles. 

 In that of Satumia Io, on each segment there are six bun- 

 dies of longish, quill-shaped, sharp, slender, diverging 

 spines, which also appear to sheath aculei. Madame 

 Merian has figured this larva, or one very near it, as the 

 grub of a Euglossa a , with which, though she affirms she 

 traced it to the fly, it can have no connection. With re- 

 gard to number, some larvae have only four spines on 

 each segment; others five, others again six, and others 

 seven, or even eight : they are planted on the sides and 

 back only, never on the belly. They are often more nu- 

 merous on the intermediate than on the anterior and 

 posterior segments; but sometimes the reverse of this 

 takes place ; in that of Attacus Erythrince only the head 

 and tail are armed with spines, the rest of the body being 

 without any b ; and in that of Morpho Teucer there is 

 only a single spine on the four intermediate segments c . 

 They are usually all nearly of equal length ; but in some 

 cases those of the head and tail are much longer than 

 the rest, and remarkably so in the caterpillar of Urania 

 Leilus, also beautifully plumose, and gracefully waved d . 

 Those in the second and third segments are much longer 

 than any of the rest in that of Bombyx regalis ,- which 

 circumstance gives it the terrific appearance lately al- 

 luded to. In the family to which Argynnis Paphia be- 

 longs, the larva is adorned with two on the back of the 

 first segment twice as long as the rest, and resembling 

 at first sight two antennas. 



The spines, as well as the hairs of the new skin, are 

 concealed under the old one, and not incased in its spines ; 



a Ins. Sur. t. xlviii. right hand figure, b Ibid. t. xi. 



c Ibid. t. xxiii. d Hid t, xxix. 



