72 NATURAL ARRANGEMENT OF INSECTS. 



Analogies of the Larv^ of the Lepidoptera to the An- 



NULOSA. 



Classes of the Analogies Primary Types of 



Annulosa. Analogies. h\Mm. 



Ptilota. f Pre-eminently typical; innoxO j^/f^^_ 



■* I lous ; and smooth. 3 



Aptera. Hairy or spinous ; often poisonous. Scolopendrijorm, 



CaatPEBES. {""Itrl^l^^''' ''''^''''' '^ ^ Anopluriform. 

 ,. f Both extremities pointed : head > Vermiform, or 



Vermes. J very small. j Onisnform. 



. fHead armed with .opines; body J n,, . ,r^„„ 



Annelides. \ with tail-like appendages. j Thymnunjorm. 



(64.) Let us now inquire into the principle of variation 

 that pervades each of the types of larvae herein described. 

 This demands our particular attention, because, as it ap- 

 pears to us, some erroneous ideas have been entertained 

 on this subject. We have seen that, in one large group 

 of insects, containing many hundreds, perhaps thousands, 

 of species, there are five leading types or forms of cater- 

 pillars ; and that these correspond, and follow each other, 

 in the same order of succession as do the classes and 

 orders of quadrupeds and of birds. But the student, 

 any more than the professed entomologist, must not be- 

 lieve that all the thysanuriform larvne, for instance, go 

 in one of these five divisions ; or that he is to class all the 

 scolopendriform caterpillars together under another di- 

 vision. True it is, that by such an arrangement he would 

 get a uniformity of the same-shaped caterpillars, and he 

 might flatter himself with having discovered the true 

 arrangement of the Lepidoptera; but when he looked to 

 the butterflies which proceeded from his thysanuriform 

 or his scolopendriform larvae, he would find that, so far. 

 from exhibiting the regularity and affinity with each 

 other, which, from looking only to their caterpillars, he 

 had expected, he will be perfectly disappointed. But, 

 to render this clear, let us state a case ; — let us suppose, 

 for instance, he had in his possession the five cater- 

 pillars here represented : he sees that they answer to 

 our description of the thysanuriform type; and, as they 



