96 NATURAL ARRANGEMENT OF INSECTS. 



and its general aspect immediately reminds us of an Onis- 

 cus, or wood louse. In general it is naked (fig. 5. c) ; but 

 in some of the Oriental species ( Theda Jurbus Hors.) it 

 is hairy, and in others (T. longinus Hors. fig. 5.) the sur- 

 face is much wrinkled. In Erycina, the hairs sometimes 

 assume the appearance of tufts ; and in the only species 



(e) of which the larva has been figured, there are two 

 horns near the head (a). Much, however, remains to 

 be discovered respecting the transformations of this 

 diversified group. 



(88.) The pupa differs essentially from that form 

 so generally prevalent in the last family: it is short, 

 thick, and obtuse, attached by the tail, and, in all the 

 European and American groups, braced by a transverse 

 thread (fig. 5. d). It seems, however, from the figures in 

 the Javanese Catalogue (pi. 4. figs. 1. 3, 4, 5.), that several 

 of the Oriental species are merely suspended with the 

 head downwards, without any transverse brace. Is not 

 this an error of the engraver ? 



(89.) The separation of the Erycinidce from this 

 family, merely because the larva of the only species 

 whose transformation is known, is furnished with two 

 horns like some of the thysanuriform caterpillars, ap- 

 pears to us highly objectionable, because it is in no 

 degree sanctioned by the structure of the perfect insect. 

 It is almost impossible to bring into contact two more 



