108 STATEs OF INsEcts. (Larva.) 
additional segments with other appendages, and nine 
more pairs of feet?. A species of millepede (Julus ter- 
restris), which he also traced from its birth, and which 
begins the world at first with only eight segments and 
six feet, by a successive development at length acquires, 
in its perfect state, 50 segments and not less than 200 
feet’. The nature of these very singular accretions, 
which Latreille and Mr. Wm. MacLeay have also ob- 
served in the centipedes‘, seems not well understood. 
If, as is most probable, though De Geer could not find 
any exuvise‘, the larvee cast a skin before each change, 
they do not essentially differ from the metamorphosis of 
other insects. The legs that these insects thus acquire 
are affixed to the abdomen, the six that they set out 
with being attached to the part representing the trunk, 
so that the former may be regarded as analogous to the 
prolegs of caterpillars. ‘These animals therefore, as I 
have before intimated, invert the order of Nature, and 
from perfect degenerate into zmperfect insects. 
ii. If you examine the cockroach, cricket, or grasshop- 
per, in different stages of their growth, you will find that 
the larva does not vary essentially from the perfect insect, 
except in wanting wings and elytra. ‘The case is the 
saine in almost all the Linnean genera of the modern 
order—Hemiptera; and with Raphidia, Termes, and 
Psocus, in the Neuroptera. Some of these, however, ex- 
hibit slighter discrepancies in the proportion of some of 
their parts, but without affecting the general resemblance. 
* De Geer vii. 576. > Ibid. 584. 
© Considerat. Géner. 21. Hore Entomolog. 353, 
* De Geer, Ibid. Mr. W. MacLeay observes of the Chilopoda, or 
Centipedes, that they moult in the manner of Crustacea. ubi supr. 352. 
