STATES OF INSECTS. (Larva.) 171 
Type. The Ametadola also furnish the prototype of the 
next tribe, the Termitina, which, as is evident both from 
Psocus and Termes, are perfectly Anopluriform. The 
Sialina, or Plicipennes of Latreille, excluding the 7Z77- 
choptera appear to me to be intermediate between the 
Chilopodiform and Stomapodiform Types, and not with- 
out some relation to the Thysanuriform. Their pediform, 
jointed, respiratory abdominal appendages, their head 
and falcate mandibles, seem copied from the first tribe. 
Thesame appendages considered as organs of respiration, 
and their taper forks, are moulded upon the plan of the 
Stomapodiform Crustacea, and the long seta which ter- 
minates the abdomen is upon the Thysanuriform plan *. 
Trichoptera. ‘The larvee of this order appear also to 
~be constructed upon a double plan. ‘The respiratory 
threads observable in both the upper and under sides of 
the abdomen connect it with the Stomapoda, and its cy- 
lindrical elongate body with Chilognathiform types in the 
Lepidoptera”. 
Lepidoptera. ‘The great majority of larvee in this or- 
der are Chilognathiform, but there are exceptions to this 
remark. ‘Those of the Geometre recede from this type, 
both in their motions and in the distance and number of 
their legs. In both these respects they represent the 
Lemodipoda in the Crustacea®. Other caterpillars are 
Onisciform ; and a third sort seem to leave the Annulose 
type, and imitate that of the Mollusca, and one is figured 
* De Geer ii. ¢. xxiii. f. 9—14. Comp. Reaum. iv. é. xv. f. 1, 2. 
» De Geer ii. ¢. xiv. f. 7. &c. The caterpillar of Hydrocampa Stra- 
tiotata L like those of Phryganea, has these respiratory threads. Ibid. 
i. ¢, xxxvii. 7. 2—6. De Geer has described the larva of a Phryganea 
L. which is without any respiratory threads, ii. 569. ¢. xv. f. 10. 
© Hor. Entomolog.401. Montagu in Linn. Trans. vii. 67. 
