HISTORY OF ENTOMOLOGY. 463 
Arachnida, the Polypod, and some of the Octopod and 
Hexapod Aptera ; and his Aptera—Pulex, Pediculus, and 
Acarus L., with the exclusion of Hydrachna F.* It is 
remarkable enouch that his Class as it stands, with a 
slight alteration, returns into itself, thus forming a circle; 
for his first Order (Gnathaptera) contains Hydrachna 
.and the Thysanura of Latreille, and his last (Aptera) 
ends with Anoplura Leach, and Acarus L. 
All the French Entomologists have followed Olivier 
and Latreille in adopting, with some variation, Geof- 
froy’s system with regard to the Coleoptera, which has 
rendered them all more or less artificial. Dumeril has 
constructed a table of the Order, arranged differently 
from that above given” of Latreille; but not more na- 
tural, for the very same reason. 
Our learned countryman, Dr. Leach, by his zoolo- 
gical labours has thrown much light on the natural dis- 
tribution of the Animal Kingdom, and no department 
of that kingdom is more indebted to him than the 
Annulosa ; of which I have before stated to you his 
Classes*. I shall now give a table of his Orders of Arach- 
nida and Insecta Latr. and also his families, &c. of his 
Classes Myriapoda and Arachnides4. 
Cuass. OrpER. Famity. 
Glomerides. 
Chilognatha .... Iulides. 
{ - Polydesmides. 
Myriapoda Cermatides. 
Seas ocer suse ae 
Syngnatha ...... Scolopendrides. 
Geophilides. - 
Anat. Comp. 1. t. viil. 
> Expos. dune Meth. Nat. 17. 
© Vou. TIT. p. 19. 
4 Linn. Trans. xi. 376. N.B. I have transferred from the Arach- 
nida his suborder Noftostomata, as he subsequently placed it at the 
end of Insecta, under the Omaloptera. 
