MEMOIR OF LATREILLE. 25^ 
in the classification of true insects, is the addition of 
Orthoptera to the orders of the Swedish naturalist ; 
but the order Aptera of the latter is divided into the 
seven following : — 
1. Suceurs. Pulex. 
2. Thysanoures. Lepisma and Podura. 
3. Parasites. Pediculus with the Recini of De Geer. 
4. Acephales. Spiders, Scorpions, and Aoari. 
5. Entomostrace's. Cypris, Daphnia. 
6. Crustaces. Kleistagnathes and Exochnates, Fabr. 
7. Myriapodes. Scolopendra, Julus^ Oniscus, «&c. 
The order Aptera was therefore entirely suppressed, 
but this had previously been done by Fabricius; 
and the most remarkable feature in the work was 
the selection of the characten on which the new 
orders were founded, and their division into natural 
families. * In fact it "formed the germ of what was 
afterwards so fully developed in Latreille's various 
publications; and although, of course, completely 
superseded by these, it is still of great interest, 
when viewed in relation to the history of entomo- 
logical science. 
It has already been mentioned that Latreille 
was exposed to much persecution in consequence 
of being regarded as a member of the ecclesiastical 
body. The dates which we have incidentally given 
will at once apprise the reader that about this time 
the French revolution was at its height. All the 
* Lacordaire's Introd, a TEnt., torn. ii. p. 660. 
