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 Retini of De Geer. 



4. Acephales. Spiders, Scorpions, and Acari. 



5. Entomostraces. Cypris, Daphnia. 



6. Crustaces. Kleistagnathes and Exochicrtes, Fabr. 



7. Myriapodes. Scolopcndra, 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 characters 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 superseded by these, it is still of great interest, 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 I'Ent., torn. ii. p. GGO. 



