614 TAXONOMY. 



b. Mouth without mandibles. 



a. a. Without a bent proboscis. 5. Order. Hemiptera. 



b. b. A spirally rolled proboscis. 6. Lepidoptera, 

 B. Two wings. 7- Diptera. 



II. Insects without wings. 8. Aptera. 



a. Six legs. 



a. a. Mouth a proboscis. 1. Family. Rhinaptera 



(lice and six-legged Acari). 



b. b. Mouth with mandibles, ab- 2. Family. Ornithomyzce 



dominal apex without setae (genus Ricinus, De 

 and appendages. Geer. 



Mouth with various append- 3. Family. Nematurce 

 ages. {Lepisma, PoduraJ. 



b. Eight legs. No antennae. 4. Family. Accra. 



c. More than eight legs. 



a. a. Body with many segments., each 



bearing a pair of legs. 5. Myriapoda. 



b. b. Body with fewer segments, 6. Polygnatha 



fourteen pairs of legs. (Oniscus&t Armadillo). 



The author, besides, endeavoured to reunite more naturally, and by 

 other principles, the families that had been so monstrously subdivided, 

 and to reduce, especially, the host of genera, which, as his work was to 

 serve as a general introduction to the natural history of insects*, is very 

 much to be praised. 



348. 



The whilst these systems were being sketched by the French, 

 English naturalists likewise occupied themselves with entomology. 

 Among these there aro especially three which well merit mention, 

 namely, Leach, Kirby, and Macleay. The system of the last is 

 founded upon philosophical principles, and which we will therefore 

 examine last. Leach sketched the following system f . 



I. Insects without a metamorphosis. Ametabola. 



A. Abdominal apex with setae. 1. Order. Thysanura. 



B. without setae. 2. Anoplura 



(Parasita, Lat.), 



* Considerations Gen^ralcs sur la Classe dcs Inscctes. Paris, 1823. 8vo. av. fig. 

 f Zoological Miscellany, vol. iii. p. 57 GO. 



