CHIEF ENT03IOLOGICAL CLASSIFICATIONS AND SYSTEMS. 613 



I. Insects with suctorial mouths. 



1. Order. Aptera (merely the genus Pulex, Suctoria, Lat.). 



2. Diptera (besides the Diptcra, the order Rhiphiptera, 



Lat., also belongs here, but which differs by a man- 

 dibulate mouth). 



3. Hemiptera (the same as Latreille). 



4. Lepidoptera (the same as Linnaeus). 



II. Insects with mandibulate mouths. 



5. Hymenoptera (like Linnaeus and Latreille). 

 t>. Neuroptera t ( do. do. ). 



7- Orthoptera (like Latreille, but with the addition of the 



order Dermaptera). 



8. Coleoptera (like Linnaeus and Latreille). 

 All other apterous insects Lamarck places among the Arachnides 

 and Crustacea. Then the Thysanura, (Lcpisma, Podura,) Myria- 

 poda, (Scolopendra,*) Julus and the parasites (Pediculus, Ricinus) 

 among the Arachnides, with the scorpions, spiders, and Acari ; the 

 Crustacea are the same in Cuvier and Latreille. 



347. 



Another French naturalist, Dumeril, to whom we are indebted for a, 

 in some degree, peculiar division of insects, in so far differs from the 

 opinion of his compatriots, that he places insects in the series of 

 animals above the Mollusca his arrangement, with this exception, 

 is but a slight modification of the Linnaean. He forms two classes of 

 Linnaeus' insects, namely, Crustacea and lusecta, the former of which 

 comprises all the crabs, and the latter, on the contrary, all the six- 

 legged insects, spiders, scorpions, wood-lice, and Myriapoda. They 

 are thus brought into eight orders 

 I. Insects with wings. 

 A. Four wings. 



a. Mouth with mandibles. 



a. a. Wings unequal, the anterior horny. 



* The posterior transversely folded. 1. Order. Coleoptera. 

 ** The posterior longitudinally 



folded. 2. Orthoptera. 



b. b. Wings equal. 



* With reticulated nervures. 3. Neuroptera. 

 ** With ramose nervures. 4, Hymenoptera, 



