30 MEMOIR OF LATREILLE. 



I. Insects without wings. Aptera. 



A. With segments bearing seven or more pah of logs. 



a. Head separated from the thorax. 



a. a. Four antenna?. Last seg- 



ments of the body with- 

 out legs . . Legion 1. Tetrucera. 



b. b. Two antenna?. All the seg- 



ments except the last 



with legs 2. Myriapoda. 



b. Head connected with the thorax. 



No antennae 3. Accra. 



B. With three segments bearing legs . 4. Apterodicera, 



I!. Insects with wings 5. Pterodicera. 



A. With elytra and wings. Elytroptcra. 



a. With mandibles. Odontata. 



a. a. Wings folded transverse- 



ly Order 1. CoJeoptera. 



b. b. Wings folded longitudinal- 



ly 2. Orthopkra. 



b. With haustellatc mouth. Sipho- 



nostoma 3. Hcmijttra. 



B. Without elytra, but having wings. 



Gymnoptera. 



a. With mandibles. Odontata. 



a a. Nervures reticulated . . 4. Nevraptera. 

 b. b. Nervures ramose ... 5. Hymenoptcra 



b. With haustellate mouth. Sipho- 



nostoma. 



a. a. Four wings covered with 



scales 6". Lepid 'opt.ru. 



b. b. Two wings and two hal- 



tercs 7. Diptera. 



c. c. No wings or halteres . . 8. Suctur a. 



Many parts of this arrangement must be allowed 

 to possess the highest merit, but there are others 

 to which this praise cannot be awarded, and of 

 this the author himself seems to have been con- 

 scious, as he afterwards introduced material changes- 

 " We may oppose to this arrangement," says Bur- 

 meister, * " which, as it does not regard the entire 

 * Shuekard's Trans, of his Manual of Ent., p. 610. 



