30 MEMOIR OF LATREILLE. 
I. Insects without wings, uipiera. 
A. With segments bearing seven or more pair of legs. 
a. Head separated from the thorax. 
a. a. Four antennse. Last seg- 
ments of the body with- 
out legs . . Legion 1. Tetracera. 
h. h. Two antennfc. All the seg- 
ments except the last 
with legs 2. Myriapoda. 
h. Head connected with the thorax. 
No antennae 3. Accra. 
B. With three segments bearing legs . 4. Apterodicera. 
II. Insects with wings 5. Pterodicent. 
A. WMth elytra and wings. Eh/troptera. 
a. With mandibles. Odontata. 
a. a. Wings folded transverse- 
ly Order 1. Cohoptera. 
b. h. 'Wings folded longitudinal- 
ly 2. Orthopiira. 
b. With haustellate mouth. Sipho- 
nostoma 3. Hemiptera. 
B. Without elytra, but having wings. 
GyrmiojiteTa. 
a. With mandibles. Odontata. 
a. a. Nervures reticulated . . 4. Neurtpttra. 
b. b. Nervures ramose ... 5. Hyimnoptcra 
b. W^ith haustellate mouth. Sipho- 
nostoma. 
a. a. Four wings covered with 
scales 6. Lepidoptera. 
b. b. Two wings and two hal- 
teres 7. Dipt era. 
c. c. No wings or halteres . . 8. Sudor. 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 autlior 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 
* Shuckard's Trans, of his Manual •f Ent., p. 610. 
