30 MEMOIR OF LATREILLE. 
I. Insects without wings. Aptera. 
A. With segments bearing seven or more pair of legs. 
o. Head separated from the thorax. 
a. a. Four antennae. Last seg- 
ments of the body with- 
out legs . . Legion 1. Tetracera. 
1. b . Two antennai. All the seg- 
ments except the last 
with legs 2. Myriapoda. 
b. Head connected with the thorax. 
No antennae 3. Acer a. 
B. With three segments bearing legs . 4. Apterodicera. 
II. Insects with wings 5. Pterodiceru. 
A. With elytra and wings. Elytroptera. 
a. With mandibles. Odontata. 
a. a. Wings folded transverse- 
ly Order 1. Coleoptera. 
b. b. Wings folded longitudinal- 
ly 2. Orthoptcra. 
b. With haustellate mouth. Sipho- 
nostoma . .3. Hemiptera. 
B. Without elytra, but having wings. 
Gynvioptera. 
a. With mandibles. Odoyitata. 
a a. Nervurcs reticulated . . 4. Neuriph ra. 
b. b. Nervurcs ramose ... 5. IJymenoplera 
b. With haustellate mouth. Sipho- 
nostoma. 
a. a. Four wings covered with 
scales 6. Lepidoptera. 
b. b. Two wings and two hal- 
teres 7. Diptera. 
c. c. No wings or halteres . . 8. Suctcr a. 
Many parts of this arrangement must be allowed 
to possess the highest merit, but there are others 
to which this praise cannot he 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 docs not regard the entire 
* Shuckard’s Trans, of Ills Manual of Ent., p. (i 1 0. 
