based on the principle of Cephalization.—Insects. 31 
their subdivisions (pp. 22, 24). The line for the Homopters is 
made to run lowest on account of the Aphids and Coccids, 
Apipens. 
me oan 
Hym. 
; pe. 
Amplipens. bis 
Dip. ae : Attenuates. Col. e' 
Lep. eerie, #8. 
Ap. 
| Hom. Amp. Hem. 
Or. 
P. 
Aph. Tri. | | 
Thy. 
a |v 
/ ene bens sod 
I It 
which seem to be inferior even to the Pediculi of the Hemipters 
and Nirmids of the Orthopters. : 
Designations of the successive grades of groups. 
The parallelism between the grander subdivisions of the 
Pterometasthenics (Coleopters, Hemipters and Orthopters) and 
those of the Apipens, (Hymenopters, Dipters and Aphanipters,) 
and Amplipens, (Lepidopters, Homopters and Trichopters,) 
teaches that these subdivisions are codrdinates, or of one grade. 
This is further indicated by other points of parallelism, namely, 
that the first subdivision of the Pterometasthenics and Apipens, 
the Hymenopters and Coleopters, have eminently the features 
each of a high type; and the last, the Aphanipters and typical 
Orthopters, are alike metapodosthenic or saltatorial species. So 
icckaennipattestnniia 
3 
also under the Amplipens, the 2nd subdivision, or that of Ho- | 
mopters, is closely related to the second of Pterometasthenics, 
or that of Hemipters (page 27). : 
_ Hence, if the grander subdivisions of Apipens and of Ampli- 
to are called tribes, those of the Pterometasthenics should also 
So designated. 
Under the subkingdom of Articulates, there are the classes of 
Insecteans, Crustaceans and Worms; and under Insecteans, the 
orders Insects, Spiders and Myriapods. = 
then the term tribe be used for the familiar groups, Hymen- 
opters, Dipters, &c., as just suggested, the question comes up as 
to the designations of the two intermediate grades of groups be- 
tween orders and tribes : 
The distinctions on which they are based are so obviously or- 
inal that they may be well called orders of subordinate grades; 
and I propose for the first of the two the PON ee stages 
nd for the second ordinules, a diminutive of orders. 
will then be as follows. 
é 
oo 
