based on the principle of Cephalization.—Insects. 16 
2. AMPLIPENS (from amplus large and penna). 
a. Lepidopters.—Perterrestrial. Permaturative. 
b. Homopters.—Perterrestrial. Prematurative, 
¢. Trichopters—*Semiaquatic. Permaturative. 
3. ATTENUATES, or NEUROPTERS. 
a. Apipenniforms.—Perterrestrial. Permaturative, or prematurative. 
b, Ampli if Perterrestrial, iaquatic. Permaturative, 
* 
4 Lf 7 
or prematurative. 
c. Perattenuates, or Typical Neuropters.—Semiaquatic. Prematu- 
rative. 
II. Ptero-metasthenics, or Elytropters. 
a. Coleopters.—Mostly terrestrial. Permaturative. 
b. Hemipters,—Mostly terrestrial. Prematurative. 
¢. Orthopters.—Terrestrial. Prematurative. © 
a, Curs 
: ors. 
6. Ambulators. 
7. Saltators, or Typical Orthopters. 
III. Thysanures, or Apters. 
Lepismians and Podurians. 
I, PTERO-PROSTHENICS, or CTENOPTERS. 
neatly adjusted and all well-proportioned. Among them, there 
* This point is well presented in a recent paper on “ Synthetic Types in Insects,” 
by A.S, Packard, Jr., (Jour. Boston, Soe. Nat. Hist., 1863, pp. 590-608). The au- 
thor observes, on page 591, “the clear-winged Sesia [Lepidopter] imitates the 
humble-bee in its form and flight; the different species of Algerians [Lepidopters} 
simulate members of nearly every hymenopterous family, as we ean see when re- 
calling such names as apiformis, vespiformis, philanthiformis, tiphiaformis, scolice- 
Sormis, spheciformis, chrysidiformis, cynipidiformis, formiciformis, ichneumoni for- 
mis, uroceriformis, and tenthrediformis. So also other Agerians resemble different 
f Diptera, as seen in the 
