1864.] 237 



PTEROPROSTHENICS.— Front wings not elytriform. 



I. APIPENS.— Wings like those of a bee. 



1. Hymenopters. Perterrestrial. Permaturative.* 



2. Dipters. Mostly perterrestrial. Permaturative. 



3. Aphanipters. (Fleas.) Perterrestrial. Permaturative. 



II. AMPLIPENS.— Wings large. 



1. Lepidopters. Perterrestrial. Permaturative. 



•3. Homopters. Perterrestrial. Prematurative. 



3. Trichopters. (Phryganeids.) Semiaquatic. Permaturative. 



III. ATTENUATES. (Neuropters.)— Body, legs and wings slender. 



1. Apipenniforms. Perterrestrial. Permaturative or prematurative. 



a. Termitideans. Hymenopteroid. 



b. Panorpideans. Dipteroid. 



c. Group unknoion. Aphanipteroid. 



2. Amplipenniforms. Perterrestrial or semiaquatic. Permatura- 



tive or prematurative. 

 a. Planipcnnians. Lepidopteroid. (Myrmeleontids, Hemerobiids, 



Nymphids,f Mantispids and Semblids.) 

 \ h. Psocideans. Homopteroid. 



c. Perlideans. Trichopteroid. 



3. Perattenuates or Typical Neuropters. Semiaquatic. Prematu- 



rative. 



a. Lihellulideans. 



b. Ephemerideans. 



PTEROMETASTHENICS.— Front wings elytriform. 



1. Coleopters. Mostly terrestrial. Permaturative. 



2. Hemipters. (Heteropters and Pediculids.) Mostly terrestrial. 



Prematurative. 



3. Orthopters. Terrestrial. Prematurative. 



a. Cursors. Coleopteroid. (Forflculids and Blattids.) 



b. Ambulators. Hemipteroid. (Mantids, Phasmids and Nirmids.) 



c. Saltators or typical Orthoptera. 



THYSANURES or APTERS.-Wingless. 



1. Lepismians. 



2. Podiirians. 



2. Unknown degradational group. 



* By " perterrestrial" as opposed to semiaquatic," Prof. Dana means that the 

 larva is not aquatic with aquatic respiration, and by "permaturative" as op- 

 posed to "prematurative" that the imago is altogether unlike the larva, or as 

 it is commonly phrased, that the metamorphosis is complete. 



1 1 am unable to conjecture what Neuropterous group is here referred to by 

 the term "Nymphids." No such family or genus is mentioned either by La- 

 treille, Westwood, Hagen or any other writer known to me. It cannot be the 



