cciv Proposed Division of Neuroptera into two Classes. 



Larva residing in a movable case, which is 

 carried on its body as a snail carries 

 its shell : — 

 Case opening in a circle : — 

 Thoracic segments rounded : — 

 Supposed organs of respiration 



single, filamentous Phryganeid^e, Newm. 



Supposed organs of respiration in 

 bundles : — 



Hind legs long Mystacidid^e, Newm. 



Hind legs short Sericostomid^e, Steph. 



Thoracic segments with the front an- 

 gles pointed TrichostomiDvE, Newm. 



Case opening with a slit Hydroptilid^e, Steph. 



Larva residing in a fixed case : — 



Pupa in a double envelope Rhyacophilidje, Steph. 



Pupa inclosed in a single envelope .... HYDROPSYCHiD^&fejoA. 



From this analytical view of the contents of the two proposed class- 

 es, it results : — 



1. That there is no difficulty in defining the limits of each, and no 

 genera occupy debateable ground between them. 



2. That there is no discrepancy in the numerical contents ; that is, 

 that their divisions and subdivisions, as families, genera, and species, 

 nearly correspond. 



3. That in the distinctive characters laid down, that of metamor- 

 phosis is employed as imperative in all other instances in the science 

 of Entomology, and therefore, that its employment as imperative in 

 the present instance, is no innovation, nor any deviation from an ac- 

 cepted law of the science. 



4. That the divisions flow naturally into each other as now arran- 

 ged, whereas in all arrangements where the fourteen minor groups are 

 treated as parts of a single major group, and arranged in accordance 

 with structure only, there are perpetual violations of Nature : groups 

 are approximated that have only a single character in common, and 

 others dissevered that are all bat identical. 



Under such circumstances, I cannot entertain a doubt that the 

 classes Neuroptera and Stegoptera will hereafter be received as es- 

 sential component parts of all systems of Entomology. 



Edward Newman. 



September, 1852. 



