153 



and the Ceratocampiadoe, and in the following order you will 

 observe how one group represents another opposite to it. 



BOMBYCES. PSEUDO-BOMBYCES. 



5 Attacidae c. g., Attacus, etc. = Ceratocampa, etc. 6 Ceratocampiadaa. 

 4 Bombyciadaj e. g., Mogasoma = Zeuzera, etc. 7 Zeuzeriadas. 

 3 Liparidae e. g., Orgyia = Psyche, etc. 8 Psyehiadae. 

 2 Ai-ctiadfe e. g.. Spilosoma = Clostera, etc. 9 oSTotodontiadse. 

 1 Lithosiada? = 



Iii the following order you will see how these lead from the 

 Sphinges. 



,. f 6 Ceratocampiadse. 5 Attacidaa, [Acronvc- 



bphmges verse J L . 



[ 7 Zeuzeriadae .... 8 rsychiadae, ' 9 jSotodon-J ta, etc. 



.. f 2 Arctiadoe . . . 3 Liparidas, tiadse Plusia, 



Sphinges adscitasJ 



1 1 Lithosiada? 4 Hombyciadae j [ etc. 



Or thus : 



7 8 



6 5 



1 ..... 4 



2 . .3 



7 8 

 6 9 



9 Or thus: 5 



1 4 



2 3 



Here the Ceratocampians represent the Sphiiigians, and the 

 Zeuzeriaus the ^Egerians ; while the Arctians and Lithosians 

 seem naturally to follow the Agaristians and Callimorphians. 

 Between the Zeuzerians and Arctians there is 110 affinity ; but 

 there are analogous forms in each, as might be expected from 

 their situation ; e. g., Zeuzera ceseidi and Arctia scribonia. So, 

 too, there is no affinity between the Psycliiadce and the Lipa- 

 ridce ; but their forms are analogous, e. g., wingless and slug- 

 gish females in each, etc. Moreover, the antennae of Psyclie 

 graminella and the venation of the wings are wonderfully like 

 those of Orgyia. 



It would be impossible for me, within the compass of a single 

 letter, to repeat the various considerations which have confirmed 

 me in this arrangement. Taking the families in a linear series, 

 I have begun in my report with the Lithosians, as intimately 



