153 



and the Ceratocampiadce, and in the followmg order you will 

 observe how one group represents another opposite to it. 



BOMBYCES. PSEUDO-BOMBYCES. 



5 Attacidse e. g., Attacus, etc. = Ceratocampa, etc. 6 Ceratocanijjiadae. 

 4 Bonibyciadas e. g., Mogasoma = Zeuzera, etc. 7 Zeuzeriadte. 

 3 Liparidas e. g., Orgyia = Psyche, etc. 8 Psychiadjc. 

 2 Arctiadfe e. g., Spilosoma = Clostera, etc. 9 NotodontiadEe. 

 1 Lithosiadas = 



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

 /Sphinges. 



Sphinges veraj 



( 6 Ceratocampiada3. 5 Attacidae, 



\ 1 Zeuzeriada^ .... 8 Psychiadte, 



o 1 . J V f 2 Arctiadaj 3 Liparidaj, 



ophinges adscit£ErJ . -r. i • 



11 Litnosiadae. . . .,. 4Bombyciada3 



9 Notodon- 

 tiadse 



Or thus: 





8 

 5 

 4 

 3 



Acronyc- 



ta, etc. 



Plusia, 



etc. 



7 8 



6 9 



Or thus: ^ 



1 4 



2 3 



Here the Ceratocampians represent the Sphingians, and the 

 Zeuzerians the ^gerians ; Avhile the Arctians and Lithosians 

 seem naturally to follow the Agaristians and Callimorphians. 

 Between the Zeuzerians and Arctians there is no affinity ; but 

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

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

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

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

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

 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 arrano-ement. Takino- the families in a linear series, 

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



