OARADKININA 



together in such a way that subdivision into definite groups 

 is not praofcioable. The phylogeny is diffioult, but Colli- 

 morpha is clearly the most ancestral form (in this and other 

 exotic genera which approach nearest to the two next families, 

 the strong bar-like retinaculum offers an additional point of 

 distinction), and the group of Tyriaand Arctia is closely derived 

 from this ; the Lithosia group may probably be a development 

 of the Arctia group; whilst the Nolo, group and that of Sarro- 

 thripus and Halias appear to be two ancient and now frag- 

 mentary sections, to some extent intermediate in character 

 between the two mentioned above, but sufficiently isolated to 

 make their origin at present undecipherable. 



Ovum in groups of Arctia and Lithosia usually spherical, 

 smooth or minutely pitted; in Nola group strongly ribbed. 

 Larva usually hairy, except in Halias group ; in Nola group 

 without prolegs on 7. Pupa usually in a cocoon above ground. 



Tabulation of Gknejia. 



1. Forewings with 7 separate . . .2. 



>, ,, 7 out of 9, or absent . . 4. 



2. Hindwings with 5 absent . 11. Sakuotiihicus. 



ij ,, 5 present . . .3. 



3. Head rough-haired . . .14. Halias. 



„ smooth-scaled . 13. Hylophila. 



4. Hindwings with 4 or 5 absent . . .5. 



,, „ 3, 4, 5 all present . . 10. 



5. Forewings with 5 absent . .2. Lithosia. 



,, „ 5 present . . .6. 



6. Forewings with 7 or 8 absent . . .8. 



,, ,, veins all present . . .7. 



7. Forewings with 10 connected with 9 . 1. OflONISTIS. 



., „ 10 separate . . 12. Earias. 



8. Forewings with 10 absent . . 8. Roeseua. 



„ „ 10 present . . .9. 



9. Hindwings with 4 absent, 3 and 5 parallel 9. Nola. 



» ,, 5 absent, 3 and 4 connate 17. Cosoinia. 



10. Forewings with 7 absent . . .7. Nuiuiiia. 



„ ,, all veins present . . .11. 



11. Antennae in <j bipeotinated . . .12. 



„ „ ciliated . . .14. 



12. Forewings with 10 out of 9 l.'ii 



" ,.10 rising separate . 20. Ahctia. 



