'M') ]\Iv. Butler's Ilrvifiion. of Gnirrn of 



GENUS 21. DERPAS. E. Doiihhday. 



Gen. Diurn. Lepid., \x 70 (1847). 



Rh odorrra , A'^ollenhov ei i . 



Tneludes D. VerliuAlii, Gohrirts, and Wdlliehii. 



GENUS 2-2. KKTCOGONIA. Bcal-hi. 



ProcEut. 8oc. Phil. 2, p. ;;.:),"■) (1863). 

 riicliides A'^ LjiHide and allies. 



GENUS 23. ^MEGONOSTOMA. J!mJ:irf. 



Proc. Ent. Soc. Phil. 2, p. 356 (1863). 

 A good genns including tlie Ckewivid group of the old 

 genus Colias. 



GENUS 24. CALLIDRYAS. lioisdural. 



Lep. Am. Sept., p. 73 (1820). 



Ty]je C. Euhidc. Liinianis. 



Murtia, Caiojjsilia, and PImhis, Hiibn. 



Hilbner previously characterized this genus under three 

 different names, but the name Callidri/as having l)een so 

 long in use for so large and widely distributed a group I 

 do not think it at all desirable to change it : of the names 

 nsed by Hiibner, 3[urtia is too close to a genus of Ormfacea, 

 Cafopsilia is not unlike Cafops and Phoibis is too near to 

 PJirvhe subsequently used in Colcoptcra ; in the latter case 

 of course the Coleopterous name would have to be altered, 

 but considering all things I think it Itest for us to i-etain 

 (Jcdllil nfris. 



GENUS 25. PTYCHOPTERYX. Wallenrjrcn. 



Kongl. Svensk. Vetensk.— Akad. Handl, p. 17 (1857). 



Ofvers, Kongl. Vetenslc— Akad. Filrhandl, p. 77 (1858) 

 as TIuspui. 



Di'. Felder considers this genus identical with Teracoliis 

 Swains., but, if I have rightly nnderstood Dr. Wallengren's 

 descri])ti()u, it is distinct. 



GENUS 26. TERACOLUS. Siminson. 



Zool. 111., 1st S.,])l. 115 (1833). 



Aphrodite, Hlibn. : Callosunr, Doubl. ; Idniaix, P)oisd. ; 

 A iiflu)])t<iir}u', Wllgr. 



This gemis will include tlui wlidle of tlie species hitherto 

 rei'erred to Id/ntti.^ and Callosifne; I can find no constant 



