IHiVi.] 177 



If Without an intercostal cell. 

 I With a loiuj internal vein, extended to ami/ angle. 

 Costal long, free, simple. Subcostal 3-branched. 

 Disk usually open; if closed without disco-central. 

 F. w. with the subcosto-inferior nervule furcate. Saturnidae. 



F. w. with the subcosto-inferior nervule simple. Ceratocampidae. 



Jl With a short internal vein, near inner margin. 

 Costal and subcostal veins parallel towards the base. 

 Subcostal divides interior to the discal vein. 

 Discal angulated, simple, arising from subcosto-post apical. 

 Antennae pectinated or filiform. Palpi very short. Tongue almost obsolete. 

 Wings often falcate. * Drepanulidae. 



XXX ^Vithout an internal vein. Subcostal hifid. 

 Median trifid. Discal nervule arises from subcostal. 

 F. w. costal vein bifid. H. w. tailed. Imagos papilionaceous. Uranidae- 



HIND WINGS WITH A BRISTLE AT THE BASE. 



\A/INQS WI-THOUT- l_ONQ CILIA, NOT POINTED. 



HIND WINGS WITHOUT A COSTAL VEIN. 

 Submedian and internal veins distinct, long. 

 * Median vein 4-branched, 



Hind wings, costa dilated at the base. 

 Subcostal curved, 3-branched, with an imperfect basal cell. 

 F. w. subcostal exterior to the disk 4-branched ; fold thickened ; submedian doubly 

 furcate. Bombycidae (Gen. Fimela). 



Hind wings, costa not dilated at base. 

 Subcostal bifid. Lower branch not decidedly angulated. 

 Without disco-central. Antennae incrassated at the tip, shortly pectinate. 



Zygaenidae. 

 Antennae setaceous, pectinate; body often metallic. 

 Subcostal bifid. Lower branch decidedly angulated. 

 With disco-central, antennse pectinate; wings slightly diaphanous. Ctenuchidae. 

 ** Median vein 3-branched. 

 f Subcostal trifid. With a disco-central nervule. 

 Antennae setiform ; wings semidiaphanous. (Nudarial C.) Lithosidae. 



X Without disco-central nervule. 

 Wings with marginal gemmated spots. (A remarkable exception.) Pyralidae. 

 F. w. with a broad stripe; f. w. neuration sphingiform (Ormetica, C.) 



Glaucopididae. 

 f "f Subcostal bifid. Without disco-central. 

 Antennae miniitely pectinated ; f. w. subcostal branches separated. 



Lycomorphidae. 



* Characters drawn from Platypteryx (Drepana) lacertinaria of Europe. 



