Lepidoptera. 53 



37. Fourth and fifth branches of the radius stalked, widely separate from the third 



branch; moderate sized, rather stout-bodied, hairy moths, with the wings 

 often notched or concave behind. (Cicinnus, Lacosdma.) 



LACOSOMATIDJE 



Fourth and fifth branches of the radius arising from the discal cell closely 

 associated with the third branch .................................... 38 



38. Fifth branch of the radius stalked with the first branch of the media, or closely 



approximate at base and separate from the fourth branch of the radius. 



Fourth and fifth branches of the radius separate, the fourth sometimes stalked 

 with the third ......................................... LONOMHDJE 



39. Frenulum about one-sixteenth the length of the hind wing. 



EUPTEROTlN^ of the EUPTEROTDXE 



Frenulum absent, or at most not exceeding the front basal angle of the wing. 

 (Bdmbyx mbri, the silkworm.) .......................... BOMBY^CID^E 



40. Second cubital vein in the fore wing arising from the cell about a third-way 



out from the base, or even nearer the base; last radial vein stalked with 

 the first medial; frenulum absent, the basal front angle of the hind wing 

 expanded and furnished with a couple of short extra veins; stout-bodied 

 moths of medium or rather large size. 'Malacosoma (= Clisiocampa) [M. 

 americanum, Apple tent-caterpillar; M. disstria, Forest tent-caterpillar], 

 T61ype.) .......................................... LASIOCAMPIDJE 



Second cubital vein of fore wing arising well beyond the middle of the cell; 

 frenulum usually present .......................................... 41 



41. Subcosta and radius in hind wing strong and parallel to beyond the end of the 



cell, then approaching very close or fusing for a short distance; small or 

 moderate-sized moths of slender form, the tip of the fore wing usually 

 curving back. (Drepana, Oreta) (Including PLATYPTERYGID1E, 

 AUZATIDM) ........................................ DREPANIIXE 



Subcosta and radius fusing before end of cell; or wholly independent ...... 42 



42. Fore wing with complete venation (twelve veins), all of the radials, medials 



and cubitals arising separately or with the second and third radials short- 

 stalked; small moths of slender build, usually with pale, translucent spots 

 on the wings. (Thyris, Dysddia.) ....................... THYREDIDjE 



Third and fourth radial veins, or the fourth and fifth long-stalked, or else 

 with some veins absent ............................................ 43 



43. Subcosta apparently absent, fused with the radius except at the extreme base; 



rather small or medium-sized moths, often brightly colored, the wings small, 

 especially the hind pair. (Scepsis, Ctenftcha) (ZYGsENIDJE of some 

 authors) ............. ................................ SYNTOMID^ 



Subcosta and radius separating before the end of the cell ................ 44 



44. Antennae swollen or enlarged toward tip; rather small or medium-sized moths 



of brilliant colors, often dark, ornamented with large pale spots. (Alypia 

 [A. octomaculata, Forester moth] Androldma) (PI. 10, fig. 227). 



AGARISTIDjE 

 Antennae regularly tapering to apex .................................... 45 



