Lepidoptera. 55 



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. (Cicumus, LacosSma.) 



LACOSOMATrD.^ 



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. 



URANilD^ 



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



with the third LONOMIID.S 



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



EUPTEROTlN/E of the EUPTEROTID^ 



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



{Bdmhijx mbri, the silkworm.) BOMBYCID.S 



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. (MalacosSma {=Clisiocampa) [M. 

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



Tolype.) LASIOCAMPID^ 



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 forai, the tip of the fore wing usually 

 curving back. (Drepana, Oreta) (Including PLATYPTERYGID^, 



AUZATIDm DREPANID^ 



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, Dysodia.) THYRIDIDjE 



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, Ctenucha) {ZYGxENIDM of some 



authors) SYNTOMIDiE 



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. ocfomaculata. Forester moth] Androloma) (PI. 10, fig. 227). 



AGARISTID.S 

 Antennae regularly tapering to apex 45 



