Lepidoptera of New Yoek and Neighboring States 45 



ARTIFICIAL KEY TO THE FAMILIES OF LEPIDOPTERA6 



Imago 



Fig. 30. pobtion 

 of wing membrane 

 showing sockets 

 op scales and 

 wing spinules 



( acule^ ) . highly 



magnified 



1. Winged 2 



1. Wingless or with rudimentary wings 55 



2. Hind wings with four or five radials, with at least ten veins besides anals 



(figs. 31, 40) , wing-membrane spinulated (fig. 30) 3 



2. Hind wings with only one free radial (two in the otherwise much reduced 



Douglasia group, page 224) ; with at most six (or, with Sc, seven) veins 

 from cell 5 



3. Wings hardly wider than their fringe, expanse about one-half inch 4 



3. Wings ample, fringe narrow, expanse over one inch. Hepialidae (p. 66) 



4. Middle tibia? with a spur; mouth parts formed for sucking; Sc of fore wing 



forking near apex Eriocraniidse (p. 64) 



4. Middle tibiae unarmed, mouth parts formed for biting; Sc forking near mid- 



dle Micropterygidas (p. 62) 



5. Each wing deeply cleft into six narrow strips Orneodidae (p. 652) 



5. Fore wing moderately cleft into two, and hind wing deeply, into three, feathers 



(figs. 400-403) Pterophoridaj (p. 639) 



5. Wings entire, or one pair only, moderately cleft 6 



6. Inner margin of fore wing and costal margin of hind wing with series of 



recurved spines and interlocking; fore wing at least four times as long as wide, 

 and base, at least, of hind wing transparent (figs. 224-229) iEgeriidas (p. 360) 



6. Wings not interlocking at middle of margin, very rarely transparent, and, if 



so, with broader fore wings 7 



7. Hind wing lanceolate, without marked anal angle, or notched below apex and 



trapezoidal, or cleft; the fringe almost as wide as wing, or wider. (Micros 

 in part) 59 



7. Hind wings much broader than their fringe, never lanceolate, and rarely 



trapezoidal with produced apex 8 



8. A double series of enlarged and divergent scales along Cu of hind wing below; 



wings, body, and legs, very long Pterophoridae (Agdistinaa) 



8. No such specialized scales 9 



9. Fore wing with two anal veins well developed at middle of wing or at outer 



margin, the first a tubular vein at middle of wing in broad-winged forms, 

 sometimes tubular only at the margin in narrow ones 10 



•In the case of extra-limital families, no page is indicated; in those not inoluded in this memoir, 

 page references are made to the Drief family definitions in the synopsis, pages 41 to 44. 



