LEPIDOPTERA OF NEW YORK AND NEIGHBORING STATES 53 



15. Hooks of prolegs in a single band, sometimes with a few rudimentary outer 



hooks besides 42 



16. Prespiracular wart of prothorax with two setae (fig. 319) 17 



16. Prespiracular wart of prothorax with three setae (fig. 174) 18 



17. Hooks uniordinal (fig. 25), body cylindrical, vii of mesothorax with a single 



seta Orneodidae (p. 652) 



17. Hooks biordinal or triordinal (figs. 26, 27), or uniordinal in larvae with stout 



fusiform body and bisetose tubercle vii of mesothorax Pyralididae (p. 523) 



18. Hooks of prolegs arranged in two transverse bands (fig. 107) 19 



18. Hooks in a circle or ellipse, sometimes broadly interrupted (figs. 42, 233). .24 



19. Prolegs with two simple series of hooks 20 



19. Prolegs with a single series of hooks, or with two bands formed of several 



series of alternate hooks (fig. 51) Incurvariidae (p. 72) 



20. Setae iv and v of abdomen remote Lyonetiidae (Bucculatrix) (p. 155) 



20. Setae iv and v of abdomen adjacent (tig. 319) 21 



21. Hooks of anal prolegs in two groups Gelechiidae (p. 255) 



21. Hooks of anal prolegs in a single series 22 



22. Front extending about one-third way to vertex Cossidae (Cossula,) (p. 516) 



22. Front extending at least two-thirds way to vertex 23 



23. Spiracles elliptical, normal in size, those of eighth segment of abdomen higher 



than the others .' .ffigeriidae (p. 360) 



23. Spiracles very small, circular, the last pair about in line. .Coleophoridae (p. 202 J 



24. Setae iv and v of abdomen remote, or, in a few minute species, v absent 25 



24. Setae iv and v adjacent, often on a common tubercle, no small hooks at base 



of principal series on prolegs 30 



25. Hooks arranged in a single complete ellipse .26 



25. Hooks arranged in a broken ellipse, or with additional rudimentary series 



at the base of the normal ones (fig. 28) 28 



26. Prothorax with setae of prespiracular group about as far from spiracle as 



from each other; seta i on abdomen higher than ii Lyonetiidae (p. 148) 



26. Prothorax with setae of prespiracular group about twice as far from spiracle 



as from- each other 27 



27. Seta i of abdomen, much lower than ii (fig. 92) Tineidae (p. 116) 



27. Seta i of abdomen not lower than ii Heliodinidae (p. 356) 



28. Mesothorax and metathorax with seta ia in front of ib and well separated, 



abdomen with iv above level of spiracle (fig. 42) Hepialidae (p. 66) 



28. Mesothorax and metathorax with setae ia and ib closely associated; abdomen 



with iv below level of spiracle 29 



29. Prothorax with seta beta, higher (nearer mid-dorsal line) than alpha (fig. 91). 



Tineidae (Acrolophinae) (p. 116) 



29. Prothorax with seta beta lower than alpha Yponomeutidae (p. 337) 



30. Last pair of spiracles dorsal, closer together on middle line than setae i of 



anterior abdominal segments (fig. 293) Carposinidae (p. 513) 



30. Last pair of spiracles nearly normal 31 



31. Mesothorax with two setse vii (above base of leg) 32 



31. Mesothorax with a single seta vii; ninth abdominal segment with seta ii 



higher than i 33 



32. Prothoracic spiracle with long axis vertical; ninth abdominal segment with 



seta i higher than ii Thyrididae (p. 521 ) 



32. Prothoracic spiracle with long axis horizontal Psychidse (p. 140) 



33. Setae ii of ninth abdominal segment closer together than on any other, fre- 



quently on the same plate (fig. 290) 34 



33. Setae ii of ninth abdominal segment as far apart as on the other segments, 



very rarely (Zeuzera) on the same plate 35 



34. Abdomen with setae iv and v practically horizontally placed; hooks of pro- 



legs uniordinal Phaloniidae (p. 499) 



