54 WILLIAM T. M. FORBES 



34. Abdomen with setae iv and v in a diagonal or vertical line; hooks usually 



multiordinal (fig. 27) Tortricidae (p. 376) 



35. Coxae of metathoracic legs twice as far apart as wide; prolegs small; small 



species (fig. 194) Lavernidae (p. 318) 



35. Coxae of metathoracic legs closer together 36 



36. Setae i and ii adjacent on abdominal segments. 



Heliodinidae (Schreckensteinia) (p. 356 1 ) 



36. Setae i and ii widely separated 37 



37. Front reaching less than half way to vertex (about half way in some very 



large species with horizontal head and triordinal hooks) 38 



37. Front reaching two-thirds way to vertex or a little shorter, and ending in an 



attenuate point; small species with uniordinal or biordinal hooks 39 



38. Borers; abdomen with setae iv and v on separate tubercles on the ninth seg- 



ment (fig. 296) Cossidae (p. 516) 



38. Leaf feeders; abdomen with seta; iv and v on the same tubercle on the ninth 



segment Xylorictidae ( Stenoma ) ( p. 250 ) 



39. Hooks of prolegs biordinal 40 



39. Hooks of prolegs uniordinal 41 



40. Second, third, and fourth ocelli grouped together, more widely separated from 



first and lower (fig. 149) CEcophoridae (p. 230) 



40. Ocelli evenly spaced" Gelechiidae (p. 255) 



41. Abdomen with iii farther back than spiracle on eighth segment". 



Blastobasidae (p. 308) 



41. Abdomen with seta iii not farther caudad than spiracle. 



Glyphipterygidae (p. 350) 



42. Prespiracular wart on prothorax with three setae (figs. 150, 151) 43 



42. Prespiracular wart on prothorax with two setae 44 



43. Setae iv and v of abdomen remote; or, if approximate, setae beta much closer 



together than setae alpha on prothorax (like fig. 210) and prolegs long and 

 slender Yponomeutidae (p. 337) 



43. Setae iv and v close together; beta about as far apart as alpha; prolegs 



usually short CEcophoridae (Ethmia) (p. 244) 



44. Tubercle vii on mesothorax and metathorax with two setae 45 



44. Tubercle vii on mesothorax and metathorax with a single seta 47 



45. Setae minute, tubercles reduced to obscure rings, head unusually wide; and 



prolegs reduced Thyatiridae (p. 686) 



45. Setae heavy, almost always spinulose, on conspicuous tubercles 46 



46. Tubicle iii of abdomen with two setae Lithosiidae (p. 42) 



46. Seta iii of abdomen single Arctiidae ( Utetheisa) ( p. 42 ) 



47. North American species with enlarged, contrasting tubercles; and a hump 



on eighth segment of abdomen; contrastingly striped transversely (or 

 spotted) with black Agaristidae (p. 42) 



47. Caterpillars of other types Noctuidae (p. 42) 



48. Larvae with less than the normal number of ventral prolegs; or with the 



first pair of ventrals much reduced 49 



48. Larvae with the normal four pairs of ventral prolegs; the anals sometimes 

 reduced 50 



48. Larvae with additional prolegs without hooks Megalopygidae (p. 101) 



49. Hair tufted; hooks of prolegs uniordinal; 14 legs Nolidae (p. 43) 



49. With a few subprimary hairs only (in some exotic species with fine secondary 



hair), sometimes with only a single subventral subprimary on sixth 

 segment of abdomen; usually 10 legs Geometridae (p. 41) 



50. Anal prolegs wholly lost Drepanidae (p. 688) 



50. Anal prolegs represented by a pair of large tubercles, or flagella at least, 



normally fully developed 51 



'These characters are said to be inconstant but none are better known to ms. 



