58 William T. M. Forbes 



12. Antennae extending at least three -fourths the length of the wings; labrum 



normal 13 



13. Fourth segment of abdomen free from third; antennae and hind legs not sub- 



equal in length, and seldom extending beyond tip of wings 14 



13. Fourth segment soldered to third; antennas and hind legs subequal and extend- 



ing beyond tip of wings 15 



14. Labial palpi visible; last segment with two dorsal spines; setae i closely approxi- 



mate on mid-dorsal line on middle abdominal segments. . . Tischeriidae (p. 145) 



14. Labial palpi invisible; last segment with two lateral spines; setae i normal, 



well separated Lyonetiidae (Bucculatrix) (p. 148) 



15. Abdominal segments 3 to 7 each with two deep punctures at the anterior 



margin near the mid-dorsal line; segments 8 to 10 together shorter than 

 segment 7, not separated by distinct incisures. 



Lyonetiidae {Phyllocnistis) (p. 148) 



15. No such pits on dorsum; abdominal segments 8 to 10 relatively longer. 



Gracilariidae (p. 161) 



16. Cremaster developed with a distinct stem, longer than thick. 



Tortricidse (Peroneu) (p. 376) 



16. Cremaster not developed, its hooks attached directly to body 17 



17. Body iieavily chitinized; dorsal spines or setas on abdomen in transverse rows; 



first abdominal spiracles invisible 20 



17. Body lightly chitinized; dorsal spines irregular; spiracles visible on first 



abdominal segment 18 



18. Abdominal segments with spines on anterior part and setae on posterior part; 



large conical tubercles behind several abdominal spiracles. 



Megalopygidae (p. 101) 



18. Abdominal segments without areas of fine setae; no tubercles behind the 



spiracles 19 



19. Labial palpi exposed between maxillae, which are less than half length of 



wings Eucleidae (p. 102 ) 



19. Labial palpi concealed -by maxillae, which are more than half length of wings. 



Pyromorphidae (p. 113. 



20. Mesothorax less than twice as long as metathorax; maxillae quadrangular. 



widely separated, divergent Hepialidee (p. 66 ) 



20. Mesothorax more than twice as long as metathorax; maxillae longitudinal, their 



tips often meeting in midventral bine; or all appendages obsolete 21 



21. Third abdominal segment movable on second; segments with an anterior row of 



spines and a posterior row of setae Psychidae (p. 140) 



21. Third abdominal segment fixed; segments with anterior and posterior rows 



of spines Cossidae (p. 516 ) 



22. Pilifers distinct, the labrum with three lobes, usually separated by a T-shaped 



suture (fig. 29) : 23 



22. Pilifers absent, labrum simple or obscurely bilobed 31 



23. Maxillary palpi present; antennae never fusiform and wider toward apex; fore 



femora usually visible 24 



23. Maxillary palpi absent 25 



24. Epicranial suture absent, f r onto -cly peal about half visible; eighth segment of 



abdomen free from the seventh in male ; no deep dorsal furrow between nintli 

 and tenth segments of abdomen Yponomeutidae (Atteva) (p. 337 ) 



24. Epicranial suture distinct at sides; sometimes running into suture between 



head and thorax at middle (except in the Phycitinae which have a deep groove 

 between ninth and tenth segments of abdomen) ; fronto-clypeal suture 

 absent; eighth segment fixed Pyralididae (p. 523) 



25. A deep groove between ninth and tenth abdominal segments dorsally; fore 



femora exposed Pyralididae (Epipaschiinee) (p. 604) 



25. No deep groove between ninth and tenth segments 26 



