LEPIDOPTERA OF NEW YORK AND NEIGHBORING STATES 61 



54. Fronto-clypeal suture distinct at ends, resting on base of antennae; antennae 

 never a fifth as wide as long; spiracular furrows frequent 55 



54. Fronto-clypeal suture lost or rudimentary; antennae almost always a fifth as 



wide as long; spiracular furrows rare 59 



55. Antennae extending beyond apex of wings; last four segments of abdomen with 



hooked dorsal setae Dioptidae 



55. Antennae not extending beyond apex of wings ; abdomen rarely if ever with 



hooked dorsal setae 56 



56. Antennae usually considerably broader near the base, their greatest width 



usually greater than that of the prothoracic legs; antennae usually more 

 than three -fourths the length of the wings; if not, then the epicranial suture 

 is present, or the cremaster is wanting, or if present, bifurcate at the distal 

 end or bearing hooked setae; dorsum of the abdomen usually with a deep 

 furrow between the ninth and tenth segments; scar of a caudal horn never 

 present on the dorsum of the eighth abdominal segment; labial palpi some- 

 times visible as small triangular or polygonal areas caudad of the labrum. .57 



56. Antennae rarely very much broader near the proximal end, usually filiform, 



their greatest width seldom greater than that of the prothoracic legs; if 

 greater, then the cremaster is never wanting, nor bifurcate, nor with hooked 

 setae; antennae never more than three -fourths the length of the wings; 

 epicranial suture never present; dorsum of the abdomen never with a deep 

 furrow between the ninth and tenth segments; scar of a caudal horn usually 

 present on the dorsum of the eighth abdominal segment; labial palpi never 

 visible Sphingidaa (p. 42) 



57. Maxillae usually more than three -fifths the length of the wings; if not, then 



the caudal end of the body with hooked setae, or the spiracles of the third 

 abdominal segment concealed by the wings and those of the sixth segment 

 farther ventrad than those of the other segments; prothoracic femora often 

 exposed; a deep furrow usually present on the dorsum of the abdomen 

 between the ninth and tenth segments; posterior margin of mesothorax 

 never with a row of deep pits with smooth tubercle -like areas between. 



Geometridae (p. 41) 



57. Maxillae seldom exceeding three -fifths the length of the wings; if so, then the 



posterior margin of the mesothorax with a row of deep pits with smooth, 

 elevated, quadrangular tubercle -like areas between them; or with the entire 

 body surface coarsely punctate; abdominal spiracles of the third segment 

 never concealed by the wings, and those of the sixth never farther ventrad 

 than ,the remainder; prothoracic femora never exposed; a furrow never 

 present on the dorsum of the abdomen between segments 8 and 9 except in 

 Datana, where the cremaster is T-shaped with recurved hooks 58 



58. Maxillae rudimentary; abdomen with flanged plates, not telescoping, the ante- 



rior one on each segment divided by transverse constrictions into the appear- 

 ance of a row of beads Eupterotidae (p. 678) 



58. Maxillae developed; or abdominal segments not beaded, without flanged 



plates Notodontidae (p. 42) 



59. Body with primary setae only; iv and v distinct and approximated below 



spiracle Lacosomidae (p. 656) 



59. Body with rudimentary secondary setae; iv and v not recognizable 60 



60. Pupae with flanges on movable abdominal segments, not telescoping when 



dry 61 



60. Pupae without flanges on movable abdominal segments, the posterior seg- 



ments telescoping within the anterior ones when dry Saturniidae (p. 668) 



HI. Cremaster distinct, bifurcate; metathorax with prominent subdorsal callosities; 

 pupae in the ground Citheroniidae (p. 664) 



61. Cremaster rudimentary, represented by its hooks only; no callosities on meta- 



thorax; pupation at surface of ground, sometimes in a thin cocoon. 



Saturniidae (Hemileucinae) (p. 669) 



