LEPIDOPTERA OP NEW YORK AND NEIGHBORING STATES 55 



51. Hooks of prolegs uniordinal (fig. 25) 52 



51. Hooks of prolegs biordinal or triordinal (figs. 26, 27) 66 



52. Warts rudimentary or absent, or obscured by secondary hair 53 



52. At least wart vi (subventral) many-haired and distinct, secondary hairs 



sparse or absent above prolegs : 60 



53. Anal plate bifurcated, head roughly papillose; third ocellus very large. 



Nymphalidse (Satyrinae) (p. 44) 



53. Anal plate simple; head smoother; third ocellus rarely much enlarged. .. .54 



54. Larva parasitic, with hemispherical body and a complete circle of uniordinal 



hooks Epipyropidse 



54. Larva more normal in shape, not parasitic 55 



55. Spiracles small, circular; ventral prolegs slender, more or less stem-like, with 



expanded planta Pterophoridae (p. 639 ) 



55. Spiracles elliptical, larger; ventral prolegs short 56 



56. Secondary setae dense 57 



56. Secondary setae very sparse or absent above prolegs ; with simple setae or a 



few subprimaries 58 



57. Notch of labrum deep, with parallel sides; anal prolegs full as strong as the 



others; with warts more or less overshadowed by the secondary hair. 



A few Noctuidae (p. 42) 



57. Notch acute, with convergent sides; anal prolegs much reduced and not used; 



warts rudimentary and dominated by a single hair (Melalopha) or absent 

 (Datana) Notodontidae (p. 42) 



58. Tubercle iv at about the same level on abdominal segments 6, 7, and 8. 



Liparidae (Doa) 



58. Tubercle iv much lower on seventh than on other segments; anal prolegs more 



or less reduced or modified 59 



59. Skin shagreened Di optidse 



59. Skin not shagreened Most Notodontidae (p. 42) 



60. Eversible mid-dorsal glands on two segments of abdomen Liparidae (p. 42) 



60. No eversible dorsal glands 61 



61. Spiracles circular, small 62 



61. Spiracles elliptical, normal in size 63 



62. Ventral prolegs short, with a straight band of heavy hooks. 



Pyromorphidae (p. 113) 



62. Ventral prolegs slender, with an expanded planta sometimes bearing a circle 



of hooks Pterophoridae (p. 639) 



63. Mesothorax with only a single large wart above level of spiracles. 



Euchromiidae (p. 43) 



63. Mesothorax with two or three warts above level of spiracles 64 



64. Wart (or seta) iv at about the same level on seventh abdominal segment 



as on the sixth and eighth Arctiidae (p. 42) 



64. Wart (or seta) iv much lower on seventh segment or absent (perhaps fused 



with v) 65 



65. Hooks of prolegs even in length, or gradually becoming smaller at ends of 



row A few Noctuidae (p. 42) 



65. Hooks of prolegs abruptly decreasing in size near each end Pericopidse 



66. Body without general secondary hair, often with a few subprimaries; with 



not more than eight hairs on prolegs 67 



66. Body with numerous secondary setae, at least on the prolegs; anal prolegs 



always well developed 72 



67. Hooks in a complete circle (fig. 412) 68 



67. Prolegs with a band of hooks on inner side, sometimes supplemented with a 



much weaker band on outer side 70 



68. Subdorsal setae of abdomen represented by warts. 



Yponomeutidae (Scytkris) (p. 349) 



