Hypotrix, Guenee, 1852

Lafontaine, Donald, Ferris, Clifford & Walsh, J., 2010, A revision of the genus Hypotrix Guenee in North America with descriptions of four new species and a new genus (Lepidoptera, Noctuidae, Noctuinae, Eriopygini), ZooKeys 39 (39), pp. 225-253 : 229-230

Key to North American species of Hypotrix

1. Forewing longitudinally streaked; antemedial, medial, and postmedial lines absent ........................................................................................................ 2

– Forewing pattern mottled or well defined but not longitudinal streaking; some transverse lines evident...................................................................... 3

2. Forewing with yellow or orange on veins and black streaks between veins.... .................................................................................................. H. ferricola

– Forewing cream colored with fine dark streaks and speckling and dark shading toward posterior margin of wing .................................. H. diplogramma

3. Reniform spot large, black and crescentic, usually fused to rounded black orbicular spot................................................................................ H. lunata

– Reniform spot, if dark, then kidney shaped or oval .................................... 4

4. Middle and hind tibiae with spiniform setae posteriorly near tibial spurs ... 5

– Middle and hind tibiae without spiniform setae......................................... 8

5. Forewing with subterminal line straight with dark line proximally ............. 6

– Forewing with subterminal line absent or irregular..................................... 7

6. Reniform and orbicular spots with pale contrasting outline; foretibia with spiniform setae............................................................................ H. spinosa

– Reniform spot mainly obscure, except for dark area in lower part of reniform spot; orbicular spot a dark dot; foretibia without spiniform setae ................. ................................................................................................. H. parallela

7. Forewing without basal dash; antemedial line separated from orbicular spot by distance equal to width of line................................................ H. ocularis

– Forewing with black basal dash; antemedial line touching orbicular spot ..... ................................................................................................ H. basistriga

8. Forewing silvery gray with contrasting orange and orange-brown shading in terminal area .................................................................................. H. naglei

– Forewing reddish brown, orange brown, or yellow brown; terminal area similar in color to remainder of forewing.......................................................... 9

9. Forewing with three mainly parallel dark and/or light transverse lines.......... .................................................................................................. H. trifascia

– Forewing with transverse lines more irregular........................................... 10

10. Forewing with reniform and orbicular spots gray with contrasting yellow triangular spot between them and below costa................................. H. optima

– Forewing without yellow between reniform and orbicular spots............... 11

11. Forewing with medial area much paler than basal and subterminal areas, so reniform and orbicular spots contrastingly darker .......................... H. hueco

– Forewing with medial area similar in color to basal and subterminal areas and with reniform and orbicular spots not especially contrasting .................... 12

12. Forewing with subterminal line irregular; reniform and orbicular spots with pale-yellow outline; reniform and orbicular spots not especially contrasting. .................................................................................................. H. alamosa

– Forewing with subterminal line straight, except toward apex; reniform spot mainly obscure, except for dark area in lower part of spot; orbicular spot absent ................................................................................................ H. rubra