10 



13 



1 1 



12. Fore wings with prominent subtcrminal white band and 

 three large ocellate spots margined with black 



Nymphula Schrank, 1 802 



— Fore wings lacking subterminal white bajid and 3 

 ocellate spots Munroessa Lange, 1956 



13. Fore wings falcate apically . .Oxyelophila Forbes, 1922 



— Fore wings not falcate apically 14 



14. Cell in hind wings open . . . Eoparargyractis Lange, 1956 



— Cell in hind wings closed 15 



15. Cell in hind wings extending beyond center of hind 

 wing; tornus of fore wing in most species rounded; outer 

 margin of hind wings not emarginate uelow apex .... — 



Parargyractis Lange, 1956 



— Cell in hind wings extending to about center or just 

 beyond center of wing; outer margin of hind wings 

 emarginate below apex 16 11 



16. Veins SC and RS branching at about one-half distance 



to apex of hind wing 17 — 



— Veins Sc and Rs branching just before apex of hind 

 wing 18 12 



17. Tegulae long, particularly in male; black spots on 

 secondaries small, confined chiefly to veins; usually 



light-colored species of contrasting colors 



Argyractoides Lange, 1956 — 



— Tegulae in male short; black spots on secondaries 

 usually large, not confined to veins and inwardly 

 edged with a linear, black line; dark-colored species 



Usingeriessa Lange, 1956 



18. Fore wing broad, apex broadly rounded 



Neargyractis Lange, 1956 



— Fore wing slender, apex distinctly pointed 



Argyractis Hampson, 1897 



Key to Genera of North American Nymphulinae 

 Based upon Male Genitalia 5 



1. Costa of valva with 4 long, sickle-shaped processes 



Nymphula Schrank, 1802 



— Costa of valva without sickle-shaped processes ... 2 



2. Eighth sternite with a central, posteriorly projecting 

 process 3 



— Eighth sternite lacking a posteriorly projecting process 



5 



3. Central process of 8th sternite wide, triangulate; 

 aedeagus very long, angulate . . . Contiger Lange, 1956 



— Central process of 8th sternite harrowed terminally; 

 aedeagus shorter, not angulate 4 



4. Uncus long, slender, fingerlike; cupped process near 

 base of tegumen on each side near base, absent 

 Synclita Lederer, 1863 



— Uncus short, wide at base, constricted at middle, 

 spatulate at tip; cupped process near base of tegumen 

 present N ymphuliella Lange, 1956 



5. Aedeagus with 1 to several large, internal spines 

 or cornuti 6 



— Aedeagus with cornuti as groups of small, external, 

 or internal spines, or cornuti lacking 9 



6. Saccus of vinculum wider than basal junction of 

 gnathos; cornutus of several large spines; male with 

 sexual tufts on 8th sternite . . Oxyelophila Forbes, 1922 



— Saccus of vinculum not as wide as basal junction of 

 gnathos 7 



7. Gnathos arising near articulation of valva 



E oparargyractis L-\nge, 1956 



— Gnathos arising distant from articulation of valva 



8 



8. Uncus penciliform, long, slender, greatly surpassing 

 gnathos; sexual tufts on 8th sternite absent; cornutus 

 distinct, but not greatly enlarged 



Chrysendeton Grote, 1881 



— Uncus not penciliform, enlarged apically; sexual tufts 

 in male on 8th sternite and 1st sternite present; 

 cornutus greatly enlarged, recurved 



Argyractoides Lange, 1956 



'After Lange (1956). 



275 

 Lange: Lepidoptera 



Gnathos wide apically and with separate nipplelike 

 process; aedeagus longer than valva; base of valva 



distinctly wider than apical part 



Acentropus Curtis, 1 B8 I 



Gnathos not wide apically, attenuated, and nipplelike 

 process absent; aedeagus same length or shorter than 

 valva; base of valva slightly narrower or about samo 



width as valva at widest point 10 



Valva distinctly narrowed apically; aedeagus clavate, 

 with bulbous base; juxta lobes surround aedeagus 



Undulambia Lange, 1956 



Valva rectangular in general outline, or expanded 

 apically, not narrowed; aedeagus elongate, inflated 

 basally or terminally but not clavate with bulbous 



base; juxta lobes not developed 11 



Sacculus of left valva with thumblike process or small 



papillalike processes with projecting setae 12 



Sacculus of left valva without processes; tufts of 



hair may be present at base of valva 13 



Sacculus of valva with thumblike process set with 

 setae; distal end of sacculus with projecting tuft of 



hairs; apex of valva broadly falcate 



Oligostig*n.a Guenee, 1854 



Sacculus of valva usually with 1 or 2 small setiferous, 

 papillalike processes 6 ; sacculus distally lacking 

 tufts of hair; apex of valva evenly rounded or truncate 



Parapoynx Huoner, 1826 



Tuft of setae arising from verrucalike area at basal 



margin-, or near basal margin of valva 1 J 



Tuft of setae absent 15 



Tuft of setae located above saccus near basal margin 

 of valva; aedeagus 1/2 length of valva; valva greatly 

 elongated with strong costal area and long, apical 



spines Neocataclysta Lange, 1956 



Tuft of setae from base of valva; aedeagus more than 

 1/2 length of valva; valva enlarged, truncate, or 



emarginate apically, apical spines short 



Munroessa Lange, 1956 



Valva with apical thumblike process or harpe near 



costal margin; outer margin of valva truncate 



Oligostigmoides Lange, 1956 



Thumblike process on valva absent 16 



Valva simple, evenly rounded apically; sexual tufts 



on 1st and 8th sternites absent in male 



Parargyractis Lange, 1956 



Valva peaked, or with median, apical, thumblike 

 process; often with apical recurved spines; sexual 



tufts often present 17 



Valva bladelike with median, apical, thumblike process 



and apical recurved spines 



Nearargyractis Lange, 1956 



Valva peaked apically 18 



Juxta with 2 converging lateral arms; spines of gnathos 



greatly produced Usingeriessa L*nge, 1956 



Juxta lacking converging arms; spines of gnathos 

 reduced Argyractis Hampson, 1897 



Key to Genera of North American Nymphulinae 

 Based Upon Female Genitalia 7 



1. Ostium small; base of ductus bursae sclerotized only 

 at ostium Acentropus Curtis, 1834 



— Ostium large, opening into a sclerotized part of ductus 

 bursae 2 



2. Ductus bursae with spines 3 



— Ductus bursae lacking spines 4 



3. Ductus with rows of thornlike spines; bursa copulatrix 

 ovate Argyractis Hampson, 1897 



— Ductus with a valvelike group of large spines some 

 of which project into bursa copulatrix; bursa elongate 



Neargyractis Lange, 1956 



4. Bursa copulatrix with spines or sclerotized plates 

 or bands 5 



P. maculalis (Clemens) 1860, lacks processes. 

 'After Lange (1956). 



15. 



16. 



17. 



