12 BULLETIN 38, UNITED STATES NATIONAL MUSEUM. 



SYNOPSIS OF GEXERA AND GROUPS. 



1. Anterior tibiie not spiuose 2 



Anterior tibi;e spiuose 9 



2. Antenuie of male simple or merely ciliated 3 



Antenute of male serrated and bristled 7 



Anteunaj of male pectinated 8 



3. Abdomen and thorax depressed; primaries subeqnal ; onter margin and apex 



rounded or rectaufjnlar IvIIVNChagkotis, 4 



Abdomen normally cylindric or conic ; w ings trigonate 6 



4. Secondaries yellow Group cltardinyi. 



Secondaries fnscons or smoky, not yellow 5 



5. Thorax not, or obsoletoly, tufted; ordinary spots complete Groni^ cupida. 



Thorax more or less evidently tufted ; orbicular incomplete-, open superiorly, 



Group exsertisiigma. 

 C. Primaries elongate, thorax with distinct anterior and posterior divided tufts, 



Adelphaguotis. 

 Primaries wide and frail; thoracic tuftiugs indefinite ; costa not arched, 



Platagrotis. 

 Primaries unusually wide, costa strongly arched ; thoracic tuftings distinct, 



Eueretaghotis. 



7. Thorax with a sharp crest; wings as in group cupida Abagkotis. 



8. Wings broad ; costa of primaries arched Semiophora. 



9. Front smooth «. .' 10 



Front rough, tuberculated, or pitted 15 



10. Vestiture long, loose, and hairy ; antenu;e various Pachnobia. 



Vestiture mixed scales and hair 11 



11. Antennie of male with joints marked laterally with tufts of bristly hair, 



Setagrotis. 



Antennje of male bipectinated Aguotis. 



Antenn.'e of male simple or merely ciliated 12 



12. Primaries regularly widening, apices distinct, not rounded Peuidkoma, 13 



Primaries with apices rectangular or rounded Noctua, 14 



13. Thorax with distinct anterior and posterior divided crest ; primaries quite 



strongly produced at apex Group smtcia. 



Thoracic tufts not divided; apices of primaries less produced Group incivis. 



14. Palpi clavato toward tip; transverse lines and ordinary spots distinct. 



Group normau'iaua. 

 Palpi equal throughout; transverse lines and ordinary spols becoming ob- 

 solete or confused ^ Group elandentina. 



15. Antenme of male simple or ciliate only 16 



Auteunae of male pectinated or serrate and bristled 18 



If). Primaries narrow, elongate, subeqnal, ordinary spots always, lines usually, dis- 

 tinct; abdomen depressed Ciiorizaghotis. 



Primaries normally wide, abdomen not depressed Riiizagrotis, 17 



17. Maculation normal, not strigose; ordinary spots distinct Group ahnormis. 



Ordinary spots more or less obscured by longitudinally strigate marks; 



transverse lines when evident, single Group ncdivis. 



Ordinary spots more or less completely conduent, maculation longitudinally 



strigose; transverse lines wanting; colors pale Group cloanthoidcs. 



18. Clasiier of male genitalia consisting of a long, corneous hook, or shorter, beak- 



like process 19 



Clasper of male genitalia bifurcate Cahneades, 20 



19. Wings short and wide, apices not pointed ; colors dark Femia. 



Orbicular open above, costa paler Group suhgotJdca. 



