March, 1914.] FORBES : NOCTUID.E OF NORTH AMERICA. 9 



Palpi porrect, with triangularly scaled second, and porrect concealed third 

 joint, wings broader Riviila. 



69. Palpi rather closely scaled, upturned to vertex or above 70. 



Palpi with first joint very long, third recurved over head and thorax, 



bearing a pencil of long hair Palthis (^. 



Palpi projecting beak-like about the length of the thorax, with blade-like 

 second and broadly scaled third joint, or rarely (Renia salusalis (^) 

 shorter with a pencil on inner side 73. 



70. Two radials (R3 and R^) stalked, male antennae pectinate. . . . Melanomma. 

 Three or four radials stalked, antennae various, rarely pectinate .... 71. 



71. R, free and well separated from the stalk, occasionally stalked with R,, 



Hyperstrotia (31). 



R3 stalked, in Tetanolita shortly, with Rs+i y2. 



y2. Palpi upturned about to vertex, male with normal antennae and fore legs, 



antennae simple, R5 free Ozarba (32). 



Palpi upturned to twice height of head, recurved ; male antennae with a 

 scale-tuft a third way out, and fore legs with large pencils of hair; 

 Rj well stalked Tetanolita. 



73. Fore wing cleft at middle of outer margin Gaberasa (^. 



Fore wing with a hyaline spot, falcate with angled outer margin, 



Dercetis. 

 Fore wing opaque, obscurely angled or rounded 74. 



74. Males, — frenulum simple, fore legs strongly modified 75. 



Females, — frenulum of three bristles, fore legs normal 76. 



75. Antennae with a knot and claws near middle Renia. 



Antennae normal Heterogranima. 



y6. Fore wing more than twice as long as wide, folded in repose. . . . Palthis. 



Fore wing less than twice as long as wide, normally not folded in 



repose 77- 



77. R2 stalked, outer edge of fore wing only slightly sinuous or bent. . 78. 

 R2 from cell, outer edge of fore wing distinctly angulated .... Gaberasa. 



78. Normally brown or blackish Renia. 



Light grayish luteous, with olivaceous markings Heterogranima. 



79. Expanse over four inches; front smooth, with a vertical ridge, very 



narrow 80. 



Expanse under three inches, front without a long vertical ridge 81. 



80. Dark brown, male hind metatarsus with a double fringe of long dense- 



set bristles, hind wing bent Erebus. 



80. Pale gray and brown, male metatarsus normal ; hind wings scalloped, 



Thysania. 



81. Fore tibia zvith a claw at tip, the legs otherwise normal 82. 



Fore tibia unarmed except for the usual epiphysis on the inner side, or 



else (Deltoids) strongly modified, with large fan-like tufts .... 90. 



82. Front with a raised ring 83. 



Front at most rough and prominent 87. 



83. The ring produced into a point below 84. 



The ring regular and even 83. 



