558 William T. M. Forbes 



40. DIASEMIA Guenee 



Palpi about as in Loxostege; rather short. Maxillary palpi large, trian- 

 gular; male antennae broad and typically subserrate in male. Fore wing 

 typically with falcate apex; venation normal, with R- divergent. Hind wing 

 with apex subfalcate, outer margin excavate below it; M :; and CUj approximate; 

 cell two-fifths length of wing; front rounded. 



Only the type species is normal in structure, janasslalis is probably not really 

 congeneric. 



1. D. ramburialis Duponchel. White, striate with yellow and dusted and mottled 

 with brown-black; the white showing especially' as a very irregular postmedial line, 

 widened on costa and forming a contrasting patch on inner margin. Fringe cut with 

 white. Hind wing . with white mostly in broad antemedial and medial bands, 

 with a solid black band between them. 15 mm. 



Europe; Atlantic States; seen only from Florida. 



2. D. janassialis Walker. Male antenna? strongly annulate, with rows of raised 

 scales; hind wing excavate opposite cell, but not falcate; venation as in Pyrausta; 

 palpi long, beaklike. Black, with heavy white postmedial line, discal spot, partial 

 antemedial line and other usual markings; not at all powdery or striate. 



Southern States, north to North Carolina; not known in our territory. 



3. D. magdalena Fernald occurs north to North Carolina. It is yellow, with 

 fine silvery ante- and postmedial lines converging to the inner margin, and with 

 a similar terminal line and confused discal marks. 



41. TITANIO Hiibner 



(Botis, in part) 



Similar to Pyrausta; front more prominent, rounded out and rough-hairy 

 (fig. 337); gena a third as wide as eye, pale and conspicuous in pollinalis; eye 

 narrower than front, with a chitinized band behind it; vestiture rough and 

 more hairy than usual; with tufts on the tips of the large maxillary palpi. 



This is a subarctic development of Pyrausta, and apparently intergrades with 

 it. Two or three species placed here in Titanio have been generally considered 

 Pyraustas, but have the characteristic small diurnal eyes of this genus. 



Key to the species 



1. Black with two white spots on fore wing 1. pollinalis. 



1. Gray. 



2. Postmedial line straight, whitish 4. marginalis. 



2. Postmedial line dark, denticulate and sinuate 2. ephippialis. 



2. Markings obsolete 3. torvalis. 



1. Ground of hind wing yellow (insequalis group of Pyrausta). 



1. T. pollinalis Schiffermiiller. Black: two white spots on fore wing and a 

 broken median fascia on hind wing. 20 mm. 



May and June; August. Larva on broom_ and other Legurninosae. 

 Europe; reported from Pennsylvania. 



2. T. ephippialis Zetterstedt. Gena black, naked. Dark ash gray, somewhat 

 powdery, especially the darker base; antemedial line wavy, oblique outward, dark; 

 postmedial well out; excurved above, extending far in below cell, enlarging into 



