1864.] 
439 
DICHAGEAMMA, nov. gen. 
Anterior wings elongate, straight along costal and internal margins, 
external margin moderately rounded; apex acute. Head applied closely 
to the thorax, compressed laterally, tufted between the antennae. Palpi 
not exceeding the head, densely clothed with hair, third article short. 
Abdomen somewhat squarish and flattened, not exceeding posterior 
wings. Antennae long, minutely bi-pectinate in the % , simple in the 9 • 
Legs well clothed with hair, hind tibiae with four short spurs, the inner 
pair the longest. Posterior wings broad, having vein 5 (H-S) some¬ 
what weaker than 4 or 6, more remote from 6 than from 4. 
The two hitherto undescribed species of Noctuina composing the 
present genus, coincide exactly in their ornamentation and structure, 
and, though they may ultimately be referable to an already established 
genus, in the absence of any approximating material I describe them 
under a new one. The anterior wings very gradually increase in width 
to the external margin, and are as long as the entire body, including 
thorax and head. The median lines are narrow, straight (especially 
the transverse anterior), and divide the wing into three nearly equal 
sized spaces. The orbicular spot is wanting, the reniform distinct, dif¬ 
fering in form in the two species; the subterminal line is broad, bor¬ 
dered on either side by a lighter shade; the terminal line very clearly 
defined, semi-lunulate, continued. The species appear to me to ap¬ 
proach most nearly the genus Mi/thimna, and especially to our species 
Mt/tMmna paeudarg^ria Gruenee, with which they coincide in the shape 
of the external margin of the anterior, and approximately share in the 
pterogostic characters of the posterior, wings. 
The different palpal structure and abdominal proportionate length 
and shape, together with the differing ornamentation and spur struc¬ 
ture of the hind tibim, have induced me to erect a new genus for these 
two species, a proceeding which their perfect coincidence in the above 
mentioned characters seems to justify. 
Dichagramma Walkerii nov. sp. (Plate 9, fig. 5.) 
Anterior wings dull ochraceous, mixed with brownish, lighter shaded 
in terminal and subterminal spaces. Transverse anterior line distinct, 
darker shaded, straight, composed of two narrow lines with a central 
light shade. Orbicular spot absent; reniform, light ochraceous, vague. 
Median shade line distinct, running straightly from internal margin to 
