Lord Rothschild on new Heterocera. 487 
to each other; the apical quarter of the segment rather 
strongly broadened, the whole segment as long as the hind 
coxa and trochanters combined. Areolet very large, about 
half as long again on the radius as on the cubitus, the second 
abscissa of the radius fully as long as the first and very little 
shorter than the third. Second recurrent nervure received 
just beyond one quarter from the base of the second cubital 
cell. 
Hab. Vieng Vai, Haut Mékong ; June 10, 1918. 1 9. 
Nasily distinguished by the dark fuscous wings from all 
other known Oriental species of the genus. The name 
Mansa, Tosq. (1896), has priority over Colganta, Cam. (1902), 
which must sink as a synonym. 
Family Braconidae. 
Subfamily Hezcowry-z. 
Flelcon unicornis, Turn. 
Helcon unicornis, Turn, Ann. & Mag. Nat. Hist. (9) i. p. 172 (1918). 
2. 
Hab. Tong Lap, Haut Mékong ; April 30, 1918. 
This species seems to resemble closely Wroughtonta cor- 
nuta, Cam., placed by that author among the Mvaniide, and 
I think it quite possible that my name may have to sink asa 
synonym. Cameron’s description is not very clear, and was 
taken from a specimen with broken antenne. But, on the 
whole, I think there can be no doubt that the genus Wrough- 
tonta belongs here, and should sink as a synonym, 
XLIX.—Deseription of a new Genus and Two new Species of 
Heterocera. By Lord Roruscuip, F.R.S. 
Spilosoma ignivagans, sp. n. 
3. Very closely allied to erythrophleps, Hmpsn., but with 
less red on fore wings and fewer pale markings on hind 
wings. 
Antenne black, pectus and legs sooty-slate, frons and 
vertex rufous-orange; thorax rufous-orange, with a sooty dot 
on tegule and sooty streaks on patagia ; abdomen above 
rufous-orange ringed with sooty black, below white. 
Fore wing slate-brown with orange-scarlet nervures ; three 
ill-defined orange-scarlet patches on basal half of costa; two 
rufous-orange spots in cell and one beyond; four irregular 
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