Isanthrene columbiana Rothschild, 1911

Rothschild, W. (1911). New Syntomidae and Arctianae. Novitates Zoologicae
18: 24-45; p. 26.

13. Isanthrene columbiana sp. nov.

♀. Differs from I. tryhanei in having entirely black legs, and much broader
forewings, which are paler hyaline-yellowish; the costa of forewings is
orange-yellow for four-fifths of its length, and basal half of inner margin
orange-yellow.

Length of forewing: 26 mm.; breadth 10 mm.

Hab. Bogota, Colombia, 1 ♀.

The species it is compared with, I. tryhanei, is described immediately
before (Rothschild 1911, p. 26):

12. Isanthrene tryhanei sp. nov.

♀. Legs, coxae black, femora half black half crimson, fore and middle tibiae
crimson, hind tibiae black tipped with crimson, tarsi black; palpi black;
frons black with central yellow spot; vertex black; antennae crimson
orange-rufous; thorax velvety black; abdomen except last three segments
velvety black with a median steel-blue spot on each segment, two subdorsal
yellow spots on first segment, and two lateral yellow streaks on second
segment, last three segments of abdomen steel-blue. — Wings deep
hyaline-yellow, basal two-thirds of costa of forewing orange-yellow, inner
margin black, the basal half widest, reaching vein 1, outer margin black,
expanding widely at termen between veins 4 and 9, abdominal area of hindwing
and margins black.

Length of forewing: 20 mm., x 14 in breadth.

Hab. St. Ann's, Trinidad (V. E. Tryhane), 1 ♀.

Hampson, G. F. (1914). Catalogue of the Lepidoptera Phalaenae in the British
Museum. Supplement, vol. 1 (Amatidae and Lithosiadae): pp. 99-100.

346 a. Isanthrene columbiana.

Isanthrene columbiana, Roths. Nov. Zool. xviii. p. 26 (1911), & xx. p. 471,
pl. xiv. f. 25.

♀. Head and thorax black-brown; antennae orange-red, the basal half of
shaft black above; pectus with lateral yellow spots; abdomen black-brown
shot with metallic blue, the basal segment with bifurcate yellow dorsal
patch and some yellow at sides, the 2nd segment with conjoined subdorsal and
lateral spots, the 3rd segment with small subventral white spots. Fore wing
hyaline, the veins and margins black; a golden-yellow streak below costa to
beyond middle and streaks above and below basal half of vein 1; the black on
termen expanding widely on apical area, and dentate at vein 2. Hind wing
hyaline, the veins, margins, and inner area black; some yellowish at base;
the black on termen expanding slightly towards apex; the underside with the
cell and costal area to beyond middle orange-yellow, the inner area
orange-yellow with slight blackish streaks.

Hab. Colombia, Bogota, type ♀ in Coll. Rothschild. Exp. 54 millim.

Draudt, M. (1915). Isanthrene. In: Seitz, A. (ed.), The Macrolepidoptera of
the World, vol. 6, The American Bombyces and Sphinges (English edition):
p. 47, pl. 10 b.

I. columbiana Rothsch. (10 b) from Bogota (Colombia) differs from the
preceding species by considerably broader forewings which are less
intensely yellow, and by quite unicolorously black legs; besides almost the
whole costal margin and the basal half of the proximal margin are orange
yellow.

The preceding species in Draudt is I. tryhanei (p. 47):

I. tryhanei Rothsch. (10 b). Head and palpi black, on the forehead a yellow
spot; thorax velvety-black; abdomen velvety-black, the dorsum of each
segment exhibits a steel-blue spot, the 3 last rings quite steel-blue; on
the first segment yellow subdorsal spots, on the second yellow lateral
streak-spots. The legs and forehips are black, half of the femora red,
anterior and middle tibiae red, hind tibiae red-speckled, tarsi black.
Antennae red. Wings yellow hyaline, the basal two thirds of the costal
margin orange, the proximal margin broadly black; the black distal margin
expands, from the lower radial vein, to a large apical spot. Proximal
margin of the hindwing black. 1 ♀ from Trinidad.