Cosmosoma stilbosticta (Butler, 1876)

Butler, A. G. (1876). Notes on the Lepidoptera of the family Zygaenidae, with
descriptions of new genera and species. Journal of the Linnean Society of
London, Zoology 12: p. 391. (Described as Ilipa stilbosticta.)

7. I. STILBOSTICTA, n. sp.

Head black, frons with two white dots; origin of antennae and a central spot
on back of head white; antennae black; pterygodes black, thorax black, with a
large central white spot on prothorax; abdomen golden yellow, with the three
terminal segments black; wings hyaline-white, veins black; primaries with apex
and margins black, a white spot at base of costa and a white point near base
of subcostal nervure; secondaries with apex, outer, and abdominal margin
black, costal margin dark grey: pectus black, trochanters of front pair of
legs white; abdomen as above: expanse of wings 38 millims.

♂, ♀. Pacho, New Granada (Janson). Two specimens, B.M.

Most nearly allied to I. fulviventris, but differing in its greater size and
the black anal segments of the abdomen.

Hampson, G. F. (1898). Catalogue of the Lepidoptera Phalaenae in the British
Museum, vol. 1, Syntomidae: p. 253, pl. IX fig. 11. (As Cosmosoma
stibostictum.)

547. Cosmosoma stibostictum.

Ilipa stibosticta, Butl. Journ. Linn. Soc., Zool. xii. p. 391 (1876); Druce,
Biol. Centr.-Am., Het. i. p. 61; Kirby, Cat. Het. p. 145.

Head and thorax black; frons white; vertex of head and thorax with white
spots; fore coxae white; abdomen yellow, the last three segments black; wings
hyaline, the veins and margins black. Fore wing with two white points at base;
the terminal band very wide on apical area and expanding at tornus. Hind wing
with the terminal band wide at apex.

Ab. 1. Head, thorax, and coxae without white patches; fore wing without white
points at base.

Ab. 2. Head and thorax without white spots on vertex; patches of metallic blue
on vertex of head and thorax and black segments of abdomen; fore wing with
metallic blue spot replacing the outer white speck.

Hab. Panama, Bugaba, Veragua (Champion), Godman-Salvin Coll.; Colombia,
Cundinamarca, type and ab. 1, Bogota (Vergara), ab. 2. Exp. 38 millim.

Draudt, M. (1915). Cosmosoma. In: Seitz, A. (ed.), The Macrolepidoptera of the
World, vol. 6, The American Bombyces and Sphinges: p. 82, pl. 14 g. (As
Cosmosoma stibosticta.)

C. stibosticta Btlr. (14 g) differs from braconoides by the absence of the
discoidal spot and an entirely unmarked abdomen. Panama, Colombia, Ecuador,
Bolivia. -- The white spots on the head, thorax, hips and bases of the wings
may be absent altogether: dealbata form. nov. (= ab. 1 Hmps.); but instead
there may occur metallic blue spots both at the places of the white spots and
on the black abdominal apex: caerulescens form. nov. (= ab. 2 Hmps.).

The species it is compared with, C. braconoides, is described by Draudt
immediately before (p. 82, pl. 14 g) as follows:

C. braconoides Wkr. (14 g). Except the last 3 segments the abdomen is
peculiarly diaphanous brownish-yellow, which makes the insect appear
repulsive; all the rest is blackish-brown, just like a series of dorsal spots
varying greatly in extent on the abdomen. On the head and base of the forewing
2 white dots each. Discoidal spot very large. Widely distributed in Mexico,
also in Honduras.