68 
CHROSTOSOMA. By Dr. M. Draudt. 
anthracina. 
mosca. 
echemus. 
unxa. 
irimacula- 
tum. 
cardincilis. 
semi- 
rubrum. 
pellucidum. 
si'iona. 
patricium. 
tricolor. 
mara thurn. 
Ch. anthracina spec. nov. (12 1) resembles Amyces anthracina (20 i),. particularly in the female: the 
body is sooty black. Collar, shoulders and first abdominal ring subdorsally with minute scarlet spots; below 
them lateral whitish spots on the first segment. Forewing in the first two thirds sooty black, warming into 
red-brown towards the following whitish marginal third; at the apex a narrow, grey marginal spot; at the 
base, below the median, a red streak-like spot. Hindwings hyaline, on the veins, at the apex and inner angle 
broadly blackened. The A is in the basal part, in and below the cell, very thinly scaled, so that oblong hyaline 
spots are produced here. This very interesting species is before me in both sexes from East Colombia (Pacho, 
2200 m). (Fassl.) 
Ch. mosca Dogn. Body unicolorously black, above with a slight blue-green reflection; the first 
abdominal ring is red. Wings hyaline with black veins and margins. Expanse of wings: 22 mm. Ecuador (Loja). 
Ch. echemus Or. (= dolens Wkr.. stulta H .-Schdff.) (12 k) differs from decisa and haematica which 
are somewhat larger by the hyaline, not white basal half of the hindwing. The body is brown-black; on the 
shoulders and on the middle of the first abdominal segment red-spotted; on the sides of the abdomen indistinct, 
metallic-blue, small spots. The ventral side and the femora are whitish. The dull-hyaline wings are blackish 
brown at the margins and on the veins, the disc is clouded in brownish round the middle spot. The hyaline 
hindwings are blackish-grey in the marginal half and on the broad inner-marginal part. Guiana; Amazon. 
Ch. unxa Druce (12 1). Two subdorsal, red spots on the first abdominal segment, instead of one dorsal 
spot, separate the species from the preceding; vertex and collar with metallic-blue scales, on the ventral side 
only the first 4 rings are white. The hyaline wings have a yellow tinge. Expanse of wings: 32 mm. Panama 
(Chiriqui). 
Ch. trimaculatum Strand in the marking greatly resembles decisa Wkr. from which it differs above all 
by the presence of the upper median vein of the forewing, being absent in decisa : furthermore, the black apical 
spot of the forewing is cut off straight, inside not concave; also the discal band is sharply defined; the red spot 
on the 1st abdominal ring is sharply marked, triangular, showing with its apex in front. Expanse of wings: 
27 mm. Peru (Urubamba). 
Ch. cardinalis Schaus (12m) has an entirely scarlet body; only the head is black with a white forehead; 
on the red legs the tibiae and tarsi are blackish-brown; the hyaline wings with black margins and apical spots 
are at the base of the forewings scarlet; the inner-marginal part of the hindwing is black, at the border red- 
haired. At once distinguishable from the exteriorly most similar Cosmosoma m elan opera (13 k) by the quite 
red abdomen without the black anal apex. Colombia: 1 A before me from the Rio Aguaca Valley, West Cor¬ 
dilleras, 2000 m. (Fassl.) 
Ch. semirubrum Hmps. (12 m). Head, thorax and the 3 last abdominal rings are black; forehead 
white-spotted; on the shoulders scarlet spots; the first abdominal segments scarlet. The hips and posterior 
tarsi are white. The hyaline forewings exhibit a black median band and very extensive, black apical spots. 
From Brazil (Sao Paulo). 
Ch. pellucidum Schaus is easily recognizable by the ochreous yellow body, only the 2 last abdominal 
rings, antennae and legs are black, the latter somewhat yellow striped. Wings hyaline with black veins, margins 
and apical spots, the forewings at the base orange. Expanse of wings: 25 mm. Peru (Carabaya). 
Ch. sitiona Schaus differs from the preceding by its larger size, black head, antennae and palpi, and 
quite black legs with yellow hips. Expanse of wings: 29 mm. Costa Rica. 
Ch. patricium Schaus. Body brown-black, forehead metallic-blue, similar spots are on the collar 
and thorax, the shoulders being red-spotted. First abdominal ring with subdorsal, carmine spots and laterally 
blue-spotted, venter white. Forehips opalescent white. The hyaline forewings exhibit a broad, black middle 
band terminating into the inner angle, and a large apical spot; hindwings with a broad, black border. Expanse 
of wings: 29 mm. Costa Rica. 
Ch. tricolor Fldr. (12 m) greatly resembles Mimagyrta pulchella. Body black, anterior body marked 
with white, abdomen subdorsally striped in a bluish white, venter white. The black forewings are at the inner- 
marginal base metallic blue; in and below the cell-end there is a large, orange oblique spot, behind it a hyaline 
oblique band. Hindwing in the inner-marginal part metallic-blue; in below and behind the cell a long, narrow 
hyaline spot. Expanse of wings: 30 mm. Amazon. 
Ch. marathum Druce. Body quite black. Collar bordered with red. Forewings smoky-brownish 
hyaline; behind the middle a broad oblique band of a semi-diaphanous, white colour, extending from the costal 
margin to the inner angle. Hindwings hyaline, at the apex and inner margin dusted with black. Expanse of 
wings: 26 mm. Ecuador. 
