Setiostoma thiobasis Duckworth 1971

Setiostoma thiobasis

Alar expanse 13 mm.

Eye index .60 female

Antenna dark brown, scape flecked with yellow, faint yellow annulations on first few segments beyond scape; sensory hairs of female approximately 0.5 × diameter of shaft. Head yellow, a few brown scales along eye margin. Labial palpus dark brown basally, yellow beyond. Maxillary palpus yellow. Base of proboscis dark brown. Thorax and tegulae yellow suffused with pale green. Legs dark brown; foreleg with coxa sprinkled with white, two tarsal rings, tip, white; midleg with two tarsal rings, tip, white; hindleg with tibial spurs, two tarsal rings, tip, white. Forewing yellow suffused with pale green basally, concolorous, and continuous with thorax and tegulae, a few brown scales in anal area, distal margin of yellow area bordered by a dark brown line immediately paralleled by a broad, transverse band of iridescent blue violet. Apical portion of forewing dark brown, irregularly patterned with iridescent blue violet. Cilia gray brown. Hindwing dark brown with white patch on anterior margin; cilia dark brown basally, lighter brown beyond.

MALE GENITALIA.—Unknown.

FEMALE GENITALIA (WDD 3947).—Ovipositor elongate, posterior apophyses very long, slightly recurved at apices, anterior apophyses broken; lamella postvaginalis lightly sclerotized with a median groove, lamella antevaginalis membranous; ostium slightly larger than width of ostium bursae, ostium bursae small, lightly sclerotized; ductus bursae membranous, extremely long, exceeding the length of the abdomen, a small diverticulum just before junction with corpus bursae; corpus bursae membranous, transition from ductus bursae distinct, signum a large, diamond-shaped plate with a median depression and numerous upright flanges.

TYPE.—In the British Museum (Natural History).

TYPE LOCALITY.—Santa Catharina, Brazil.

HOST PLANT.—Unknown.

DISTRIBUTION.—Known only from the type locality.

Rectiostoma thiobasis is a moth in the family Depressariidae. It was described by W. Donald Duckworth in 1971. It is found in Brazil.

The wingspan is about 13 mm. The forewings are yellow suffused with pale green basally, concolorous, and continuous with the thorax and tegulae. There are a few brown scales in the anal area and the distal margin of the yellow area is bordered by a dark brown line immediately paralleled by a broad, transverse band of iridescent blue violet. The apical portion of the forewing is dark brown, irregularly patterned with iridescent blue violet. The hindwings are dark brown with a white patch on the anterior margin.