Setiostoma cirrhobasis Duckworth 1971

Setiostoma cirrhobasis

Alar expanse 11–15 mm.

Eye index .60 male, .66 female.

Antenna dark brown, scape yellow flecked with brown, segments beyond scape annulated with yellow to basal fourth; sensory hairs of male approximately 3 × diameter of shaft basally, gradually reduced to .5 × at apex; those of female 0.25–0.5 ×. Head yellow, an occasional brown scale along eye margins. Labial palpus dark brown basally, yellow beyond. Maxillary palpus yellow. Base of proboscis dark brown. Thorax and tegulae yellow. Legs dark brown; foreleg with three tarsal rings, tip, white; midleg with two tarsal rings, tip, white; hindleg with tibial spurs white flecked with brown, two tarsal rings, tip, white. Forewing yellow basally, concolorous and continuous with thorax and tegula; distal margin of yellow area bordered by a dark brown line immediately paralleled by a broad, transverse band of iridescent blue-violet scales. Cilia dark gray brown. Hindwing dark brown with white patch on anterior margin, some white scaling, white hair pencils in anal area near base; cilia dark brown basally, light brown medially, white apically.

MALE GENITALIA (WDD 3941).—Uncus recurved, blunt apically; gnathos separate, small, arms simple; harpe simple, costal margin with a fold near midpoint, bearing a small cluster of multilobed setae on outer margin of fold, lobes of specialized setae closely appressed, forming a comblike mass at apex, apical third of ventral margin deeply excavate to apex; vinculum broad, ends closely approximate below anellus; anellus small, bearing two upright lateral lobes of approximately uniform width throughout, rounded apically; aedeagus slightly expanded basally, acute apically, vesica armed with a large number of short, heavy cornuti.

FEMALE GENITALIA (WDD 3940).—Ovipositor elongate, posterior and anterior apophyses approximately equal in length, very sinuate; lamella postvaginalis a simple plate, lamella antevaginalis small, ovoid; ostium small, ostium bursae membranous; ductus bursae with a sclerotized ring just anterior of inception of ductus seminalis, followed by a small area of membrane, remainder of ductus bursae sclerotized, increasing in diameter anteriorly; corpus bursae membranous, transition from ductus bursae distinct, signum a large ovoid plate with a median depression and numerous upright flanges.

TYPE.—In the National Museum of Natural History, USNM 71436.

TYPE LOCALITY.—13 kilometers north of San Salvador, El Salvador.

HOST PLANT.—Unknown.

DISTRIBUTION.—Presently recorded from the humid low highlands of Guatemala and El Salvador.

ADULT RECORDS.—EL SALVADOR: 13 km N San Salvador (February). GUATEMALA: San Sebastian (no date).

Rectiostoma cirrhobasis is a moth in the family Depressariidae. It was described by W. Donald Duckworth in 1971. It is found in the humid low highlands of Guatemala and El Salvador.

The wingspan is 11–15 mm. The forewings are yellow basally, concolorous and continuous with the thorax and tegula. 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 scales. The hindwings are dark brown with a white patch on the anterior margin, some white scaling and white hair-pencils in the anal area near the base.