Amathia indistincta Butler 1882: 397; Angulo & Casanueva 1981: 26.

Physoloba indistincta (Butler 1882) Fletcher 1953: 378; Angulo & Casanueva 1981: 31; Scoble 1999: 755.

Rhopalodes viridularia Dognin 1906: 207; Scoble 1999: 755.

Type: Amathia indistincta Syntype: 1 female, las Zorras, Chile (BMNH) (examined). Rhopalodes viridularia Syntypes: 1 male and 2 females, Punta Arenas, Chile (USNM) (not examined).

Material examined (21 females, 2 males). Valparaíso. Syntype: 1 female, las Zorras, Chile (BMNH). Ñuble. Chillán: 1 female, 17-10-1959 (MZUC-UCCC). Concepción. Concepción: 1 female, 01-10-1959; 1 female, 03-10-1959; 1 female, 07-10-1959; 1 female 08-10-1961; 1 female, 11-12-1964; 1 female, 29-07- 1985 Carrasco coll; 1 female 07-08-1985 Carrasco coll. Chiguayante: 1 female, 29-10-1961; 1 female 30-10- 1961; 1 female, 12-11-1961 (MZUC-UCCC). Malleco. Curacautín: 1 female, 07-10-1948 (MZUC-UCCC). Valdivia. Valdivia: 3 females, 30-09-1987; 1 female 21-10-1987 (MZUC-UCCC); 3 females, 30-04-1964 Wagenknecht coll; 1 female, 12-1964; Wagenknecht coll; 1 male, 30-04-1964; Wagenknecht coll; 1 male, 12- 1964 Wagenknecht coll (UMCE).

Diagnosis. Hoplosauris indistincta can be distinguished from the other species of the genus by pale brown and white scales covering its head, thorax, forewings and abdomen. Male has a convex and hairy vesicle on the hindwings. Vesical cornuti formed by two groups of long and thin spines. One group of spines is twice the length of the other. Female with microspines arranged like a belt, encircling the corpus bursae. This character is the autapomorphy for the species.

Redescription. Male (Figure 1f). Head: Antennae sub-apically thickened, covered by dark brown and white scales. Vertex and frons covered by white scales. Labial palpi with white and dark brown scales. Thorax: light brown and white, the same for the patagia and tegula. Tegula with piliform scales extending posteriorly. Forewings: upperside white with some dark brown scales. Basal line light brown. Medial line with a dark brown spot near the anal zone. Terminal line represented by dark brown semicircles. Discal mark brown reddish. Underside light brown. Hindwings: with a hairy convex vesicle on the anal margin; upperside whitish, underside white. Discal cell absent. Abdomen covered by white scales. Fore and mid legs with dark brown and white intercalated stripes. Hind legs white. Female. Similar to the male, hindwing without hairy convex vesicle in the anal margin.

Male genitalia (Figures 8a, c). Uncus curved, hairy, with acute apex, ½ the length of the valvae. Valvae subrectagular, slightly thicker towards the apex. Androconia on the subapical region of the valvae. Costa slightly sclerotized. Ventral margin of the valvae transversally with neckline on its subapical region. Semicircular saccus. Tubular aedeagus. Vesical cornuti formed by two groups of long and fine spines. One group of spines twice the length of the other. The group of long spines, ½ the total length of the aedeagus. Female genitalia (Figure 8b). Sterigma membranous. Corpus bursae sclerotized and elongated, transversally striate on its anterior half. Microspines present on its internal surface, arranged like a belt, encircling the corpus bursae entirely. Posterior corpus bursae membranous. Anterior and posterior apophyses sub-equal. Ductus bursae ¼ the length of corpus bursae. Ductus seminalis indistinguishable.

Distribution. This species is distributed between 33º S and 40º S, in the provinces of Valparaíso and Valdivia.

Flight period. Specimens captured during the months of April, July-December. There are no records from other months.