Pyrearinus adustus Costa, 1978: 193

Holotype: 1 ♂. Bahia, Braz. X.—1923; Bom Jesus dos Minas; Mus. Exped., O. Farrington Col.; CNHM; [on red] Pyrearinus adustus sp. n. holótipo, C. Costa det. 1978.

Conservation status: Good condition; abdomen and genitalia glued on card under specimen.

Paratype: 1 ♂. Idem.

Conservation status: Idem.

Pyrearinus baliolus Costa, 1978: 194

Holotype: 1 ♂. Blanquillo, I.1947, A. Mesa col.; [red] Holótipo; [on red] Pyrearinus baliolus sp. n. holótipo, C. Costa det. 1978; IB.

Conservation status: Good condition; abdomen and genitalia glued on card under specimen. Paratype: 1 ♂. S. de la Aurora v. Platón—Riviera, Uruguay – 22–25.II.1966, F. Acharai col.; M; [red] Holótipo; [on red] Pyrearinus baliolus sp. n. holótipo, C. Costa det. 1978.

Conservation status: Good condition; abdomen and genitalia glued on card under specimen. Pyrearinus brunneus Costa, 1978: 196

Holotype: 1 ♂. Argentina, Stgo. del Estero, El Pinto, XI–1956; CDA; [on red] Holótipo; [on red] Pyrearinus brunneus sp. n. holótipo, C. Costa det. 1978.

Conservation status: Good condition; genitalia glued on transparent card under specimen. Paratypes: 3 [unknown sex]. Republ. Argentine, Chaco de Santiago del Entero. Rio Dulce; MNHNP; [on red] Pyrearinus brunneus sp. n. paratipo, C. Costa det. 1978.

Conservation status: Good condition.

Paratypes: 2 [unknown sex]. Republ. Argentine, Rio Parana, Territoire des Missiones; MNHNP; [on red] Pyrearinus brunneus sp. n. parátipo, C. Costa det. 1978.

Conservation status: Good condition.

Paratypes: 2 [unknown sex]. Uruguay—Artigas, Ao Catalnau Chico, 23.I.1958; C. Puques; M; [on red] Pyrearinus brunneus sp. n. parátipo, C. Costa det. 1978.

Conservation status: Good condition.

Paratypes: 1♀, 3 [unknown sex]. Argentina, Stgodel Estero, El Pinto, XI. 1956; CDA; [on red] Pyrearinus brunneus sp. n. parátipo, C. Costa det. 1978.

Conservation status: Good condition; female genitalia glued on card under specimen. Paratype: 1 [unknown sex]. Argentina, Coll. Jensen– Baarup; Zool. Mus. Kobenhavn; [on red] Pyrearinus brunneus sp. n. parátipo, C. Costa det. 1978; UZM.

Conservation status: Good condition.

Paratype: 1 [unknown sex]. Mus. Hauschild, 15– [illegible]– 1914; Rio Gde do Sul; UZM; [on red] Pyrearinus brunneus sp. n. parátipo, C. Costa det. 1978.

Conservation status: Good condition.

Paratype: 1 [unknown sex]. Vichadero—Rivera, Uruguay 19.11.961, Carbonell & Colzolessi; [on red] Pyrearinus brunneus sp. n. parátipo, C. Costa det. 1978.

Conservation status: Good condition.