Lewis & Short

Arcăs, ădis, m., = Ἀρκάς.

  1. I. Son of Jupiter and Callisto, the progenitor of the Arcadians, after his death placed as a constellation (Arctophylax) in heaven, Ov. F. 1, 470; 2, 190; id. M. 2, 468; 2, 497; Hyg. Fab. 176, and Astr. 2, 4 (cf. Apollod. 3, 8, 2).
  2. II. An Arcadian; plur. Arcădĕs, um, m. (acc. Gr. Arcadăs, Verg. A. 10, 397), = Ἀρκάδες, the Arcadians.
    1. A. As the most ancient men, Plin. 7, 48, 49, § 154; Ov. F. 2, 289 al.
    2. B. As skilled in pastoral music: Tamen cantabitis, Arcades, inquit, Montibus haec vestris; soli cantare periti, Arcades, Verg. E. 10, 31: Arcades ambo, Et cantare pares et respondere parati, id. ib. 7, 4 (cf. id. ib. 4, 58 sq.; Theocr. 22, 157; Polyb. 4, 20).
      Hence, Arcas,
    3. C. Κατ’ ἐξοχήν.
      1. 1. Mercury, who was said to have been born on the Arcadian mountain Cyllene (cf. 1. Arcadia, B.), Mart. 9, 35, 6; Luc. 9, 661; Stat. S. 5, 1, 107.
      2. 2. Parthenopœus, the son of Atalanta from Arcadia, Stat. Th. 8, 745; 12, 805.
      3. 3. Tyrannus, i. e. Lycaon, grandfather of Arcas (a poet. prolepsis), Ov. M. 1, 218.
      4. 4. Bipennifer, i. e. Ancœus, Ov. M. 8, 391.
  3. III. Adj., = Arcadius, Arcadian, Verg. A. 12, 518; Mart. 5, 65, 2; Stat. S. 5, 2, 123; id. Th. 7, 94; Sil. 6, 636.