opacus

[ oh-pey-kuh s ]

/ oʊˈpeɪ kəs /

(of a cloud) dense enough to obscure the sun or moon.

Origin of opacus

1615–25; < New Latin, Latin opācus; see opaque

The ancestral stock from which A. opacus developed in Micronesia seemingly reached the area from Melanesia.

The Avifauna of Micronesia, Volume 3 |Rollin H. Baker
The structure of its wing resembles that of A. opacus, but the primaries are more rounded.

The Avifauna of Micronesia, Volume 3 |Rollin H. Baker
Niger opacus lvis, clypeo emarginato, thorace postice rotundato, elytrorum lateribus humeralibus haud incisis.

Illustrations of Exotic Entomology, Volume 1 |Dru Drury
It has a brown iris, and the immatures lack the streaked underparts which are characteristic of A. opacus and other species.

The Avifauna of Micronesia, Volume 3 |Rollin H. Baker

Opacus denotes shady, with reference to a pleasant and beneficial coolness, in opp.

Dderlein's Hand-book of Latin Synonymes |Ludwig Dderlein