Orieosia albigrisea, Vos, 2022

Vos, Rob De, 2022, The genus Orieosia Bucsek, 2012 also found in New Guinea, with description of two new species (Lepidoptera: Erebidae, Arctiinae, Lithosiini), Zootaxa 5188 (2), pp. 179-188 : 183

Orieosia albigrisea spec. nov.

( Figs 8–9 , 12 , 15 , 19 )

Holotype: ♂, RMNH.INS.1108865, Indonesia, Papua, Kecamatan Abenaho, Pass Valley, 1950 m, 3˚51′S–139˚05′E, 11–17.ii.2005, at light, disturbed montane forest, UNCEN-ZMA Expedition , Papua Indonesia 2005.

Paratype: 1 ♀, RMNH.INS.1108866, Indonesia , Papua, Kecamatan Nipsan, Walmak, 1710 m, 4˚07′S–138˚36′E, 31.i–09.ii.2005, at light, cultivated area, UNCEN-ZMA Expedition , Papua Indonesia 2005.

Diagnosis: Larger than other Orieosia species. The colour of the wings is whitish gray instead of the buff colour in other species. The for Orieosia typical three dots on the forewing are present, as well as some suffusion at the costa and dorsum and a vaguely visible subterminal row of small dots, which is not seen in any other species in the genus. Like in other Orieosia species the apex of the hindwing has a dark suffusion.

Male valve with a straight apex with two thorns, one at each corner, in hypopolius and other species the apex is convex with only one thorn. Aedeagus with on vesica a group of numerous small needle-shaped cornuti, instead of the three larger ones in hypopolius . Scobinated field wider and with larger chitinous drops than in hypopolius .

Female genitalia with a shorter antrum than in hypopolius , and sclerotized part of the bursa copulatrix smaller, densely covered with fine spikes. Cervix bursae an membranous hanging lobe at the left side.

Description: Fwl. ♂ 8.5 mm, ♀ 10.5 mm. Head, thorax, including patagia and tegulae, and abdomen gray. Antennae in male rather short and thick, serrate at one side, in female the antennae are much thinner, filiform with scarce setae. Legs greyish white. Forewing in male and female of normal shape for Orieosia , costa in female more arched than in male. Ground colour pale whitish-gray. In male along the costa some suffusion with black scales, more stronger basally and medially as well as at the mid-dorsum. A black dot in the basal part of the cell just above the cubital vein, and two dots obliquely placed at the end of the cell. An obscure row of submarginal dots is visible in the middle.

Hindwing of normal shape, below apex slightly excavated. Ground colour pale whitish-gray, apically in a broad area suffused with dark gray.

Male genitalia with a rather short uncus, slender, straight and with sharp apex. Tegumen triangular shaped, vinculum widely “U”-shaped, no saccus developed. Valvae rather narrow, cucullus almost rectangular with straight apex and at each corner a thorn, the costal thorn larger than the tornal thorn, dorsum of cucullus not sclerotized. Sacculus narrow and apically gradually narrowing to a curved and slender extension with a blunt apex. Aedeagus a short straight tube with an oval carinal plate. Vesica dorsally with a wide scobinated field of larger and smaller chitinous drops and laterally a group of about 20 small needle-shaped cornuti.

Female genitalia with a short and broad tube-shaped antrum which just not reaches the bursa copulatrix, it is continued by a short membranous part of the ductus bursae. Bursa copulatrix globular, with at the right side a field of numerous small spikes and some scobinated fields with tiny drops in the middle. Cervix bursae an membranous lobe at the left side where at the underside the ductus seminalis originates.

Distribution: Both known specimens have been found directly East from the Baliem Valley in the Jayawijaya Mountains (Papua, Indonesia) in the Central Mountain Range, at an altitude between 1700–2000 meter.

Etymology: The name albigrisea is derived from the whitish-gray ground colour of the wings of the species which is different from other species in the genus Orieosia .

Figures

FIGURES 1–9. Fig 1. Holocraspedon hypopolius (Rothschild, 1916), holotype Philenora arcuata Gaede ♀, MfN. Figs 2–3. Orieosia hypopolius (Rothschild, 1916): fig. 2. ♂, Warkapi, Papua Barat, Indonesia, RMNH.INS.1108805; fig. 3. ♀, Warmare Dua, Papua Barat, Indonesia. Fig. 4. O. stenoptera spec. nov., paratype ♀, Dampier Island, PNG, NHMUK010918910. Figs 5–7. O. tetrastigmata (Rothschild, 1916): fig. 5. paralectotype ♂, Dampier Island, PNG, NHMUK010918914; fig. 6. lectotype ♂, Dampier Island, PNG, BMNH(E)168880; fig. 7. ♀, Mailu, PNG, NHMUK010918911. Figs 8–9. O. albigrisea spec. nov.: fig. 8. holotype ♂, Pass Valley, Papua, Indonesia, RMNH.INS.1108865; fig. 9. paratype ♀, Walmak, Papua, Indonesia, RMNH. INS.1108866.

FIGURES 10–12. Male genitalia of Orieosia species. Fig. 10. Orieosia hypopolius (Rothschild, 1916), RMNH.INS.1108805; fig. 11. O. tetrastrigmata (Rothschild, 1916), NHMUK010918914; fig. 12. O. albigrisea spec. nov., RMNH.INS.1108865.

FIGURES 13–15. Male aedaegi of Orieosia species. Fig. 13. Orieosia hypopolius (Rothschild, 1916), RMNH.INS.1108805; fig. 14. O. tetrastrigmata (Rothschild, 1916), NHMUK010918914; fig. 15. O. albigrisea spec. nov., RMNH.INS.1108865.

FIGURES 16–19. Female genitalia of Orieosia species. Fig. 16. Orieosia hypopolius (Rothschild, 1916), RMNH.INS.1108806; fig. 17. O. stenoptera spec. nov., NHMUK010918910; fig. 18. O. tetrastigmata (Rothschild, 1916), NHMUK010918911; fig. 19. O. albigrisea spec. nov., RMNH.INS.1108866.