Chelostoma (Chelostoma) stefanii Nobile, 1995

Chelostoma stefanii Nobile, 1995: 2 . Type material: Holotype ♀, “ M. Nebrodi, C. da Pomarazzo, 1550m ” (Sicily), type depository unknown.

Chelostoma (Chelostoma) siciliae Müller, 2012: 32 . Type material: Holotype ♀, “Madonie mountains, Collesano env., 1–600m ” (Sicily), Entomological Collection of ETH Zurich. New synonymy.

New records. ITALY: Sicily: Monti Nebrodi, 8 km NW Cesaro, 1300 m, 7.6.1999, 1♂ (leg. B. Merz) ; Monti Nebrodi, 15 km NW Cesaro, 1400 m, 12.6.2012, 1♀ (leg. J.Halada) ; San Fratello, 37°55.849′N / 14°38.297′E, 1469 m, 1.5.2013, 1♀ (leg. A. Haris) .

Distribution. Known so far only from the Nebrodi and Madonie mountains in northern Sicily.

Pollen hosts. Polylectic; pollen sources known so far include Ranunculus ( Ranunculaceae) and Helianthemum ( Cistaceae) (Müller 2012).

Nesting biology. Unknown.