Which specific mountain system on Oahu is mentioned as a confirmed historical and current location for the endangered species *Hylaeus anthracinus*?
Answer
The Waianae Mountains
The distribution map for several endangered Hawaiian yellow-faced bees details precise ecological niches across Oahu. For *Hylaeus anthracinus*, its confirmed historical and present-day locations are spread across distinct regions of the island that exhibit the required dry forest and shrubland conditions. Among these confirmed areas are the Waianae Mountains, which host unique microclimates conducive to the bee's survival. Additionally, this species is recorded in the Ko'olau Mountains and within the general Honolulu area, demonstrating that its range encompasses varied zones across the island, though the Waianae range remains a critical component of its known habitat.

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