Philippine Bare-backed Fruit-bat Dobsonia chapmani. Original artwork from A Gap in Nature.

The Naked backed Fruit bat has wings that meet in the middle of their backs. Usually found in the Phillipeans. Typically not found in the North west. Was hunted by the guanto miners, and numbers have decreased significantly.

http://www.fieldmuseum.org/vanishing_treasures/V_BBFruitBat.htm