Ottawa (Dunrobin), ON Canada

17 May 2001   11:30PM EST  (top left)
29 June 2000   1:15AM EST  (top right)
19 July 2002   11:35PM EST  (bottom left)
6 July 2002   12:19AM EST  (bottom center)
21 June 2002   12:20AM EST  (bottom right)

This species also photographed on 7 July 2000 and 17 May 2001.

Resting specimens of Nadata gibbosa often hold their wings close to the body in the shape of a peaked roof, a characteristic pose for many species of Notodontidae.  They sometimes also rest with their wings more flat as in the first photo above.  Covell (1984) refers to this moth as the White-Dotted Prominent, named for the two white spots in the reniform spot of the forewing.  I always think of this moth, however, as the "butterscotch moth" because of its yellow color, shaded to varying degrees with warm brown or orange.  The antemedial and postmedial lines are generally well defined.

The larvae of Nadata gibbosa feed on birch in particular, but other deciduous trees may also serve as host plants, including oaks, cherries, maples, plums, etc.  According to Handfield (1999), this moth has only one generation per season in its northern range, and in my general area the adult may be observed from late May to the beginning of August.

I have photographed this species in 2000 on 29 June and 7 July; in 2001 on 17 May and 6 August; in 2002 on 18, 21, 22 and 28 June, and on 1, 6 and 19 July.