New York Natural Heritage Program
Fawn Brown Dart
Euxoa pleuritica (Grote, 1876)
Insects

Identifying Characteristics [-]
The fawn brown dart is a mottled, copper-brown moth. The forewings consist of mottled pale copper, dark grey, and darker brown areas. The wingspan is approximately 34-38 mm. The small, round orbicular spot is pale with a dark middle; the spot is conspicuous against the dark background. Most, but not all, of the reniform spot has a pale outline. Males have dirty white or light cream hind wings that are darker along the veins and outer margin. Females have darker hind wings than males. Characteristics of male genitalia include that the right harpe is half the length of the right saccular extension, and the left saccular extension is 0.9 times shorter than the right extension. Characteristics of female genitalia include that the ovipositor lobes are rounded at the tip and have fine hairs (Anweiler 2003). A key is provided in Lafontaine (1987).

Characters Most Useful for Identification [-]
The forewing coloration and genitalia characteristics are useful for identification (Anweiler 2003).

Best Life Stage for Proper Identification [-]
The adult is the best stage for identification.

Behavior [-]
Little is known about the life history of the fawn brown dart. There is one generation each year. Larvae overwinter, and mature caterpillars are present from late spring into the summer (Anweiler 2003; Wagner et al. 2008).

Diet [-]
It is thought that the larvae feed on a variety of low-growing plants (Wagner et al. 2008).
Fawn Brown Dart Images
click to enlarge
The Best Time to See
The best time to see the fawn brown dart is during its flight season. In New York State, it has been captured flying from mid-August until early September.
J F M A M J J A S O N D
Present Reproducing
The time of year you would expect to find Fawn Brown Dart present (blue shading) and reproducing (orange shading) in New York.