Synonyms and other taxonomic changes
Exyra semicrocea (Guenée, 1852)
Xanthoptera semicrocea Guenée, 1852
* phylogenetic sequence #931189
wingspan 16-26 mm; average 24 mm
Adult - typical form has basal half of forewing bright yellow, distal half dark gray, divided by straight median line at right-angles to costa; some individuals have completely pale yellow forewing except for faint subterminal line; hindwing typically dark gray but may be almost white in pale forms; fringe color varies from black to almost white; top of head and collar black; top of thorax yellow.
Southeastern states: North Carolina to Florida, west to Mississippi.
Larvae feed on various pitcherplants (Sarracenia
spp.), specifically Hooded Pitcherplant
), S. psittacina, S. sledgei, S. drummondii, S. rubra,
and S. flava
. When feeding on S. flava
, it is usually replaced by Exyra ridingsii
that may occur in the area.
The Half Yellow
) has no black on top of the head or thorax.
Brou Jr., V.A., 2008. Exyra semicrocea
(Guenee) in Louisiana. Southern Lepidopterists' News
, 30: 19-20. (1)
Lafontaine, J.D. & R.W. Poole, 1991. The Moths of America North of Mexico, Fascicle 25.1
: p.76; pl.1.48-50. (2)
Riley, C.V., 1874. On the insects more particularly associated with Sarracenia variolaris
. The Canadian Entomologist
, 6(11): 207