Synonyms and other taxonomic changes
Exaeretia gracilis (Walsingham, 1889)
Walsingham, 1889 (1)
Phylogenetic sequence #420116
Explanation of Names
Specific epithet is Latin meaning "slim" for the "rather narrow" forewings. (1)
It is unclear where the name "Ambrosia Seed Moth" came from, but it is inappropriate since this species is a leafminer rather than a seed feeder.
Forewing length 6.7-9 mm. (2)
Adult - distinctive, pale yellow tan with base and prothorax dark brown. (2)
Larva - dark, almost black. (2)
North Dakota to Texas and west to California. (2)
Several broods in southern California with adults recorded nearly year round. May to June in northern areas of the range.
Larvae mine the leaves of:
(western ragweed) USDA Plant profile (3)
(Oregon gumweed) USDA Plant profile (2)
(telegraphweed) USDA Plant profile (2)
Powell, J.A. & P.A. 2009. Opler, Moths of Western North America. Pl. 5.3m; p. 66 (2)
Hodges, Ronald W. (ed.), 1983; Check List of the Lepidoptera of America North of Mexico. (4)
Hodges, R. W., 1974. MONA Fascicle 6.2, p. 45; pl. 3.11 (out of print)
Walsingham. T. de Grey. 1889. Steps towards a revision of Chambers' index, with notes and descriptions of new species. Insect Life
1(8): 257 (1)
Moth Photographers Group
- species page with photograph of pinned adult.
Pinned Specimen and Info
at Moths of North Dakota.
Moths of Oklahoma (PDF)
- listed for Oklahoma.
Moths of Iowa
- listed for Iowa.