Tarache flavipennis Grote
Tarache flavipennis Grote, 1873, Bull. Buffalo Soc. Nat. Sci., 1:153.
Diagnosis: The forewing of Tarache flavipennis
is primarily dark brown, although the basal area (particularly along the
inner margin) is mottled with pearly gray. A white rectangular band descends
from the costa and encloses the small, black orbicular with the reniform
pressed up against the far side. The forewing also has a small, white
streak from the costa near the subterminal line. The lower two-thirds
of the subterminal line is white and irregular. The hindwing is yellow-orange
with the discal dot distinct and linear. The undersides of both the forewing
and the hindwing are both suffused with yellow-orange. The female is similar
to the male. Forewing expanse from base to apex in one selected individual 11 mm.
Distribution: (Based only on specimens in the USNM). Tarache flavipennis is a species of central and northern California. A single specimen of flavipennis from Arkansas must either be mislabeled or is a stray. Adults fly in June and July
Identification Quality: Excellent
Distribution map based on specimens in the USNM
Tarache lagunae is most likely to be confused with Tarache flavipennis. The two species are most easily separated by geographical area. Tarache lagunae is known only from southern California, particularly San Diego County. In contrast flavipennis occurs in central and northern California, extending northward into Oregon. The discal dot of the hindwing is small to absent in lagunae, but usually distinct in flavipennis. The white patch on the costa of the forewing enclosing the orbicular tends to be (but is not always) larger and broader in flavipennis than in lagunae. The vesica of the male genitalia contains 6 large spines in lagunae, but only 5 in flavipennis.