Setiostoma xanthobasis Zeller 1876

Setiostoma xanthobasis Zeller, 1875:325

Alar expanse 12–14 mm.

Eye index .65 male, .62 female.

Antenna dark brown dorsally, annulated with white from base to midpoint; white ventrally in female, dark brown in male; sensory hairs of male 4–5 × diameter of shaft to apical three fourths; those of female about 0.5 ×.

Head, labial palpus, maxillary palpus lemon yellow. Base of probosis white. Thorax dark brown dorsally except tegulae, which are lemon yellow. Legs dark brown; foreleg with coxa entirely white, tarsi ringed with white; midleg with tibial spurs white, three white tarsal rings; hindleg with tibial spurs white, two white tibial rings, three white tarsal rings. Abdomen dark brown with patches of white laterally. Forewing dark brown, with lemon yellow triangular area, continuous with yellow tegula, occupying basal third except short costal lenticular spot and longer, narrower spot along posterior wing margin, both spots concolorous with ground color. Apical two thirds of forewing with inconspicuous area of white scales near midlength of costa and similar, smaller area slightly more distad; broad transverse band, parallel to distal margin of yellow area, small group of scales behind more basal white area, short curved band extending caudolaterad from more distal white area, submarginal longer straight band parallel to outer wing margin, iridescent blue violet. Cilia concolorous with ground color. Hindwing dark brown with white patch on basal half of anterior margin; cilia brown, edged in white.

MALE GENITALIA (WDD 22659–H).—Uncus slightly recurved, pointed; gnathos a simple band; harpe simple, costa near apex slightly expanded, bearing palmate, multilobed setae on margin; vinculum V-shaped; anellus small, with two large upright lateral lobes; aedeagus apically acute, vesica armed with an apical cluster of small, heavy cornuti and a single large posterior cornutus.

FEMALE GENITALIA (WDD 4759–C).—Ovipositor elongate, anterior and posterior apophyses approximately equal in length, straight; lamellae antevaginalis, postvaginalis membranous; ostium broad, ostium bursae cuplike; ductus bursae short, membranous; corpus bursae membranous, transition from ductus bursae gradual, signum a large, dentate, ovoid plate.

TYPE.—In the Museum of Comparative Zoology, Harvard University.

TYPE LOCALITY.—Texas.

HOST PLANT.—Quercus sp., Quercus nigra, Quercus stellata.

DISTRIBUTION.—This species is presently known to occur along the Atlantic Coastal Plain from southeastern Massachusetts south to central Florida and eastern Texas, and north in the Mississippi Valley to Missouri and Illinois.

ADULT RECORDS.—MASSACHUSETTS: Martha’s Vineyard (no date). NEW JERSEY: Lacy (July). MARYLAND: Annapolis (August). DISTRICT OF COLUMBIA: Washington (July). NORTH CAROLINA: Southern Pines (August). GEORGIA: Spring Creek (July); Terrell County (June). FLORIDA: Enterprise (April); Lakeland (May); Tall Timbers Research Station, Leon County (September); Myrtle Grove (April, August); Chokoloshee (no date); Jacksonville (April). ILLINOIS: No locality. MISSOURI: No locality (May); Kirkwood (May). ARKANSAS: Devil’s Den State Park, Washington County (July); Washington County (July). TEXAS: Houston (August).