Macrosaccus robiniella

Adult forewing pattern complex, costal half mostly light orange brown crossed by 4 equally spaced white costal strigulae, each bordered basally by black to dark grey and distally by light grey scales; a fifth minute white strigula sometimes arising from black apical spot before apex. Basal third and dorsal half of forewing usually darker, mostly black to sometimes pale golden grey between strigulae; slender white streak from base of wing usually indistinct or absent; a greyish oblique strigula often evident near base connecting with a larger more distinct greyish strigula from dorsal margin; apex with a large black apical spot. Antenna mostly dark fuscous dorsally for most its length, with dark area narrowing to a more slender dark streak toward basal 1/4–1/3. Midleg with 2 oblique bands of white dorsally over tibia; hindleg mostly white with much of tibia pale fuscous dorsally, and with 3 broad pale fuscous annuli dorsally over tarsomeres. Abdomen dark fuscous dorsally and white ventrally with greyish suffusion on anterior portion of segments 2–7 laterally and sometimes ventrally on A8. Male genitalia: saccus slender elongate rod ~1.2× length of valva; aedeagus very long and uniformly slender ~2.1× length of valva. Female genitalia: ductus bursae long and slender nearly half length of elongate corpus bursae; accessory bursae ~2/3 length of corpus bursae arising from anterior 1/3 of ductus bursae.

Literature