Pale-spotted Leafwing (Anaea pithyusa)

Compare to Tropical Leafwing Guatemalan Leafwing Goatweed Leafwing

National Butterfly Center, Mission, Hidalgo Co., Tx
December 11, 2007 (Rick Nirschl)

(note two small pale dots toward center of hindwing leading edge)

National Butterfly Center, Mission, Hidalgo Co., TX
December 21, 2007 (Gil Quintanilla)

(note the variability of ground color between the different photographs)

National Butterfly Center, Mission, Hidalgo Co., TX
December 11, 2007 (D Hanson)

Bentsen RGV State Park, Mission; Hidalgo Co., TX
January 16, 2006 (R Snider)

(note large pale dots on forewing)

Cañón del Novillo, Tamaulipas, Mexico 
July 19, 2003 (R Lehman)