Dalquestia leucopyga n. sp. is described from northeastern Tamaulipas, Mexi
co. New localities are provided for Dalquestia concho in Chihuahua, Mexico,
Dalquestia formosa in Texas, USA, and Dalquestia grasshoffi in Durango, Me
xico. The first record of D. formosa in Mexico is also provided from Nuevo
Leon. Additional biological notes are provided for D. formosa in Texas.