The male Lachesilla sulcata García Aldrete is here described and illustrated; male specimens are known from the states of Nuevo Leon and Hidalgo in Mexico, and from Florida, Georgia, and Mississippi in the U. S. A. Lachesilla patzunensis Garcia Aldrete is removed from the species assemblage formerly known as species group patzunensis; the rest of the species, together with L. sclera New and Thornton, transferred from species group corona, now constitute species group sclera, close to group corona. Diagnoses of species groups sclera and patzunensis are included, as well as a key to the species in group sclera.