We describe for the first time the characteristics of the nests and eggs of the Green-backed Sparrow (Arremonops chloronotus) and the Grey-throated Chat (Granatellus sallaei) with additional notes on breeding behavior. These two species are endemic to southern Mexico, Belize, and the northern portion of Guatemala where they are fairly common. Three nests of the Green-backed Sparrow were found on the ground, two in young successional and one in undisturbed subperennial forest. Each nest was domed with two unspotted white eggs. Two cup-shaped nests of the Grey-throated Chat were found in the understory of young successional forest, and the two eggs found in one of them were white with a pinkish wash.