Key to species of Ambaeolothrips

1. Fore wing with two distinct transverse dark bands, apex of clavus pale (Fig. 17); metanotum without a pair of campaniform sensilla (Fig. 21).............................................................................. romanruizi

-. Fore wing with only one transverse dark band, clavus uniformly dark (Figs 16, 18); metanotum with paired campaniform sensilla medially (Figs 22, 23)............................................................................. 2

2. Fore wing with dark bands along anterior and posterior margins toward wing apex, deeply shaded between costa and first vein (Fig. 18), posterior margin dark opposite apex of clavus; female with antennal segment II dark, also abdominal segments uniformly dark brown (Fig. 20)................................................................ pampeanus sp. n.

-. Fore wing without long dark bands, not deeply shaded between first vein and costa (Fig. 16), posterior margin pale opposite apex of clavus; male with antennal segment II pale (Fig. 6), also abdominal segments III–VIII pale in contrast to dark segments I–II and IX–X (Fig. 15)....................................................................... microstriatus