Genus Mexentypesa Raven, 1987 .

Type species. Mexentypesa chiapas, Raven, 1987: 358, f. 1–9 (Dmf). Type specimen non vidi. The authors considered that the information in the original description is enough to make a comparison between the type species and M. hidalguensis sp. nov.

Diagnosis. Updated from Raven (1987). Males have a retrolateral-ventral small finger-shaped projection on metatarsus I (Figs 19, 20, 39–41). Tibia I with only one massive retrolateral spine. Biserially dentated paired claws. Eyes on a distinctly raised tubercle, AER sightly procurved, PER sightly recurved. Labium without cuspules. Females with two seminal receptacles.

General description. Updated from Raven (1987). Small sized spiders. Carapace longer than wide, flat, with smooth surface, setose, pyriform-shaped, light or dark brown coloration (Figs 1, 2). Foveal groove horizontal, slightly deep (Fig. 2). Male coloration in most specimens is light to dark brown. Abdominal coloration light brown, with dark brown stains in males (Figs 1, 28); females lack stains on abdomen and have dark brown coloration (Fig. 22). Sternum longer than wide, nonagonal in shape (Figs 4, 31), with sigilla near the labium or without sigilla. Endites long and setose, males with an apical-prolateral conspicuous conical apophysis, but absent on females. Endites with cuspules on the apical-retrolateral face (Figs 7, arrow in 31). Labium wider than long (Figs 4, 7, 31). Chelicerae light or dark brown. Rastellum consists of numerous long setae or stout spines. Chelicerae promargin with row of medium teeth and very long setae. Many spines on tibiae I and metatarsi III and IV (Figs 13–18, 37, 38, 42). Claw tufts on all legs. Spinnerets beige or dark brown. PMS small and rounded apically, single segment, with spigots. PLS long and digitiform apically, all 3 segments with spigots: basal segment length> median segment> distal segment. Legs III and IV with numerous spines (Figs 18, 42). Females have two seminal receptacles with two lobes (Figs 25, 44). Palpal cymbium with dorsal spines (Figs 10–12, 32–36). Massive ventral and prolateral spines on the palpal tibiae (Figs 8, 9, 32). Palpal bulbs piriform (Figs 10–12, 32–34, 36).

Composition. Two species: Mexentypesa chiapas Raven, 1987 (Chiapas and Oaxaca, Mexico), and Mexentypesa hidalguensis sp. nov. (Hidalgo, Mexico).