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Key to Species and Genera of Protoschizomidaela. Male flagellum without ventrolateral lobes (Fig. 97); female flagellumwithout segments or articles (Fig. 102) (Tamaulipas)A. pateilb. Male flagellum with ventrolateral lobes; female flagellum segmented 22a. Anterior process of propeltidium with one seta; male flagellum notdistally enlarged Agastoschizomus 32b. Anterior process of propeltidium with two setae (Fig. Ib); maleflagellum distally enlarged Protoschizomus 53a. Metapeltidium divided (San Luis PotosI) A. lucifer3b. Metapeltidium undivided 44a. Femur IV 4.8 times longer than wide; abdominal tergite I with onepairs oflarge posterior setae (San Luis Potosl}4b. Femur IV 6.0 times longer than wide; abdominal tergite I withoutlarge posterior setae (Hidalgo)A. huitzmolotitlensisA. stygius5a. Propeltidium with three or four pairs dorsal setae (Fig. lb); malestemites IV-VIII with scattered or two irregular rows of setae P. pachypalpus group 65b. Propeltidium with two pairs dorsal setae; male sternites IV-VIII withtwo regular rows ofsetae 86a. Male flagellum broadly joined at base (Fig. 52), vm4 seta present(Fig. 27); sperrnathecae robust (Fig. 57) (Colima)P. occidentalis6b. Male flagellum less broadly joined at base, vm4 seta missing;sperrnathecae long and slender. 77a. Propeltidium with three pairs setae; male flagellum 1.7 times as wideas long, strongly constricted basally (Fig. 39) (Tamaulipas)7b. Propeltidium with four pairs setae; male flagellum 2.0 times as wideas long, not strongly constricted basally (Fig. 46) (San Luis Potosl}P. pachypalpusP. rowlandi8a. Female flagellum with dm4 seta missing; pedipalp trochanter slightlyproduced P. sprousei group 98b. Female flagellum with dm4 seta present; pedipalp trochanter notproduced 109a. Female flagellum with segment/article V present (Fig. 9); sperrnathecaelong, slender, not enlarged apically (Fig. 64) (Cueva del Tecolote, Tamaulipas)...... ..P. sprouse;9b. Female flagellum with segment/article V absent (Fig. 73); sperrnathecaeshort, enlarged apically (Fig. 76) (Cueva X, Tamaulipas)P. purificacionlOa. Female flagellum with all setae present (Figs. 10-11), segment/articleV missing (Fig. 10); femur IV 4.2 times as long as deep (San Luis Potosl}lOb. Female flagellum with drn2 seta missing (Fig. 14); segment/article Vpresent (Fig. 14); femur IV 3.7 times as long as deep (Cuevadel Borrego, Tamaulipas)P. gertschiP. treacyae46