Key to species of the subfamily Tydeinae of Peru based on adult females

1 Femur IV with two setae; aspidosoma with AA0 reticulate present; ornamentation of idiosomal dorsum subtype “Biparalorryiaincerta”; dorsal idiosomal setae very long and slightly serrated; empodial with hooks (om)................................................................................................... Melissotydeus incarum Kaźmierski

- Femur IV with one seta................................................................................ 2

2 Femur III with one seta; femur II with two setae; genu I with three setae; genu II with two setae; cheliceral stylet distinctly shorter than palptarsus; dorsal idiosomal setae not smooth (sparsely serrated); striae between ventral setae 3 a and 4 a form a “V”-pattern; solenidion ωI as long as 1/2 of width of tarsus I................................ Tydeus kochi Oudemans

- Femur III with two setae................................................................................ 3

3 Dorsal idiosomal completely reticulated; palptarsus elongate: length greater than twice its width; dorsal idiosomal setae smooth lanceolate tapering at ends; reticulate areas are divided into A(c 1), A(c 2), A(d), and A(e)..................................................................................................... Brachytydeus formosus (Cooreman)

- Dorsal idiosomal partially reticulated or granulated.......................................................... 4

4 Dorsal posterior part of opisthosoma without reticulate area A(ps 1); reticulation present in areas: A, A0(c 2), and A(h 1)(h 2); dorsal idiosomal setae unequal in length; solenidion ω I bent and very long, longer than width and height of tarsus I; empodial with hooks.......................................................... Brachytydeus incompertus (Kaźmierski)

- Dorsal posterior part of opisthosoma with reticulate area A(h 1)(h 2)(ps 1) present..................................... 5

5 Dorsal idiosomal setae serrate and sharp distally................................... Brachytydeus peruviensis (Baker)

- Dorsal idiosomal setae smooth and club-shaped distally................................................................................................... Brachytydeus juanjosei Escobar-Garcia, Ueckermann & André sp. nov.