Key to Brazilian species of Matta

1. Eyes absent (Fig. 20A, 21C)............................................................... M. humrrum sp. n.

- Eyes present (Fig. 1A, 7A).............................................................................. 2

2. Normal eyes (Fig. 1A, D)............................................................................... 3

- Vestigial eyes (Fig. Fig. 7A, D)........................................................................... 5

3. Carapace less elongated in the posterior region (Fig. 2B).......................................... M. zuiuda sp. n.

- Carapace most elongated in the posterior region (Lehtinen, 1981, fig. 297)........................................ 4

4. Male: rugose ventral face of the palpal tibiae, long embolus; female with triangular DF (Brescovit, 2005, figs 18-19, 21).......................................................................................... M. angelomachadoi

- Male: smooth ventral face of the palpal tibiae, shorter embolus; female with conical DF (Crosby, 1934, fig. 6; Lehtinen, 1981, fig. 310.................................................................................. M. hambletoni

5. Separate vestigial eyes (Fig. 7A)......................................................................... 6

- Together vestigial eyes (Fig. 23A, C)...................................................................... 7

6. Male: retrolateral projection on leg I with four conspicuous setae in large sockets (Fig. 7E ̅F); female with oval dorsal fold of the uterus externus (Fig. 6F)............................................................... M. pititinha sp. n.

- Male: retrolateral projection on leg I on a raised base, with four conspicuous setae in elevated sockets (Fig 12A ̅D); female with mushroom shape dorsal fold of the uterus externus (Fig. 10F)................................ M. humhum sp. n.

7. Body slender and long legs in males and females (Fig. 15A, D)................................... M. cambito sp. n.

- Body truncated and shorter legs in males and females (Fig. 16A, D).............................................. 8

8. Male palp with laminar projection having enlarged base, forming a side flap (Fig. 24C ̅E); female with diamond piriform dor- sal fold of the uterus externus (Fig. 22F)...................................................... M. nuusga sp. n.

- Male palp without laminar projection (Fig. 28A ̅H); female with sclerotized base of the dorsal fold of the uterus externus (Fig. 26F)..................................................................................... M. teteia sp. n.