Key to males of Nanophareus

1. Ocularium low and widened (rendering the aspect of a divided ocularium) or low and narrowed (less than ⅓ carapace width; Fig. 2 A, C)........................................................................................... 2

- Ocularium domed and not widened (approximately ⅓ carapace width; Figs 4 A, 6A)............................... 5

2(1) Prolateral apical apophysis of coxa IV bifid from subbasal region, directed backwards, dorsal branch longer than ventral branch (Figs 2 D, 3B).................................................................................. 3

- Prolateral apical apophysis of coxa IV single (Figs 4 C, 5B) or apically bifid with two very short branches.............. 4

3(2) Ocularium low and narrowed (Fig. 2 A, C), trochanter IV with two long apical apophyses (Fig. 3 A)... N. bicornutus sp. nov.

- Ocularium low and widened, trochanter IV with one long apical apophysis.......................... N. bosqenublado

4(2) Scutal area IV undivided and prolateral apical apophysis of coxa IV apically bifid with two very short branches … N. palpalis

- Scutal area IV divided and prolateral apical apophysis of coxa IV single................................ N. bipartitus

5(1) Frontal hump on anterior margin of dorsal scutum unarmed, scutal area IV divided (Fig. 6 A), a dorsobasal and a retrobasal apophyses on femur IV (Fig. 7 A)...................................................... N. polyhastatus sp. nov.

- Frontal hump on anterior margin of dorsal scutum with enlarged, pointed median tubercles (Fig. 4 A), scutal area IV undivided and dorsally unarmed femur IV (Fig. 5 A).................................................................. 6

6(5) Scutal area IV with a pair of paramedian spines, prolateral apical apophysis of coxa IV apically bifid with two very short branches, femur IV with a retrolateral median spine................................................ N. araucanus

- Scutal area IV unarmed (Fig. 4 A), prolateral apical apophysis of coxa IV single, femur IV retrolaterally unarmed................................................................................................. N. maipu sp. nov.