Key to Phytoseiidae mites (females) found on yerba mate in Ilópolis and Putinga counties, Rio Grande do Sul state, Brazil

1. Podonotal region of dorsal shield with four pairs of "lateral" setae: j3, z2, z4 and s4 ......... Amblyseiinae Muma...... 2

- Podonotal region of dorsal shield with six pairs of "lateral" setae: j3, z2, z3, z4, s4 and s6 present............................................................................................ Typhlodrominae Wainstein...... 14

2. Peritremal and exopodal shields of coxa IV strongly sclerotised and posteriorly enlarged, without j5 .................................................................................................... Phytoscutus sexpilis Muma

- Peritremal and exopodal shields of coxa IV normal; with j5 .................................................... 3

3. Peritreme short, not reaching j3......................................................... Euseius ho (De Leon)

- Peritreme long, reaching j3 .............................................................................. 4

4. Macrosetae present on legs January IV..................................................................... 6

- Macrosetae only on leg IV........................................................ Neoseiulus Hughes. ..... 5

5. Most setae of dorsal shield long (around 40-60µm) often exceeding the base of the next setae.... Neoseiulus fallacis (Garman)

- Most setae short not reaching the base of the next setae.................................. Neoseiulus tunus (De Leon)

6. Setae s4, Z4 and Z5 long measuring, respectively, 88, 102 and 188 µm............................................ 7

- Setae s4, Z4 and Z5 shorter............................................................................. 11

7. All shields more strongly sclerotised and mostly reticulate; no erect setae on St I............. Iphiseiodes De Leon. ..... 8

- All shields lightly sclerotised and slightly reticulated or smooth; erect setae on St I............ Amblyseius Berlese. ..... 9

8. Three pairs of setae on ventrianal shield; two pairs of metapodal plates, movable digit with three tooth..................................................................................... Iphiseiodes saopaulus Denmark and Muma

- Four setae on ventrianal shield; one pair of metapodal plate, one tooth on movable digit..... Iphiseiodes moraesi Ferla and Silva

9. Ventrianal shield vase-shaped, with constriction after JV3.............................. Amblyseius herbicolus (Chant)

- Ventrianal shield never vase-shaped...................................................................... 10

10. Ratio seta Z5: Z4 (2.4> 1.0)................................................... Amblyseius operculatus De Leon

- Ratio seta Z5: Z4 (1.8 <1.0)............................... Amblyseius neochiapensis Lofego, Moraes and McMurtry

11. Spermatheca with major duct swollen, with constriction basal on cervix, bladder-like or flaring distally........................................................................................... Typhlodromips De Leon. ..... 12

- Spermatheca without major duct, without constriction basal on cervix, with atrium nodular.......................... 13

12. Macrosetae on leg IV not knobbed, ventrianal dorsal shield smooth........................ Typhlodromips pallinii n. sp.

- Macrosetae on leg IV knobbed, ventrianal shield slightly reticulate........... Typhlodromips japi Lofego, Demite & Feres

13. Ratio seta s4: Z1> 3.0: 1.0................................................... Amblydromalus manihoti (Moraes)

- Ratio seta s4: Z1 <3.0: 1.0...................................................... Typhlodromalus aripo De Leon

14. Legs without macrosetae; setae along margins of dorsal shield long and slightly serrated and St3 on platelets.......................................................................................... Typhlodromina tropica (Chant)

- Legs with or without macrosetae; only setae Z4 and Z5 serrated, St3 on the sternal shield............................ 16

15. Macrosetae Sge IV, Sti IV and St IV knobbed.................... Typhloseiopsis dorsoreticulatus Lofego, Demite & Feres

- Leg IV with 0 to 3 macrosetae not knobbed........................... Metaseiulus camelliae (Chant & Yoshida-Shaul)