Identification key to species of Pseudosympycnus (males)

(Females are not confidently associated to males at this stage and hence were not included in the present key).

1 Palpus as long as head height (Figs 26–27); tibia I compressed, white, except ventral surface yellow (Fig. 70) [Brazil: Minas Gerais, Rio de Janeiro and S„o Paulo]....................................................... P. latitibia sp. nov.

- Palpus shorter than head height, about 1/3 to 2/3 as head height (e.g., Figs 16–19); tibia I not compressed (or only thicker than tibiae II and III), mostly yellow or brown, never white (Figs 11, 40–41).......................................... 2

2 It 1 compressed and trapezoidal, with dorsal crest bearing fringe of setae increasing in size towards apex (Figs 41, 58); It 2 with dorsal projection, and apical crest bearing long setae (Figs 41, 58); tibia II with anteroventral row of erect short setae (as long as diameter of tibia) extending to IIt 1 (Fig. 69) [Dominica]................................... P. perornatus Robinson

- It 1 cylindrical or nearly so (Figs 40, 42, 44), sometimes with dorsal row of setae, but never with crest bearing fringe of setae; It 2 without dorsal projection or apical crest bearing long setae (Fig. 40); tibia II without anteroventral row of erect short setae... ................................................................................................... 3

3 It 2 with 1 anteroventrally curved seta near base; It 3 compressed with dorsal rows of slender setae (Robinson 1967, fig. 10); IIIt 3 triangular, with apical projection overlapping base of IIIt 4 and with cluster of apical setae (Robinson 1967, fig. 11) [Mexico]..................................................................................... P. bicolor Robinson

- It 2 without anteroventrally curved seta near base; It 3 cylindrical or laterally flattened, without dorsal rows of slender setae (Figs 40, 42); IIIt 3 cylindrical, without apical projection (Figs 43, 46)................................................. 4

4 It 4–5 entirely white or covered by dense whitish pubescence on anterior surface (Figs 44, 49, 53, 55, 56)................. 5

- It 4–5 entirely brown, without whitish pubescence on anterior surface (Figs 42, 47)................................... 8

5 Palpus largely transparent (Figs 28, 29); metepimeron brown (Fig. 6); tarsus I cylindrical or nearly so, It 2 with 1 long dorsal seta at apex, longer than segment (Fig. 53); femur III mostly yellow, but apical 1/5 brown (Fig. 6) [Brazil: Amazonas].............................................................................................. P. maroaga sp. nov.

- Palpus opaque (e.g., Figs 18, 19); metepimeron yellow (Fig. 2); tarsus I with flattened segments or overlapping projections (Figs 44, 49, 55, 56); femur III entirely yellow.............................................................. 6

6 It 4–5 (sometimes also It 3) laterally flattened, brown, and covered by dense whitish pubescence on anterior surface (Figs 55, 56); It 3 as long as It 1, without projection overlapping base of It 4 (Fig. 7); IIIt 3–4 with row of setae decreasing in size towards apex (Fig. 57) [Brazil: Acre, Amazonas; Panama].................................................. P. palpiger (Van Duzee)

- It 4–5 not entirely flattened as above, white, but never covered by dense whitish pubescence on anterior surface (Figs 44, 49); It 3 2–3x times shorter than It 1, with projection overlapping base of It 4 (Figs 44, 49); IIIt 3 with 4 posterior setae longer than tarsomere (Figs 46, 50)..................................................................................... 7

7 Femur I yellow, with 1 conspicuous ventral seta near basal fourth, almost as long as half of femur length (Fig. 66); femur III with 3 ventral setae near base; It 3 dark brown, with dorsal row of curved setae (Fig. 44); IIt 5 white (Fig. 45) [Peru]................................................................................................ P. araza sp. nov.

- Femur I brownish, without conspicuous, long ventral seta at basal fourth (e.g., Fig. 41); femur III with ventral row of 7–8 fine setae on basal half (Fig. 67); It 3 white, without dorsal row of curved setae (Fig. 49); IIt 5 dark brown [Brazil: Acre, Amapá and Pará].................................................................................. P. latipes (Parent)

8 Femur I brown (Fig. 11); It 2 without long dorsal bristle at apex (Fig. 64); It 3 subtriangular, projecting dorsally and overlapping base of It 4 (Fig. 64); It 4 2 times as long as It 5 and cylindrical (Fig. 64) [Colombia: Gorgona Island; Belize]................................................................................................... P. singularis (Parent)

- Femur I yellow (e.g., Fig. 7); It 2 with 1–2 long dorsal bristles at apex, as long as tarsomere (Figs 40, 47, 51); It 3 not subtriangular and not projecting dorsally over base of It 4 (Figs 40, 47); It 4 usually as long as It 5 (if It 4 longer than It 5, then It 4 laterally flattened)............................................................................................ 9

9 Metepimeron yellow; femur I without row conspicuous ventral setae (e.g., Fig. 41); It 2 with 2 dorsal bristles at apex (Figs 42, 51); It 3–4 or It 4–5 conspicuously flattened (Figs 42, 60); IIIt 3–5 with posterior and posteroventral rows of long, slightly curved setae (Figs 43, 61).................................................................................... 10

- Metepimeron light brown to brown; femur I with row of conspicuous ventral setae (Figs 40, 68); It 2 with 1 dorsal bristle at apex (Figs 47, 62); It 3–5 cylindrical; IIIt 3–5 without posterior and posteroventral rows of setae (Figs 48, 63).................. 11

10 It 3 twice length of It 4 (Fig. 42); It 3 cylindrical (Fig. 42); femur III without ventral row of long setae (Fig. 1) [Brazil: Amapá, Pará]............................................................................... P. albipalpus (Parent)

- It 3 shorter than It 4 (Fig. 60); It 3 laterally flattened (Fig. 60); femur III with ventral row of 3 setae on basal half, basal two short and curved at apex, apical one longer, twice diameter of femur at broadest point (Fig. 71) [Brazil: Acre]..................................................................................................... P. robinsoni sp. nov.

11 It 1 without row of anterior setae; It 2 with 1 sinuous bristle at apex (Fig. 62); It 3 with anterior surface mostly bare, with anterior comb of short setae at apex; distal half of femur III darkened (Fig. 10); tibiae II and III brown (Fig. 10); IIIt 4 unmodified [Brazil: Amazonas]............................................................................ P. sehnali sp. nov.

- It 1 with one anterior row of slightly curved setae, which extends to It 2; It 2 with 1 hook-like bristle at apex; It 3 with anterior surface setose and without comb of short setae at apex (Fig. 47); femur III darkened only at apex (Fig. 3); tibiae II and III dark yellow (Fig. 3); IIIt 4 slightly excavated at ventral surface (Fig. 48) [Brazil: Roraima, Pará].............. P. bickeli sp. nov.