Key to the species of Rheumatobates occurring in Colombia

1. Male hind legs unmodified (Figs. 8 a, 10a and 11a)........................................................... 2

- Male hind legs modified (presence of protuberances, tufts of setae, chitinous structures, etc.) (Figs. 3 a–e)................ 5

2. Male antennae modified (segments curved, widened) (Figs. 2 a–g)............................................... 3

- Male antennae unmodified (Fig. 8 a)....................................................................... 4

3. Male antennal segment I with base as wide as apex (Fig. 2 f). Male fore femur thickened at base, with a laterobasal projection and a row of long setae at inner margin. Male fore femur without row of spines (Fig. 10 a). Male hind femur not extended anteriorly (Fig. 10 a). Male sternites V, VI and VII concave, with tufts of long setae, which are directed to sternite III (Fig. 10 a). Female with tergite VIII subquadrate, with several setae (Fig. 10 b); and gonocoxae not directed upward................................................................................................ R. carvalhoi Drake & Harris

- Male antennal segment I narrow at basal 1/3, thickened towards apex, with a distal dilated projection (Fig. 2 g). Male fore femur without a laterobasal projection, with a row of 10 to 11 irregular spines at inner ventrolateral margin (Fig. 11 a). Male hind femur anteriorly extended into a chitinous structure that reaches the apical region of the coxa (Fig. 11 a). Male sternites V, VI and VII no concave, without distinct tufts of setae. Female with tergite VIII subtriangular, with two long setae on each side (Fig. 11 b); and gonocoxae slightly directed upward............................ R. probolicornis Polhemus & Manzano

4. Male fore femur with a row of setae at inner margin, without row of spines. Female with connexiva rounded at apex (Fig. 9 a); tergite VIII subpentagonal (Fig. 9 a); gonocoxae not directed upward..................... R. minutus minutus Hungerford

-. Male fore femur without row of setae at inner margin, with a row of spines at lateroventral inner margin, doubled at basal half (Fig. 8 a). Female with connexiva short and subquadrate at apex; tergite VIII subrectangular, longer than wide (Fig. 8 b); gonocoxae slightly directed upward........................................................ R. clanis Drake & Harris

5. Male fore legs modified (presence of apical indentations) (Fig. 1 a)................................. R. plumipes n.sp.

- Male fore legs unmodified (Figs. 4 a, 5a, 6a, 7a).............................................................. 6

6. Male hind trochanter thickened from base to apex. Male hind femur with a pedunculated T-shaped structure at inner margin (Figs. 3 a and b)....................................................................................... 7

- Hind trochanter of male thickened at base, and reduced towards apex. Male hind femur without T-shaped structure (Figs. 3 c and d)............................................................................................... 8

7. Male hind trochanter in dorsal view with two teeth-like projections (Fig. 3 c). Antennal segment I with a row of three to four long stout setae at mediolateral region (Fig. 2 c). Antennal segment III with a wide medioventral projection and an indentation occupying the distal half (Fig. 2 c). Female connexiva acute at apex; female tergite VIII subrectangular, longer than wide (Fig. 5 b)................................................................................. R. bergrothi Meinert

- Male hind trochanter without such projections (Fig. 3 b). Antennal segment I with a group of setae at ventral margin (Fig. 2 b). Antennal segment III with a small projection at medioventral margin (Fig. 2 b). Female connexiva rounded at apex, tergite VIII subtriangular (Fig. 4 b).................................................................... R. imitator (Uhler)

8. Male antennal segment IV with a row of four long stout setae, followed by four shorter erect setae (Fig. 2 e). Male fore femur with four long setae at basal region and three long setae at apical region (Fig. 7 a). Base of hind femur of male subquadrate (Fig. 3 e). Female antennal segment IV almost twice as long as III; tergite VIII subtriangular (Fig. 7 b)................................................................................................... R. crassifemur esakii Schroeder

- Male antennal segment IV with all setae more or less of the same size (Fig. 2 d). Male fore femur with a row of short setae at inner margin (Fig. 6 a). Base of hind femur of male rounded (Fig. 3 d). Female antennal segment III shorter; tergite VIII subquadrate (Fig. 6 b)........................................................... R. crassifemur crassifemur Esaki