Tridactylidae, Brulle, 1835

Key to the known species of Tridactylidae View in CoL found in Florida (modified from Woo 2021)

1. Larger, body length 3.8–10 mm; integument smooth; hind tarsus present ( Fig. 1A)................... 2 ( Neotridactylus View in CoL )

1’. Smaller, length 3–5 mm; integument usually somewhat hairy; hind tarsus reduced to a tiny flap concealed between the hind tibial spurs ( Fig. 1B).......................................................................... 4 ( Ellipes View in CoL )

2. Larger, length 5.5–10 mm; fully winged (occasionally with reduced hind wings but hind wings always present); swimming plates on hind tibia present ( Figs. 2A, 2B View FIGURE 2 ); color variable; usually found in sandy or muddy areas along water.. N. apicialis View in CoL

2’. Smaller, length 3.8–4.9 mm; tegmina abbreviated, hind wings absent; swimming plates absent ( Fig. 2C View FIGURE 2 ); uniformly dark colored; always found in xeric scrub habitats............................................................... 3

3. Jet black overall and integument shiny; male epiproct more shallowly incised at base and with lateral lobes less sclerotized ( Figs. 3A, 3C View FIGURE 3 ); found in scrub habitats of the Florida peninsula....................................... N. archboldi View in CoL

3’. More brownish and integument matte; male epiproct deeply incised at base and with lateral lobes heavily sclerotized ( Figs. 3B, 3D View FIGURE 3 ); restricted to coastal dune scrub of the Florida panhandle.................................. N. insularis sp. nov.

4. Fully winged (occasionally hind wings shortened); color variable but never uniformly pale ( Fig. 4A); usually found in sandy or muddy areas along water............................................................................... 5

4’. Tegmina abbreviated, hind wings absent; coloration pale white with brown/red markings ( Figs. 4B, 4C); always found in xeric scrub or sandhill habitats............................................................................... 6

5. Antennae in both sexes 10–segmented ( Fig. 5A View FIGURE 5 ). White markings on head not as below...................... E. minuta View in CoL

5’. Antennae in the male 11-segmented, in the female 12-segmented ( Fig. 5B View FIGURE 5 ). White rim of the eyes continuing forward to almost the anterior border of the forehead ( Florida populations only).......................................... E. gurneyi View in CoL

6. Head and pronotum brick red and unmarked; paraproct processes orange ( Fig. 6A View FIGURE 6 ); restricted to scrub in Manatee County......................................................................................... E. ignis sp. nov.

6’. Head and pronotum creamy white, often with black markings or even completely dark; paraproct processes white ( Figs. 6B, 6C, 6D View FIGURE 6 )................................................................................................ 7

7. Pronotum creamy and unmarked ( Fig. 6B View FIGURE 6 ); found in yellow sand scrub habitat in Polk county................ E. deyrupi View in CoL

7’. Pronotum clearly marked with black or brown ( Figs. 6C, 6D View FIGURE 6 ).................................................. 8

8. Head dark brown with pale Y-shaped marking ( Fig. 6C View FIGURE 6 )............................................... E. eisneri View in CoL

8’. Head mostly creamy, with dark brown base and two dark spurs extending towards antennal bases ( Fig. 6D View FIGURE 6 )................................................................................................. E. ceratiola sp. nov.