Key to the Leptusa species from the eastern United States

Note. Leptusa (E.) nanula (Casey, 1893) and L. obscura Blatchley, 1910 are not included in the key. See discussion.

1. Head and pronotum with coarse setigerous punctures, distance between punctures less than their diameters (Figs. 1 g, 1j) ................................................................................................................................................................................. 2

- Head and pronotum with moderate sized setigerous punctures, distance between punctures more than their diameters (Figs. 1 b – 1f, 1h, 1i) ...................................................................................................................................................... 3

2. Antennomere 4 subquadrate (Fig. 8 a); elytra unicolored (Fig. 1 g); abdominal tergites VII – VIII with single median elongate tubercle (Figs. 1 g, 8f) ....................................................................................... L . (Dysleptusa) pusio (Casey)

- Antennomere 4 longer than wide (Fig. 11 a); posterior part of elytra paler (Fig. 1 j); abdominal tergites VII – VIII with- out single median elongate tubercle (Figs. 1 j, 11f) ...................................................... L. (Ulitusa) cribratula (Casey)

3. Elytra not more than 1.3 times longer than pronotum (Figs. 1 b, 1c, 1f) ..................................................................... 4

- Elytra at least 1.5 times longer than pronotum (Figs. 1 a, 1d, 1e, 1g – 1j)..................................................................... 8

4. Body length less than 2.5 mm; antennomere 4 subquadrate (Fig. 7 a); hind wings absent ......................................... 5

- Body length more than 2.5 mm; antennomere 4 longer than wide (Figs. 3 a, 4a); hind wings present ....................... 6

5. Body light reddish brown (Klimaszewski et al. 2004: Fig. 9); posterior margin of male abdominal tergite VIII without tubercles (Klimaszewski et al. 2004: Fig. 49); flagellum approximately 2 times longer than length of median lobe (Klimaszewski et al. 2004: Fig. 48) ............................................................. L. (Adoxopisalia) elegans Blatchley

- Body brown (Fig. 1 g); posterior margin of male abdominal tergite VIII with tubercle (Fig. 7 f); flagellum as long as 1/2 length of median lobe (Fig. 7 k) ............................................................................... L. (Dysleptusa) gimmeli n. sp.

6. Antennomere 4 transverse; hind wings absent ........................................................ L . (Dysleptusa) smetanaiella Pace

- Antennomere 4 longer than wide; hind wings present ................................................................................................ 7

7. Antennomere 5 longer than wide (Fig. 3 a); carina on each side of surface of head incomplete (fading before attaining gular suture); mesoventrite with short carina...................................... L. (Adoxopisalia) pseudosmokyiensis n. sp.

- Antennomere 5 subquadrate (Fig. 4 a); carina on each side of ventral surface of head complete (attaining gular suture); mesoventrite without carina..................................................................... L. (Adoxopisalia) smokyiensis Pace

8. Head, pronotum and elytra opaque and velutinous...................................................................................................... 9

- Head, pronotum and elytra somewhat glossy ............................................................................................................. 11

9. Antennomere 5 subquadrate (Fig. 5 a); male abdominal tergites VII – VIII without single median elongate tubercle (Fig. 5 f) ........................................................................................................................ L. (Adoxopisalia) stocksi n. sp.

- Antennomere 5 longer than wide (Fig. 2 a); male abdominal tergites VII – VIII with single median elongate tubercle (Fig. 2 f) ....................................................................................................................................................................... 10

10. Posterior margin of male abdominal tergite VIII without tubercle (Fig. 2 f); flagellum approximately twice length of median lobe (Fig. 2 j).................................................................................................... L. (Adoxopisalia) opaca Casey

- Posterior margin of male abdominal tergite VIII with tubercles (Klimaszewski et al. 2004: Fig. 45); flagellum at least 3 times longer than length of median lobe (Klimaszewski et al. 2004: Fig. 44).................................................... ................................................................................................ L. (Adoxopisalia) pseudopaca Klimaszewski & Majka

11. Abdominal tergite VI transverse (at least 1.7 times wider than long), posterior margin of abdominal tergite VIII emarginate (Figs. 6 f, 6h), male abdominal tergite VIII with single median elongate tubercle (Fig. 6 f) ................... 12

- Abdominal tergite VI subquadrate (less than 1.5 times wider than long), abdominal tergite VIII with rounded posterior margin (Figs. 9 f, 9h, 10f, 10h), male abdominal tergite VIII without median tubercle (Figs. 9 f, 10f)............... 13

12. Antennomere 4 subquadrate, 5 transverse (Fig. 6 a); carina on each side of ventral surface of head complete (attaining gular suture); posterior margin of male abdominal tergite VIII without tubercle (Fig. 6 f) ...................................... ................................................................................................................................. L. (Dysleptusa) carolinensis Pace

- Antennomere 4 longer than wide, 5 subquadrate (Klimaszewski et al. 2004: Fig. 12); carina on each side of ventral surface of head incomplete (fading before attaining gular suture); posterior margin of male abdominal tergite VIII with several tubercles (Klimaszewski et al. 2004: Fig. 22)..................................... L. (Boreoleptusa) canonica Casey

13. Mesoventrite not carinate; median lobe in dorsal view somewhat thick (Pace 1989: Fig. 639), flagellum longer than 1/2 length of median lobe (Fig. 9 k) ......................................................................... L. (Eucryptusa) brevicollis Casey

- Mesoventrite with short carina, reaching approximately 1/3 length of mesoventrite; median lobe in dorsal view slen- der (Fig. 10 l), flagellum shorter than 1/2 length of median lobe (Fig. 10 k) .................... L. (Eucryptusa) ferroi n. sp.