1. Metasomal terga black, brown or metallic....2
- Metasomal terga pale brownish yellow to dark red....31
2.Tegula ovoid, obscurely punctate....3
-Tegula enlarged with distinct posterior angle, distinctly punctate....29
3. Mesosoma coarsely sculptured (mesoscutal punctures coarse, mesepisternum coarsely rugose or reticulate, etc.) and propodeal lateral and posterior surfaces separated by strong lateral carina (Hypostomal carinae widely divergent towards mandible bases; mesoscutum laterad of parapsidal line reticulate-rugose)....4
- Mesosoma without combination above (i.e. mesoscutal punctures fine or mesepisternum rugulose or punctate or propodeal lateral and posterior surfaces incompletely separated by lateral carina)....5
4. Protrochanter with anterior surface excavated; hypostomal carinae usually strongly produced, visibly protruding in lateral view.... L.(D.) bruneri
- Protrochanter without anterior surface excavated; hypostomal carinae not strongly produced, not visibly protruding in lateral view .... L.(D.) reticulatum
5. Mesoscutal punctures laterad of parapsidal line dense, interspaces mostly less than 1.5 puncture diameters (i ≤ 1.5d)....6
- Mesoscutal punctures laterad of parapsidal line sparse, interspaces mostly greater than 1.5 puncture diameters (i ≥ 1.5-3d)....28
6. Mesoscutal punctures between parapsidal lines sparse, interspaces greater than puncture diameter (i>d)....7
- Mesoscutal punctures between parapsidal lines dense, interspaces less than puncture diameter (i<d)....23
7. T1 with distinct transverse band of appressed hairs at boundary of dorsal and declivitous surfaces, hair band separated from acarinarial fan by transverse glabrate area.... L.(D.) disparile
- T1 not as above, with, at most, scattered erect hairs at boundary of dorsal and declivitous surfaces....8
8. Head round to wide (length/width ratio < 1.02); supraclypeal area usually wider than long....9
- Head elongate (length/width ratio > 1.03); supraclypeal area longer than wide....20
9. T1 acarinarial fan incomplete, with medial opening....10
- T1 acarinarial fan complete, without medial opening....17
10. Protrochanter broad, width subequal to length; mandible with dorsal margin strongly curved, narrowing suddenly at midlength.... L.(D.) callidum
- Protrochanter narrow, width approximately half its length; mandible without dorsal margin strongly curved, narrowing gradually over total length....11
11. T3-T4 with uniquely thick, evenly spaced, longitudinally oriented hairs; (size small).... L.(D.) imitatum
- T3-T4 without thick, evenly spaced, longitudinally oriented hairs; (size variable)....12
12. Clypeus with margin distal to preapical fimbriae narrow, appearing as a continuation of the lateral margins converging below the suborbital line (i.e. clypeal margin with trapezoidal appearance)....13
- Clypeus with margin distal to preapical fimbriae wide, appearing divergent from the lateral margins converging below the suborbital line (i.e. clypeal margin with rectangular appearance) (Mesoscutum polished due to weak microsculpture; metatibia with extensive yellowish areas not limited to ends (Southern)).... L.(D.) leviense
13. T2-T4 with tomentum at least forming distinct basolateral patches; T3-T4 apical fringes present, usually dense....14
- T2-T4 with very sparse, virtually absent tomentum, at most limited to scattered basolateral hairs, T3-T4 apical fringes absentor very sparse (Head and mesosoma greenish; mesoscutal punctures and mesepisternal rugae relatively fine; tegula pale yellow).... L. (D.) alachuense
14. T1 anterior surface dull due to presence of distinct, transversely lineolate, microsculpture (Mesoscutum weakly imbricate; T3-T4 with moderately sparse tomentum and sparse apical hairs forming sparse apical fringes; lower paraocular area with relatively sparse punctures (i=1-1.5d)).... L. (D.) fattigi
- T1 anterior surface polished due to nearly complete absence of microsculpture....15
15. Metapostnotal rugae not extending much more than halfway to posterior margin; metasomal terga with metallic reflections; mesepisternum distinctly but minutely punctate.... L. (D.) zephyrum [in part]
- Metapostnotal rugae extending more than 2/3 distance to posterior margin; metasomal terga usually brown; mesepisternum at most obscurely punctate ....16
16. Mesoscutum polished posteriorly due to lack of distinct microsculpture; tegula pale; clypeus not protruding much below suborbital line.... L. (D.) trigeminum
- Mesoscutum dull posteriorly due to presence of distinct microsculpture; tegula pale to brown; clypeus protruding 2/3 below suborbital line (T2 apical impressed area with wide testaceous border).... L. (D.) admirandum
17 (9). Tibiae and femora primarily orange-yellow.... L. (D.) tarponense
- Tibiae and femora primarily brown....18
18. Metasomal terga without metallic reflections; lower paraocular without dense tomentum; gena narrower than eye (south-eastern).... L. (D.) flaveriae [in part]
- Metasomal terga with green metallic reflections; lower paraocular area with dense tomentum; gena usually wider than eye.... L. (D.) zephyrum [in part]
20 (8). Mesoscutal punctures between parapsidal lines relatively sparse, often more than 2 punctures diameter apart....21
- Mesoscutal punctures between parapsidal lines relatively dense, only separated by 1 puncture diameter medially....22
21. Mesoscutal punctures immediately mesad of parapsidal line dense, interspaces not greater than puncture diameter (i ≤ d).... L.(D.) halophitum
- Mesoscutal punctures immediately mesad of parapsidal line sparse, interspaces greater than puncture diameter (i=2-4d) (T1 acarinarial fan sparse dorsally (Southern)).... L. (D.) longifrons [in part] Photos misidentified as coreopsis
22 (20). T1 acarinarial fan small, dorsomedially without erect hairs; T2 apical impressed area dull, punctures obscure; mesoscutellum usually with submedial punctures widely spaced, interspaces greater than puncture diameter (i=1-3d).... L. (D.) creberrimum [in part]
- T1 acarinarial fan large, dorsomedially with erect hairs; T2 apical impressed area smooth, punctures distinct; mesoscutellum with submedial punctures uniformly dense, interspaces not greater than puncture diameter (i ≤ d).... L. (D.) tamiamense [in part]
23 (6). Head relatively elongate (length/width ratio = 1.00-1.10); mesepisternum rugulose....24
- Head relatively wide (length/width ratio = 0.95-0.99); mesepisternum at least obscurely punctate (Mesoscutum imbricate throughout (south-eastern)).... L. (D.) miniatulum
24. Metasomal terga metallic green; wings relatively hyaline; pterostigma pale honey-coloured.... L. (D.) floridanum
- Metasomal terga brown; wings relatively dusky; pterostigma brown....25
25. Supraclypeal area distinctly flat; T2 apical impressed areas with deep and distinct punctures; head shorter (length/width ratio =1.00-1.05)....26
- Supraclypeal area slightly convex; T2 apical impressed areas with shallow and indistinct punctures; head longer (length/width ratio = 1.05-1.09)....27
26 (25). Supraclypeal area polished due to lack of microsculpture; clypeus with apical margin laterally reddish brown.... L. (D.) batya
- Supraclypeal area dull due to imbricate microsculpture; clypeus with apical margin entirely brown.... L.(D.) raleighense
27 (25). T1 acarinarial fan small, dorsomedially without erect hairs; T2 apical impressed area dull, punctures obscure; mesoscutellum usually with submedial punctures widely spaced, interspaces greater than puncture diameter (i=1-3d).... L.(D.) creberrimum [in part]
- T1 acarinarial fan large, dorsomedially with erect hairs; T2 apical impressed area smooth, punctures distinct; mesoscutellum with submedial punctures uniformly dense, interspaces not greater than puncture diameter (i ≤ d).... L. (D.) tamiamense [in part]
28 (5). Frons punctures dense; size large, head width =1.70-182 mm; oblique carina linear, transversely directed (i.e. not U- or Vshaped) (Face relatively long (length/width ratio = 1.20-1.21); T1 acarinarial fan sparse dorsally (Southern)).... L. (D.) longifrons [in part] Photo misidentified as coreopsis
- Frons punctures sparse; size small, head width =1.06-1.49 mm; oblique carina angular, with both transversely and longitudinally directed branches (i.e. U- or V-shaped)(Mesoscutum dull due to presence of microsculpture (south-eastern, common)).... L.(D.) apopkense
29. (2). Metasoma usually with distinct metallic reflections; size larger, head width > 1.7 mm (coastal sand dune specialist).... L.(D.) marinum
- Metasoma without distinct metallic reflections; size smaller, head width < 1.5 mm ....30
30. Head and mesosoma usually blue; head relatively elongate (length/width ratio = 0.95-1.10) (south-eastern).... L.(D.) puteulanum Photos misidentified as tegularis
- Head and mesosoma green with at most bluish reflections; head relatively short (length/width ratio = 0.85-1.00).... L. (D.) lepidii
31 (1). Mesoscutum densely covered in yellowish tomentum, integument mostly or entirely obscured.... L.(D.) vierecki
- Mesoscutum not densely covered with tomentum, integument not obscured....32
32. Mesepisternum punctate-reticulate....33
- Mesepisternum impunctate (Propodeum with weak lateral carina not reaching dorsal margin).... L. (D.) stuartense
33. Metapostnotum rugose, with rugae reaching or nearly reaching posterior margin....34
- Metapostnotum smooth, at most with weak rugae limited to basal margin (Southern Florida)....35
34. Tegula elongate with posterior angle.... L. (D.) surianae
- Tegula ovoid without posterior angle.... L. (D.) nymphale
35 (33). Dull metallic; three submarginal cells; metapostnotum with basal rugae.... L. (D.) flaveriae [in part]
- Brilliant iridescent; two submarginal cells; metapostnotum without rugae.... L. (D.) eleutherense
