Key to New World Leptogenys

Based on Lattke (2011).

1

 * Basal internal mandibular margin well separated from anterior clypeal margin with head in full-face view and mandibles closed, leaving distinct gap wider than mid-mandibular width (1A) . . . . . 2


 * Basal internal margin of each mandible shuts tightly against clypeus, if gap is present it is narrow and not wider than mid-mandibular width (1B) . . . . . 29

2

 * With head in full-face view hypostomal teeth distinctly visible, either wholly or partially (Figs. 69A, 75A) . . . . . 3


 * With head in full-face view hypostomal teeth not visible at all (Figs. 76A, 84A) . . . . . 14

3

 * Petiole with an apical tooth or crest that overhangs at least part of posterior margin of node in lateral view (Figs. 68B, 73B) . . . . . 4


 * Posterior margin of node without overhanging tooth or crest (Figs. 14B, 22B) #|. . . . . 9

4

 * Petiolar node with acutely pointed apical tooth in lateral view (Fig. 75B) . . . . . 5


 * Petiolar node with apical crest or blunt tooth (Fig. 74B) . . . . . 7

5

 * Head in full-face view broad (CI < 0.90) with lateral margins distinctly diverging anteriorly (Fig. 75A) . . . . . 6


 * Head narrower (CI > 0.90) with lateral margins sub-parallel or slightly diverging anteriorly (Fig. 69A) . . . . . Leptogenys bohlsi

6

 * Mandible gradually increasing in width towards apex . . . . . Leptogenys paraense


 * Mandible of equal width throughout length . . . . . Leptogenys unistimulosa

7

 * Mandible with parallel basal and external margins, not expanding apicad . . . . . Leptogenys pubiceps (in part)


 * Mandible distinctly expanding apicad . . . . . 8

8

 * With head in full-face view mandible mostly straight except for strong basal arch; hypostomal tooth large, frequently extending behind mandible (Fig. 70A); petiolar node in dorsal view subquadrate (Fig. 70B) . . . . . Leptogenys gatu


 * Mandible evenly arched, without strong basal arch; hypostomal tooth small, barely projecting anterad of clypeus (Fig. 74A); petiolar node in dorsal view elongate (Fig. 74B) . . . . . Leptogenys punctaticeps(in part)

9

 * Body and head without standing pilosity . . . . . 10


 * Body and head with standing pilosity . . . . . 11

10

 * Mandible with parallel basal and external margins, not widening apicad (Fig. 42A); mandibular dorsum smooth and shining . . . . . Leptogenys maxillosa


 * Mandible gradually widening apicad (Fig. 77A); mandibular dorsum finely striolate . . . . . Leptogenys maya

11

 * WL > 2.5 mm; HW > 1.3 mm; body covered with abundant decumbent golden pilosity that partially obscures the underlying integument . . . . . 12


 * WL < 2.5 mm; HW < 1.3 mm; body with sparse erect pilosity never obscuring the underlying integument . . . . . 13

12

 * Head in full-face view with evenly arched mandible, with subparallel external and basal margins; body black . . . . . Leptogenys chamela


 * Mandible with an approximately straight external margin and convex basal margin, apically widening; body ferruginous . . . . . Leptogenys sonora

13

 * Third antennal segment > 2 × as long as wide; clypeus in cephalic full-face view with a prominent median laminate lobe, anterolaterally bordered by narrow lamella (Fig. 8A) . . . . . Leptogenys montuosa


 * Third antennal segment < 2 × as long as wide; clypeus with modest median lobe of thick cuticle, not anterolaterally thin and lamellate (Fig. 6A) . . . . . Leptogenys arcuata (in part)

14

 * Petiole in lateral view without dorsoposterior tooth or point (Figs. 6B, 19B, 85B) . . . . . 15


 * Petiole with a dorsoposterior tooth, blunt point or crest that usually overhangs the posterior petiolar margin (Figs. 30B, 73B) . . . . . 25

15

 * Petiolar node triangular in lateral view (Fig. 85B) . . . . . Leptogenys panops


 * Petiolar node subquadrate in lateral view (Figs. 7B, 78B) . . . . . 16

16

 * Cephalic dorsum between and posterad of eyes mostly densely sculptured=> . . . . . 17


 * Cephalic dorsum between and posterad of eyes mostly smooth and shining, at most with sparse piligerous punctulae . . . . . 21

17

 * Dorsum of head and mesosoma opaque; dorsum of mesosoma in lateral view with no standing hairs . . . . . 18


 * Dorsum of head and mesosoma with shining cuticle; dorsum of mesosoma with abundant standing hairs . . . . . 19

18

 * Mandible with subparallel basal and external margins; head broad in full-face view; ocular diameter > 1/3 the length of lateral cephalic margin . . . . . Leptogenys wheeleri


 * Mandible widens apically; head elongate in full-face view; ocular diameter 1/4 of lateral cephalic margin . . . . . Leptogenys ixta

19

 * Head in full-face view wider than long; mandible of even width from base to apex . . . . . Leptogenys donisthorpei


 * Head longer than wide, mandible wider apically than basally . . . . . 20

20

 * Median clypeal lobe with a single apical point . . . . . Leptogenys peninsularis


 * Median clypeal lobe bifurcate . . . . . Leptogenys bifida

21

 * Head in full-face view with brief anteromedian clypeal lobe, not longer than basal width (Figs. 6A, 9A) . . . . . 22


 * Head with clypeal lobe longer than basal width (Figs. 33A, 58A) . . . . . 23

22

 * Petiolar node in lateral view with continuously convex anterodorsal margin; node posterior margin weakly convex (Fig. 9B) . . . . . Leptogenys santacruzi


 * Petiolar node in lateral view with vertical anterior margin and convex dorsal margin; posterior margin vertical (Fig. 6B) . . . . . Leptogenys arcuata(in part)

23

 * Petiolar node wider than long in dorsal view with sub-parallel anterior and posterior margins; head, mesosoma and petiole with numerous punctae; clypeal lobe broadly triangular (Fig. 67A) . . . . . Leptogenys toxeres


 * Petiolar node longer than wide with a convex anterior margin and a transverse, straight posterior margin; body mostly smooth and shining with sparse minute punctulae; clypeal lobe slender (Fig. 59A) . . . . . 24

24

 * Width of third antennal segment < 1/2 its length; length of clypeal median lobe less than width of third antennal segment; WL > 1.3 mm (Fig. 59) . . . . . Leptogenys gagates


 * Width of third antennal segment > 1/2 its length; length of clypeal median lobe more than width of third antennal segment; WL < 1.3 mm (Fig. 33) . . . . . Leptogenys langi (in part)

25

 * Mandible parallel-sided in cephalic full-face view; cephalic dorsum usually smooth and shining with scattered punctulae . . . . . Leptogenys pubiceps(in part)


 * Mandible widening apicad; cephalic dorsum variable, usually punctate with striae at least on anterior region close to antennal insertions, or mostly smooth and shining . . . . . 26

26

 * Head longer than wide in full-face view; body lacking iridescence; petiolar node with crest or modest apical tooth (Figs. 29B, 74B) . . . . . 27


 * Head wider than long; body with purple-blue iridescence; petiolar node with large apical tooth (Fig. 30B) . . . . . Leptogenys ingens