Key to Leptogenys of India

This worker key is based on: Bharti, H.; Wachkoo, A. A. 2013c. Two new species of the ant genus Leptogenys (Hymenoptera: Formicidae) from India, with description of a plesiomorphic ergatogyne. Asian Myrmecology 5:11-19. [[Media:Bharti & Wachkoo 2013c.pdf|PDF]]

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 * Leptogenys
 * Ants of India

1

 * Petiolar node squamiform, compressed longitudinally, its dorsal margin narrow . . . . . 2


 * Petiolar node nodiform, not compressed longitudinally, dorsum broader, sub-rectangular . . . . . 4

2
return to couplet #1
 * Clypeus armed with 3 teeth anteriorly . . . . . Leptogenys dentilobis


 * Clypeus unarmed anteriorly . . . . . 3

3
return to couplet #2
 * Head subquadrate, CI > 95; scapes shorter, SI < 85 . . . . . Leptogenys birmana 


 * Head rectangular, CI < 92; scapes longer, SI > 90 . . . . . Leptogenys processionalis

4
return to couplet #1
 * Head more-or-less striate . . . . . 5


 * Head either punctured or smooth and shining, never striate . . . . . 12

5
return to couplet #4
 * Head entirely striate . . . . . 6


 * Head without striation posterior to eyes . . . . . 9

6
return to couplet #5
 * Head uniformly longitudinally striate including the vertex; entire mesosoma regularly striate . . . . . 8


 * Head mostly longitudinally striate, vertex distinctly transversely striate; pronotum and mesonotum only rugose, with no regular striation; propodeal dorsum smooth, with a few scattered shallow punctures . . . . . 7

7
return to couplet #6
 * Head subrectangular, lateral margins parallel . . . . . Leptogenys diminuta


 * Head oval, lateral margins strongly convex . . . . . Leptogenys diminuta deceptrix

8
return to couplet #6
 * Larger species; HW > 1.55 . . . . . Leptogenys kitteli


 * Smaller species; HW < 1.55 . . . . . Leptogenys kitteli minor

9
return to couplet #5
 * Body yellowish or reddish brown; head oval . . . . . Leptogenys diminuta woodmasoni


 * Body black; head subrectangular . . . . . 10

10
return to couplet #9
 * Clypeus acutely carinate medially . . . . . 11


 * Clypeus not carinate medially . . . . . Leptogenys diminuta palliseri

11
return to couplet #10
 * Vertex smooth and shiny without any striation . . . . . Leptogenys diminuta laeviceps


 * Vertex with feeble transverse striation . . . . . Leptogenys diminuta diminutolaeviceps

12
return to couplet #4
 * First gastral segment opaque, scrobiculate . . . . . 13


 * First gastral segment mostly smooth with only widely spaced sparse piligerous punctulae . . . . . 15

13
return to couplet #12
 * Larger species; HW > 1.45 mm . . . . . Leptogenys binghamii


 * Smaller species; HW < 0.95 mm . . . . . 14

14
return to couplet #13
 * Metanotal groove distinct; petiolar node broader than long in dorsal view, DPI > 110 . . . . . Leptogenys hysterica


 * Metanotal groove obsolete; petiolar node longer than broad, DPI < 90 . . . . . Leptogenys punctiventris

15
return to couplet #12
 * Petiolar node broader than long or about as broad as long in dorsal view; petiolar dorsum broadly rounded in lateral view . . . . . 16


 * Petiolar node longer than broad in dorsal view; petiolar dorsum sloping anteriorly in lateral view . . . . . 21

16
return to couplet #15
 * Cephalic dorsum smooth and shining, at most with sparse piligerous punctulae . . . . . 17


 * Cephalic dorsum opaque or shining but distinctly punctate . . . . . 18

17
return to couplet #16
 * Pronotum smooth; second antennal segment (first funicular segment after scape) two-fifths longer than the third . . . . . Leptogenys lucidula


 * Pronotum scrobiculate; second and third antennal segments subequal . . . . . Leptogenys emiliae

18
return to couplet #16
 * Basal mandibular margin toothed . . . . . 19


 * Basal mandibular margin not toothed . . . . . 20

19
return to couplet #18
 * Head rectangular; head and mesosoma opaque, closely punctured, with a blue metallic tint . . . . . Leptogenys moelleri


 * Head subquadrate; head and mesosoma shiny, moderately punctured, with no metallic tint . . . . . Leptogenys dalyi

20
return to couplet #18
 * Gaster lighter in colour than head and mesosoma; third antennal segment distinctly longer than second segment . . . . . Leptogenys roberti


 * Gaster unicolorous with head and mesosoma; second and third antennal segment subequal . . . . . Leptogenys roberti coonoorensis

21
return to couplet #15
 * Cephalic dorsum coarsely punctate . . . . . 22


 * Cephalic dorsum smooth and shining without punctures . . . . . 24

22
return to couplet #21
 * HW > 0.95 mm; petiolar node broader than long; mesosomal dorsum densely punctate . . . . . Leptogenys jeanettei


 * HW < 0.95 mm; petiolar node longer than broad; mesosomal dorsum smooth and shiny . . . . . 23