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Genus Labidus Jurine

(Ecitoninae)

      Labidus Jurine 1807:282.    Type-species: (Labidus latreillei Jurine 1807) =Formica coeca (Latreille, 1802a); monobasic.

       Nycteresia
Roger, 1861b:21. Type-species: Formica coeca Latreille, 1802a; monobasic.

       Pseudodichthadia
E. Andre, 1886:838. Type-species: (Pseudodichthadia incerta E. Andre, 1886) = Formica coeca Latreille, 1802a; monobasic.

       This is a small genus of nocturnal foraging army ants that ranges from Oklahoma, Texas, and Louisiana in the United States, south to northern Argentina. The most commonly encountered species is L. coecus, with a range that blankets those of all the other species.

Included names

L. auropubens (Santschi, 1920) (Map 3)
 = L. praedator subsp. auropubens Santschi, 1920


L. coecus (Latreille, 1802a). United States to Argentina , Trinidad (Map 4) Plate 22


= Formica omnivora Olivier, 1791
= L. latreillii Jurine, 1807
= L. jurini Shuckard, 1840a
= Mutilla (Labidus) fulvescens Blanchard, 1849
= L. saji Haldeman, 1852
= L. atriceps .F Smith, 1859b
= L. pilosus F. Smith, 1859b PREOCCUPIED
= L. panzeri F. Smith, 1859b
= Eciton vastator F. Smith, 1860a
= Eciton erratica F. Smith, 1860a
= Myrmica rubra Buckley, 1867
= Eciton Smithii Dalla Torre, 1892 new name for L. pilosus F. Smith
= Eciton coecum var. biloba Emery, 1901c
= Eciton nigrita Emery, 1901c
= Eciton coecum subsp. Kulowi Forel, 1901c
= Eciton selysi Forel, 1904b
= Eciton grassator Forel, 1911a
= Eciton (Labidus) coecum servillei var. hostilis Santschi, 1920c
= Eciton (Labidus) coecum var. opacifrons Wheeler, 1921b
= Eciton (Labidus) coecum var. elsbethae Forel, 1922
= Eciton (Labidus) serpentis Weber, l938a


L. curvipes (Emery, 1900) . Costa Rica to Ecuador. (Map 3)


L. mars Forel, 1912 (Map 5 )


L. nero (Santschi,1930) (Map 5)
= L. nero subsp. denticulatus Borgmeier, 1955 NEW SYNONOMY


L. truncatidens (Santschi, 1920). (Map 7)


L. praedator (F. Smith, 1858) Mexico to Argentina. (Map 6) Plate 26


= Formica omnivora Kollar, in Pohl, 1832; not F. omnivora Olivier, 1791
= Eciton tepeguas Norton, 1868a
= Eciton tepaguas var. ferruginea Norton, 1868a
= Eciton westwoodi Emery, 1900
= Eciton (Labidus) praedator var. guianense Wheeler, l921b 
= Eciton (Labidus) praedator subsp. sedulus Menozzi, 1926 NEW SYNONYMY


L. spininodis (Emery, 1890a). Costa Rica to Brazil and Peru. (Map 7)


KEY TO THE SPECIES

 

Workers
1 Petiole without anteroventral tooth praedator
-- Petiole with anteroventral tooth 2
2 (1) Basal surface of propodeum broader than long, and only slightly lower than mesonotum
mars
-- Basal surface of propodeum longer than broad, and strongly depressed below the mesonotum
3
3(2) Length of scape less than five times it's apical width, and about one half head length (Largest major workers only); nodes of petiole and postpetiole about same length (dorsal view) ;color variable reddish to dark brown. integuments smooth and shiny, short appressed pubesence sparse.

coecus
-- Length of scape more than five times it's apical width, and at least two thirds head length (Largest major workers only); node of petiole slightly longer than node of postpetiole (dorsal view); color uniformly brown; densely clothed with short appressed pubesence; integument dull

spininodis
 


MALES
 
1 Dorsal projection of sagitta broadly rectangular, about as broad as length of ventral projection; sagitta of nero denticulatus with large teeth on posterior border of dorsal projection (fig. ); posterior border of expanded apex of volsella more or less evenly serrated (fig. )



nero
-- Dorsal projection of sagitta rounded or distinctly narrower than length of ventral projection with irregular teeth
2
2(1)

Anterior border of clypeus concave in the middle (fig. ); volsella somewhat hook shaped with posterior projection   (fig. )



coecus
-- Anterior border of clypeus straight or convex in the middle; volsella not hook shaped
3
3(2) Distance from lateral ocellus to compound eye at least 1.5 times diameter of lateral ocellus
4
-- Distance from lateral ocellus to compound eye about equal to or less than the diameter of lateral ocellus
5
4(3) Mandible gradually tapered to a pointed apex (Fig. ); anterior border of clypeus strongly convex
curvipes
-- Apex of mandible truncate (Fig. ); anterior border of clypeus slightly convex
truncatidens
5(3) Apical one third of stipes blade shaped and abruptly narrowed (fig. ); mandible gradually tapering to a pointed tip; anterior border of clypeus broadly and slightly convex

auropubens
-- Apex of stipes bluntly rounded (fig. ); mandible abruptly narrowed near apex; median portion of anterior border of clypeus almost straight

praedator

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Date of this version 14 August 2005
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All text and images contained on this web site are copyright © 2000 - 2005
by Gordon C. & Roy R. Snelling