KEY
TO SPECIES OF Formica
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Workers
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| 1 |
1 Apical margin of clypeus more or less acute
in middle; clypeus with longitudinal carina; integument of head
and mesosoma densely tessellate, only very slightly shiny
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2 |
| -- |
Apical margin of clypeus weakly concave or distinctly notched
in middle, median carina weak or absent (Fig. 271); integument
of head and mesosoma smooth and shiny |
perpilosa (Wheeler ) |
| 2
(1) |
Metasternum lacking pilose process on each side of spinasternal
pit
|
3 |
| -- |
Metasternum with a pilose process on each side of spinasternal
pit |
5 |
| 3
(2) |
Promotum
without erect hairs or with one or two pairs of quite short
inconspicuous hairs; vertex with one or two pair of short stiff
erect hairs in ocellar area |
4 |
| |
Pronotum
with 6-8 pairs of erect long slender hairs; vertexwith 4-6 pairs
of long erect flexuous hairs in ocellear area |
aerata Francouer |
| 4(3) |
Mesometasternal
profile elongate, broadly rounded; metasternal pilosity restricted
to area caudad of spinasternal pit; propodeum, in profile, low
and elongate |
xerophila M. Smith |
| -- |
Mesometasternal profile compressed and subangulate; metasternal
pilosity partially surrounding spinasternal pit; propodeal profile
high and short, distinctly subangulate |
gnava (Buckley) |
| 5(2) |
Eye and scape with abundant short, fully erect hairs (Fig. 272) |
francoeuri
Bolton
|
| -- |
Eye and scape without standing hairs |
altipetens Wheeler |
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Females
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|
| 1 |
Lower margin of clypeus more or less acute in
middle; clypeus with longitudinal median carina; integument
of head densely tessellate, dull or slightly shiny |
2 |
| -- |
Lower margin of clypeus weakly to distinctly
notched in middle; clypeus without median carina; integument
of head smooth and shiny
|
perpilosa Wheeler |
| 2(1)
|
Metasternum without pilose process on each side of spinasternal
pit |
3 |
| -- |
Metasternum
with pilose process on each side of spinasternal pit |
5 |
| 3(2) |
Promotum
without erect hairs or with one or two pairs of quite short
inconspicuous hairs; vertex with one or two pair of short stiff
erect hairs in ocellar area |
4 |
| |
Pronotum
with 6-8 pairs of erect long slender hairs; vertex with 4-6
pairs of long erect flexuous hairs in ocellear area |
aerata Francouer |
| 4(2)
|
Eye projecting beyond side of head in frontal view; mesometa-
sternal profile low and elongate, followed by concavity; metasternal
pilosity not surrounding spinasternal pit |
xerophila M. Smith |
| -- |
Eye not projecting beyond margin of head in frontal view; meso-metasternal
profile with high, rather narrow, convexity followed by angle;
metasternal pilosity partially surrounding spinasternal pit |
gnava (Buckley) |
| 5(2) |
Eye and scape with abundant short,
fully erect hairs |
francoeuri
Bolton |
| -- |
Eye and scape without erect hairs |
altipetens
Wheeler |