Key to Stenamma westwoodii species-group queens of Western Europe and North African

This key to queens is based on: Rigato, F. 2011. Contributions to the taxonomy of West European and North African Stenamma of the westwoodii species-group. (Hymenoptera Formicidae). Memorie della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale di Milano. 37:1-56.

Queens are not known for Stenamma zanoni

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Stenamma

1

• Size larger (TL > 5.0, HL > 1.00) with longer appendages (SI and TI > 100); scape distinctly surpassing the posterior margin of the head when laid back. Scapes and tibiae with several standing hairs, besides the usual pubescence . . . . . Stenamma petiolatum

• Size smaller (usually TL ≤ 5.0 and HL ≤ 1.00) with shorter appendages (SI ≤ 100, TI < 100); scape at most just reaching the posterior margin of the head when laid back. Scapes and tibiae with appressed to decumbent pubescence only . . . . . 2

2

return to couplet #1

• Size smaller (TL < 4.0, HL ≤ 0.80); head rugulation finer and more regularly longitudinal (Fig. 49) . . . . . Stenamma striatulum

• Size larger (TL ≥ 4.0, HL > 0.80); head surface mostly areolate (e.g. Figs. 44, 46) . . . . . 3

3

return to couplet #2

• SI < 85. Colour usually darker, brown . . . . . Stenamma debile

• SI > 85, mostly ≥ 90. Colour usually paler, ferrugineous . . . . . 4

4

return to couplet #3

• Postpetiole in profile higher and stouter, about as high as long (PPL≈PPH) . . . . . 5

• Postpetiole in profile lower and more slender, distinctly longer than high (PPL>PPH) . . . . . 7

5

return to couplet #4

• PCI < 25 . . . . . Stenamma westwoodii

• PCI > 30 . . . . . 6

6

return to couplet #5

• Colour ferrugineous; SI > 90; petiolar sternite shallowly concave in profile . . . . . Stenamma africanum

• Colour brown; SI < 90; petiolar sternite fully straight in profile . . . . . Stenamma msilanum

7

return to couplet #4

• Scape reaching the posterior margin of the head when laid back (SI > 95) and with some standing hairs along its dorsal side (Fig. 48) . . . . . Stenamma siculum

• Scape not reaching the posterior margin of the head when laid back (SI < 95) and with no standing hairs along its dorsal side . . . . . Stenamma sardoum