Myrmicinae: key to genera, couplet 6

Myrmicinae: key to genera couplet 6
Key: modified from Hölldobler & Wilson (1990), Bolton (1994)

Taxa remaining

Tribe Formicoxenini

Formicoxenus*#
Harpagoxenus#
Leptothorax
Protomognathus#

Figures 68,69. Myrmicinae: Protomognathus americanus

Figures 70,71. Myrmicinae: Leptothorax ambiguus

6.Antennal scrobes present (Figs. 68,69: 2b 3a); mandible with 0 or 4 teeth; anterior margin of clypeus concave medially. (dulotic on Leptothorax spp.)(none in TW)
...7.

Antennal scrobes absent (Figs. 70,71: 2b 3a); mandible with 5 or 6 teeth; anterior margin of clypeus convex to indented medially.(none in TW)
...8.

7.Mandible with 4 teeth; median impression of anterior clypeal margin broad and very shallow. (very rare, or with very patchy distribution, one species, P. americanus, collected in Illinois, Indiana, Kansas, Michigan, Minnesota) (2b 3a)
...Protomognathus#.

Mandible with no teeth; median impression of anterior clypeal margin narrow and deep. (very rare, one species, H. canadensis, collected in Michigan and northeast Minnesota) (2b 3a 1a 4a)
...Harpagoxenus#.

Subfamily: Genus: 7a

Myrmicinae Protomognathus P. americanus (Emery) =Harpagoxenus americanus MN

Subfamily: Genus: 7b

Myrmicinae Harpagoxenus H. canadensis M.R. Smith MN, Cedar creek

8.Eyes with short, erect hairs projecting between the ommatidia.(commensals of Myrmica, Manica, and Formica, very rare, collected in Michigan, North Dakota, and South Dakota) (2b 3a)
...Formicoxenus*#

Eyes without erect hairs projecting between the ommatidia.
(collected in all Midwestern states) (2b 3a)
...Leptothorax (in part: ant=11)

Subfamily: Genus: 8a F. hirticornis (Emery)

Myrmicinae Formicoxenus F. provancheri (Emery)

Genus Leptothorax

Subfamily: Genus: 8b

Myrmicinae Leptothorax many: ant=11, eye w/o hairs

L. ambiguus Emery

L. texanus davisi

Notes: social parasitic ant, prefer cavities, kill host adult, primitive, with ectoparasites: mites, nest in log, other ants' nests, prefer performed cavities

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6.Antennal scrobes present (Figs. 68,69: 2b 3a); mandible with 0 or 4 teeth; anterior margin of clypeus concave medially. (dulotic on Leptothorax spp.)(none in TW)	...7.
Antennal scrobes absent (Figs. 70,71: 2b 3a); mandible with 5 or 6 teeth; anterior margin of clypeus convex to indented medially.(none in TW)	...8.

7.Mandible with 4 teeth; median impression of anterior clypeal margin broad and very shallow. (very rare, or with very patchy distribution, one species, P. americanus, collected in Illinois, Indiana, Kansas, Michigan, Minnesota) (2b 3a)	...Protomognathus#.
Mandible with no teeth; median impression of anterior clypeal margin narrow and deep. (very rare, one species, H. canadensis, collected in Michigan and northeast Minnesota) (2b 3a 1a 4a)	...Harpagoxenus#.

Subfamily:	Genus: 7a
Myrmicinae	Protomognathus	P. americanus (Emery) =Harpagoxenus americanus	MN

Subfamily:	Genus: 7b
Myrmicinae	Harpagoxenus	H. canadensis M.R. Smith	MN, Cedar creek

8.Eyes with short, erect hairs projecting between the ommatidia.(commensals of Myrmica, Manica, and Formica, very rare, collected in Michigan, North Dakota, and South Dakota) (2b 3a)	...Formicoxenus*#
Eyes without erect hairs projecting between the ommatidia. (collected in all Midwestern states) (2b 3a)	...Leptothorax (in part: ant=11)

Subfamily:	Genus: 8a	F. hirticornis (Emery)
Myrmicinae	Formicoxenus	F. provancheri (Emery)

Subfamily:	Genus: 8b
Myrmicinae	Leptothorax	many: ant=11, eye w/o hairs