Myrmicinae: key to genera, couplet 7

Myrmicinae: key to genera couplet 7
Key: modified from Hölldobler & Wilson (1990), Bolton (1994)

Subfamily: Genus: 7a

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

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)
...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)
...Harpagoxenus#.

Subfamily: Genus: 7b

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

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

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)	...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)	...Harpagoxenus#.

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