Formicinae: key to genera, couplet 5

Formicinae: key to genera couplet 5
Key: modified from Wheeler & Wheeler (1963), Hölldobler & Wilson (1990), Bolton (1994)

Taxa remaining

Acanthomyops
Formica
Lasius
Paratrechina
Prenolepis

Figure 37. Formicinae: Formica argentea

Figure 38. Formicinae: Formica incerta

Figure 39.Formicinae: Lasius neoniger

5. Frontal carinae short but distinct, each a small ridge with a moderately to sharply angulate summit that is sometimes slightly reflected upward (Figs. 37,38); ocelli conspicuous (Figs. 37,38); with gaster in ventral view the first sternite with a conspicuous transverse sulcus behind the helcium; propodeal spiracle elliptical to broadly oval.
(collected in all Midwestern states) ...Formica

Frontal carinae indistinct or absent (Fig. 39). If present, each carina is a small ridge with a distinctly rounded summit; ocelli small or absent; with gaster in ventral view the first sternite without a transverse sulcus behind the helcium; propodeal spiracle circular to subcircular. ...6.

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5. Frontal carinae short but distinct, each a small ridge with a moderately to sharply angulate summit that is sometimes slightly reflected upward (Figs. 37,38); ocelli conspicuous (Figs. 37,38); with gaster in ventral view the first sternite with a conspicuous transverse sulcus behind the helcium; propodeal spiracle elliptical to broadly oval. (collected in all Midwestern states)	...Formica
Frontal carinae indistinct or absent (Fig. 39). If present, each carina is a small ridge with a distinctly rounded summit; ocelli small or absent; with gaster in ventral view the first sternite without a transverse sulcus behind the helcium; propodeal spiracle circular to subcircular.	...6.