Formicidae: key to subfamilies, couplet 3

Formicidae: key to subfamilies, couplet 3
Key: modified from Creighton (1950), Wheeler & Wheeler (1963), Hölldobler & Wilson (1990), Bolton (1994)

Taxa remaining

Dolichoderinae
Ecitoninae*
Formicinae

Figure 9.Formicinae: Lasius umbratus

Figure 10.Formicinae: Acanthomyops coloradensis

Figure 11 and 12.Dolichoderinae: Tapinoma sessile

3. Cloacal orifice circular, terminal and usually surrounded by a fringe of hairs (acidopore) (Figs. 9,10: 1b 3a) (collected in all Midwestern states).
...Formicinae

Cloacal orifice ventral and slit-like; hairs, when present not forming an encircling fringe (no acidopore) (Figs. 11,12: 1b 3a) (collected in all Midwestern states).
...Dolichoderinae

3. Cloacal orifice circular, terminal and usually surrounded by a fringe of hairs (acidopore) (Figs. 9,10: 1b 3a) (collected in all Midwestern states).	...Formicinae
Cloacal orifice ventral and slit-like; hairs, when present not forming an encircling fringe (no acidopore) (Figs. 11,12: 1b 3a) (collected in all Midwestern states).	...Dolichoderinae