Formicinae: key to genera couplet 8
Key: modified from Wheeler & Wheeler (1963), Hölldobler & Wilson (1990), Bolton (1994)

Figures 51,52. Formicinae: Paratrechina parvula

7. Mesonotum weakly constricted with alitrunk lacking obvious hour-glass shape (Fig. 51); with head in full-face view the eyes at or in front of the midlength of the sides (Fig. 52); dorsal surface of head and body with coarse setae that are arranged in distinct pairs. (collected in all Midwestern states) (1b 2b 3b 4b 5b 6b 7b)

...Paratrechina

Mesonotum in dorsal view severely constricted giving the alitrunk a distinctive hour-glass shape (Fig. 53); with head in full-face view the eyes behind the midlength of sides (Fig. 54); Pilosity not conspicuously coarse or bristle-like; erect hairs mostly slender and golden or brownish. (one species, P. imparis collected in all Midwestern states except North and South Dakota (1b 2b 3b 4b 5b 6b 7a) (none in Taiwan)

...Prenolepis

Figures 53,54. Formicinae: Prenolepis imparis

Genus Paratrechina Motschulsky
bourbonica amia Forel, 1913: Bolton, 1995: 312 ™¸¨¸d¿VD
flavipes Fr. Smith, 1874: Chou & Terayama, 1991: 81; - Bolton, 1995: 313. d¿P}d¿VD
formosae (Forel, 1912): Chou & Terayama, 1991: 81; - Bolton, 1995: 313. O¥µ‹d¿VD
kraepelini Forel, 1905: Chou & Terayama, 1991: 81; - Bolton, 1995: 314. ¨_§Ûd¿VD
longicornis (Latreille, 1802): Chou & Terayama, 1991: 81; - Bolton, 1995: 314; - Tang et al., 1995: 99. ®gVD
sauteri Forel, 1913: Bolton, 1995: 315. ™Ú§Ûd¿VD