Thoracophorus, Motschulsky, 1837

Ferro, Michael L., 2015, Review Of The Genus Thoracophorus (Coleoptera: Staphylinidae: Osoriinae) In North America North Of Mexico, With A Key To Species, The Coleopterists Bulletin 69 (1), pp. 1-10 : 4

KEY TO THE SPECIES OF THORACOPHORUS

IN NORTH AMERICA NORTH OF MEXICO

1. Eyes visible from above; combined length of pronotum and elytra <0.7 mm; pronotal disc with 2 sublateral ridges ( Fig. 7 ); Florida ...... ........................... T. guadalupensis Cameron

1′. Eyes not visible from above; combined length of pronotum and elytra> 0.8 mm; pronotal disc with 2 apically bifurcated, sublateral ridges ( Fig. 6 ), or pronotal disc with 4 ridges ( Figs. 4–5 ); widespread including Florida ...... 2

2. Pronotal disc with 2 apically bifurcated, longitudinal ridges ( Fig. 6 ); vertex of head with 2 irregular carinae; extreme southern USA: Arizona east to Florida ...................... ............................. T. brevicristatus (Horn)

2′. Pronotal disc with 4 longitudinal ridges ( Figs. 4–5 ); vertex of head with 4 complete carinae; widespread: Maine to central Alberta south to Montana and central Texas, east to southern Florida ......... T. costalis (Erichson)

Figures

Figs. 4–7. Thoracophorus species, habitus. 4) T. costalis, teneral, contracted specimen; 5) T. costalis, mature, extended specimen; 6) T. brevicristatus; 7) T. guadalupensis.