Table 1. The basic measurements of Solenopsis invicta and their combinations.

Abbreviation Dimension (mm) AL alinotum length AH alinotum height HL head length HW1 headwidth across the eyes HW2 headwidth above the eyes, ca. 75% of the distance from the clypeus to the apex of the head HW3 headwidth below the eyes, ca. 25% of the distance from the clypeus to the head apex ML Mandible length MW Mandible width at base FL* flagellum length, minus club length SC scape length CL club length AN Antennal length= FL (with club) + SC GL length of the first gaster segment GW width of the first gaster segment FE (1,2,3) Femur length TB (1,2,3) Tibia length TA (1,2,3) Tarsus length LG (1, 2, 3) Total leg length= FE +TB+TA PL (1,2) Petiole length, segments 1, 2 PH (1,2) Petiole height, segments 1, 2 BL Total body length= HL + AL + PL1 +PL2 + GL (excludes gaster segments>1).