Figure 3. Head width measurements of workers from various sources. Colored points are measurements from Antweb.org, background grey points are measurements by CR Smith, and lines represent the min and max head size as reported by Cole (1984). The inset is a violin plot showing the distribution of worker size range overlap as measured from Antweb.org and by Cole (1984). An overlap of 1 would mean that both sources report the exact same size range for a species; an overlap less than one means that Antweb.org underestimates variation relative to Cole. The proportion overlap between these two sources is not different than 1 (t = 1.26, df = 16, P = 0.23). The measurements present on Antweb.org are largely representative of worker variation in the species examined.