Figure 30 from: Bousquet Y (2012) Catalogue of Geadephaga (Coleoptera: Adephaga) of America, north of Mexico. ZooKeys 245: 1-1722. https://doi.org/10.3897/zookeys.245.3416

Figure 30 - Chlaenius purpuricollis Randall. This relatively small chlaeniine had been rarely collected until pitfall trapping showed that it is common in alvars, which are flat, relatively open grassy areas with shallow or sporadic soil cover over calcareous bedrock. Alvars are known from Sweden, Estonia, New York, Michigan, Ohio, and particularly central Canada. The chlaeniine is also found in similar habitats in other parts of North America.