Habitat preferences of three Chorthippus species (Orthoptera: Acrididae) in the Chelmsford area The combined densities per m2 of all Chorthippus species was highest at Mill Green Common and Sturgeon's Track (Table 2). Low combined densities were in evidence at agricultural sites such as Writtle Set-aside and Long Meadow. However, individual species differed in their site preferences. C. albomarginatus was significantly more abundant at Highwood Set-aside and Sturgeon's Track than at any of the other sites (P