The neurohormone [His7]-corazonin induces darkening of the cuticle of "Locusta migratoria". One of the typical features of "Locusta migratoria" ia that they are gregarious locusts. It has also been detected in the locust, "Locusta migratoria". The American cockroach genome is the second-largest insect genome on record, after "Locusta migratoria". If "Gryllus migratorius" is moved to the genus "Locusta", it becomes "Locusta migratoria".