Members of the genus Leptocorisa have long been known in the East as serious pests of rice. A great deal of confusion, however, has existed between the various species, and in many cases there has been considerable uncertainty as to the identity of the insect responsible for damage in any given locality. L. varicornis, F., and L. acuta, Thunb., in particular, have been constantly confused. Leopoldo Uichanco, for example, expressed some doubt as to the determination of the species described by him in his paper on the Philippine rice bug (Philippine Agric. Review, xiv, 1921, pp. 87–125). This confusion was due, no doubt, not only to the general similarity of the two species and the briefness of the original descriptions, but also to the existence of other closely allied species.