GRYLLUS, in zoology, the name of the cricket and locust kind; which, together with the grasshoppers, make only one genus of insects, belonging to the order of hemiptera. The characters are these: The antennæ are setaceous and filiform; the exterior wings are membranaceous, narrow, and have much of the appearance of the wings of some of the fly-kind; the thorax is compressed and angulated; and the legs are formed for leaping. See Plate CXV. CXL. and the articles GRASSHOPPER, GRYLLOTALPA, LOCUST, (and CRICKET in Appendix.)