HEMIPTERA, derived from hemiptera half, and ptera wing, in the Linnæan system, the second order of insects, comprehending twelve genera, viz. the Matta, mantis, gryllus, fulgora, cicada, notonecta, nepa, cimex, ophis, chermes, coceus, and thrips, and a great number of species. See ENTOMOLOGY, INSECTS, and ZOOLOGY.