hydro cores, hydro cor isæ

[Prefix hydro, (1), and (Gr. kor is =a bug.] Entom.: Water bugs. One of two tribes of the sub-order Heteroptera. Antenne small, three or four-jointed, concealed behind the eyes, which are generally large; tarsi usually with but one or two articulations. Families No to nec tide and Nepide (q. v.). hy-dro-co-tar-nine, s. [Pref. hydro- (2), and Eng. cotarnine.] Chem.: C12H15 NO3. An alkaloid which occurs in opium, also obtained by the action of Zn+HCl and cotarnine. It gives monoclinic prisms when crystallized from ether, which melt at 50°. It di olves in sulphuric acid with a yellow color, which turns carmine-red on heating, then a dirty violet-red color.