. The Cambridge natural history. Zoology. ADEPHAGA AMPHIZOIDAE PELOBIIDAE 207 genera; the Carabides are next in importance, with upwards of 2000 species, but are divided into a comparatively large number of tribes, each of which averages a much smaller number of genera than do the tribes of Harpalides; Pseudomorphides includes only about 100 species ; and Mormolycides consists of the single genus Jlormolt/cc with three species. Fam. 6. Amphizoidae.—Antennae destitttte of •piibescence: outer lobe of viaxilla not jointed; metasternum with a short transverse impressed li^ie on the middle behind.
. The Cambridge natural history. Zoology. ADEPHAGA AMPHIZOIDAE PELOBIIDAE 207 genera; the Carabides are next in importance, with upwards of 2000 species, but are divided into a comparatively large number of tribes, each of which averages a much smaller number of genera than do the tribes of Harpalides; Pseudomorphides includes only about 100 species ; and Mormolycides consists of the single genus Jlormolt/cc with three species. Fam. 6. Amphizoidae.—Antennae destitttte of •piibescence: outer lobe of viaxilla not jointed; metasternum with a short transverse impressed li^ie on the middle behind. Hind legs slender, not formed for sioimming. This family is limited to the genus Amphisoa; the species of which may be briefly de- scribed as lowly organised Carabidae that lead an aquatic life. The geo- graphical distribution is highly remarkable, there being but three species, two of which live in Western jSTorth America, the third in Eastern Tibet. The habits of American Am- phizoa are known ; they pass a life of little activity in very cold, rapid streams; they do not swim, but cling to stones and timber. The larva was recently discovered in Utah by Messrs. Hubbard and Schwarz:^ it has the same habits as the perfect Insect, and in general form resembles the larvae of the genus Carahus; but it has no terminal tube to the body, the abdomen consisting of eight segments and a pair of short terminal appendages; the spiracles are obsolete, with the exception of a pair placed near to one another at the termination of the eighth abdominal segment. As regards the mouth this larva is Carabid, as regards the abdomen and stigmata Dytiscid of a primitive type. Fam. 7. Pelobiidae.—Antennae destitute of pjibescence : outer lobe of maxilla jointed, metasternum ivith a short transverse impressed line .on the middle behind. Hind legs rather slender, 1 P. ent. Soc. Washington, ii. 1892, p. Fig. 93.—Amphbna lecontei. North America. A, Larva ; B, Please note that these ima
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
