Their strong, sharp, piercing stylets enable them to pierce through the toughest skin of animals and through the thin clothing of man. The bite is very severe and irritating, and as the flies sometimes occur in great numbers the annoyance that they cause is often very great indeed.

The maxillary palpi are greatly developed, but the chief characteristics are the two-jointed stylets arranged in nine pairs along each side of the abdomen, reminding us of the abdominal legs of Myriopods. The body ends in three long bristles, as in Lepisma.

In general form Lepisma may be compared to the larva of Perla, a net-veined Neuropterous insect, and also to the narrow-bodied species of cockroaches, minus the wings. The body is long and narrow, covered with rather coarse scales, and ends in three many jointed anal stylets, or bristles, which closely resemble the many jointed antennæ, which are remarkably long and slender.

Further study, however, of the homologies of these peculiar appendages, and especially a knowledge of the embryological development of Lepisma and Machilis, is needed before this interesting point can be definitely settled. The three many jointed anal stylets may, however, be directly compared with the similar appendages of Perla and Ephemera.

Under their arms, they carry portfolios filled with sketches; in their hands, boxes of water-colors, pencils, and, tied together like fasces, a bundle of fine stylets the sharp points of which glitter ostensibly.

The abdomen ends in three long and many jointed stylets, and there are the usual "false branchial feet" along each side of the abdomen. There are two European species which occur in greenhouses. No species have yet been found in America. The next family of Thysanura is the Campodeæ, comprising the two genera Campodea and Japyx.

He read about the construction and habits of the owl: "In the tawny, or brown, owl there is a manubrial process; the furcula, far from being joined to the keel of the sternum, consists of two stylets, which do not even meet; while the posterior margin of the sternum presents two pairs of projections, with corresponding fissures between."

Tucked under their arms, they carry portfolios filled with sketches; in their hands are boxes of water-colors, pencils, and, bound together like fasces, a bundle of fine stylets with the sharp and glittering points.

Tucked under their arms, they carry portfolios filled with sketches; in their hands are boxes of water-colors, pencils, and, bound together like fasces, a bundle of fine stylets with the sharp and glittering points.

Clerks lay all around on the rough dusty boards, writing with agate stylets on tablets of black papier-mache; and there was a constant flux and reflux of people of all sorts, who appeared to have nothing to do and who were doing it with a sedulously lounging deliberation that seemed to imply a gratifying absence of arrears of official work.