April, 1901 J 
Osborn — Zoological Notes. 
87 
species which are responsible for particular kinds of tracks is a 
fascinating though somewhat complicated study. Several of these 
have been identified with certainty, and a brief description of them 
in connection with a reproduction of some photographs may be of 
interest. Toad tracks are numerous and quite conspicuous and consist 
of four slight imprints in the sand, these occurring with regularity in 
length corresponding with the length of the leap and the tracks, 
with the distance between them, corresponding with the size of the 
Fig. 2.— Footprints of Toad, Grass-hopper and Millipede. 
Photo by H. Osborn. 
individual. These are shown in Figure 2, between the points marked 
X. The abundant grass-hopper, described more fully in another para- 
graph, produces when walking a continuous series of fine imprints in 
two or three more or less distinct lines on either side, mid way between 
which is a narrow groove formed by the dragging of the abdomen. 
These tracks begin and end abruptly in case the insect is alarmed 
and leaps into the air. Several of these lines of imprint are shown 
in the figure— one distinct one above the point in Figure 2, marked 
+■ Another very characteristic one that is easily referred to the 
millipede consists of parallel lines, in which the imprints of the 
individual feet are scarcely visible, and between which the sand is 
smoothed by the under surface of the body. In Fig. 2 under o. 
