1881.] NATURAL SCIENCES OF PHILADELPHIA. 33 



ward and southward at a sharp inclination, entering a long roobo, 

 E, was a small circular chamber, at one end of which was a beau- 

 tiful gallery,/, running deep downward and inclining slightly west. 

 It was entered near by and above by another gallery, d, running 

 toward the surface. 



2. Nest jSTo. 6, fig. 18. The depth of the gate, G, was three 

 inches ; the length of the arm, A, two inches. The gallery into 

 which A opened toward b, divided at one end with two branches 

 separated at their mouths by a little column of two stones resting 

 one upon the other. The gallery, c, could be traced at least six 

 inches downward, and a gallery opened directly downward at a. 



3. Nest on Eaglehead Ridge, PI. V, fig. 20. This nest, from 

 Avhich many of my night studies were made, was finally opened, 

 and the section view, fig. 20, taken. The vestibule, as in the above 

 examples, also opened into a main gallery, &, which led to the 

 northeast, and joined a circular gallery which passed around the 

 vestibule and terminated in an oval room, A. At the other end it 

 entered a circle, which widened upon one side into a bay-room, 

 and sent off a couple of branches, one of which, c, was a chamber. 

 Two galleries, g g, opened downward. Beyond this, southward, 

 was a long waved gallery, D D, which ended at e e, and branched 

 at h. Galleries, g g, in this series, also led downward. 



No. 4. Fig. 23, Nest No. 4, on Adams Ridge. The diameter of 

 this mound was three and one-half inches at the top and seven 

 inches at the bottom. The vestibule sloped eastward from the 

 summit, downward three inches to the main gallery, which had 

 three branches, x, y and z ; x was followed six inches northeast 

 and upward ; y, extended sovithwest and downward ; 2, southeast 

 and downward. A gallery, 1, ran upward from z, and connected 

 with X. Another, 2, opened on the southwest into a room. A, 

 six inches long and three inches wide, at the west end of which 

 were galleries dividing north and south. A third gallery separated 

 from z at 3, and bent northward, apparently uniting with a room, 

 A, five inches long. This room was entered again by a widened 

 mouth. Be, about one-half inch above z. At the vestibule and 

 upper part of z were a number of cocoons. The room. A, was five 

 inches below the surface of the ground at G. 



Galleries and Honey-Rooms. — The last figure gives an idea 

 of the relation of some of the honey-rooms to the gate and the 

 upper series of galleries. These rooms lie at least as near to the 



