EXPLANATION OF PLATE. 



Fig. I. — Aerial portion of a tube of Atypus niger Hentz (?), attached b}' its 

 upper extremity to bark of pine tree — side view; a, remains of devoured insects 

 adhering to the outside of the tube. 



Fig. II. — Front view of the same tube, showing mode of attachment by brushes 

 of silk, bb,- a, insect remains. 



Fig. III. — Subterranean portion of tube, showing that its walls are not adherent 

 as a "lining" to the walls of the excavation; a, root of the supporting tree. 

 Diagrammatic. 



Fig. IV. — Aerial portion of a tube supported by a small persimmon shrub ; a, 

 insect remains; bb, attaching brushes of silk; c, silk threads enveloping the 

 twig. 



Fig. V. — Diagrammatic representation of the spider's fangs thrust through the 

 tube wall and grasping a fascicle of pine leaves. 



