32 AMERICAN SPIDERS AND THEIR SPINNINGWORK. 
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Nesting Architecture of Tarentula opifex. (After Wagner.) 
Fic. 12, Female. Fic. 13. Male. Fie. 14. Watching for prey at the bottom of its burrow, the 
door partly raised. Fic. 15. Section view of the burrow, showing its bottle shape. Fic. 16. Side 
view in outline of door and throat of burrow; s, silk lining of same; h, hinge of silk; cr, crest of 
the door in front; p, portico of same; sw, silken walls. Fic. 17. Outside of door from above. 
Fic. 18. Inside of door, silk lined. Fic. 19. Grouping of eyes. 
