National Geographic : 1933 Aug
THE NATIONAL GEOGRAPHIC MAGAZINE () National Geographic Society Approximately three times natural size OUR UNWANTED GUEST, THE HOUSE SPIDER, IS AN INTERESTING NUISANCE More than any other species, Theridion tepidariorum is responsible for the irregular, sticky, dust-catching cobweb; but its habits merit study. An adult female (upper left) obliged the artist by posing in the act of pouncing upon a trapped fly. Another, with her shiftless mate below her (upper right), spun some haphazard threads. A third fashioned a silken base (middle left), placed her egg mass within it (middle right), worked down the loose ends (lower left), and finally rested beside her finished cocoon (lower right).