Ariadna bicolor is a tube-dwelling spider

Tube-dwelling spider

The tube-dwelling spiders consist of two large and widespread genera and one monotypic genus...

. The spider's cephalothorax

Cephalothorax

The cephalothorax is a tagma of various arthropods, comprising the head and the thorax fused together, as distinct from the abdomen behind. The word cephalothorax is derived from the Greek words for head and thorax...

 and legs are yellowish-brown and its abdomen

Abdomen

In vertebrates such as mammals the abdomen constitutes the part of the body between the thorax and pelvis. The region enclosed by the abdomen is termed the abdominal cavity...

 is purplish-brown.

John Henry Comstock said that the habitats of the species are remarkable. He brought the spiders from Ithaca

Ithaca

Ithaca or Ithaka is an island located in the Ionian Sea, in Greece, with an area of and a little more than three thousand inhabitants. It is also a separate regional unit of the Ionian Islands region, and the only municipality of the regional unit. It lies off the northeast coast of Kefalonia and...

and made them a home that had blocks nailed together that each had a hole. The spiders used the man-made habitat as a nest.

In a test about what species of spider replied the fastest to odors, Ariadna bicolor responded slowly. When they weren't in their tubes, they responded in 63 seconds to five oils. When they were in their tubes, they didn't respond to the odors at all.