trapdoor spider

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various spiders of the family Ctenizidae, found in warm climates, that construct a silk-lined burrow concealed by a hinged lid.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun any spider, of the family Ctenizidae, that constructs a silk-lined burrow with a hinged lid