Requested reference
Gertsch, W. J. (1955). The North American bolas spiders of the genera Mastophora and Agatostichus. Bulletin of the American Museum of Natural History 106: 221-254. 
-- Show included taxa
Gertsch, W. J. (1955). The North American bolas spiders of the genera Mastophora and Agatostichus. Bulletin of the American Museum of Natural History 106: 221-254. -- Show included taxa