A summary of the known North American Amaurobiidae

A recent survey o f the spiders o f the family Amaurobiidae, sens, str., in the collection o f the University o f Utah made it evident that a number o f species and also generic groups occurring more especially in the western states had heretofore escaped detection and naming. It also seemed evident that a satisfactory monographic treatment o f the group must await more thorough collecting in most areas o f the West. The present paper is therefore meant merely to catalogue the species at present known from America north of Mexico and to give preliminary diagnoses o f such new species and genera as are detected in our collection.