J. H. Mnerton — Canadian Spiders. 419 



Philodromus bidentatus Em., N. E. Thomisidse, 1892. 



Gaspe. Also from Mt. Tom, Massachusetts, and New Haven, 

 Connecticut. 



Philodromus inquisitor Thor. 



Bulletin Hayden's U. S. Geological Survey, vol. iii, No. 2, 1877. 



I have compared the original specimen from Colorado, which has 

 been minutely described by Thorell. This is a large species and the 

 abdomen is unusually large with the widest part in the middle and 

 the hinder half tapering more than the front. The difference in color 

 between the front and hinder halves is generally great, the front 

 half being very light with a middle dark stripe having two pairs of 

 small branches at the sides, while the hinder half has the usual trans- 

 verse light and dark markings of most of the genus. The cephalo- 

 thorax has in some specimens a light middle stripe for half its length, 

 in others the irregular gray markings cover the whole back PI. iv, 

 lig. 8. The legs are as dark as the abdomen, colored irregularly in 

 rings, and at the ends of the joints. The under side is lighter with 

 the epigynum showing distinctly two parallel dark lines, across the 

 front end of which is the transverse oval opening, PI. iv, fig. 8a. 

 Length 6™"'; cephalothorax 2-3"^"' long, 2"^"^ wide. 



Kocky Mts. Laggan, and on path to Agnes Lake, 6700 to 6900 

 ft. Colorado, A. S. Packard. 



Tibellus duttonii Keys. 



Spinn. Americas, Laterigradse. Emerton, N. E. Thomisidee, 1892. 

 Thomisus duttonii Heutz. 



Rocky Mts. Laggan. Lake of the Woods. Ellis Bay, Anticosti. 

 New England. 



Thanatus coloradensis Keys. 



Spionen Americas, 1880. Thanatus lycosoides Emerton, New Eng. Thomisidse, 1892. 



When I described this spider in 1892 I had only seen New Eng- 

 land specimens and was in doubt about its identity with T. colora- 

 densis. Several specimens of both sexes from the Rocky Mountains 

 in the collections of Mr. Bean and Mr. Tyrrell agree better with 

 Keyserling's descriptions and are of the same species as those found 

 in New England. 



Phidippus tripunctatus Emerton, New Eng. Attidse. 



Attus tripunctatus and A. audax Hentz. Phidippus morsitans Peckham. 

 Lake of the Woods, A. C. Lawson. 



