■258 MICHIGAN SURVEY, 1908. 



lY. Mesophytic forest — balsam-spruce or hardwoods. 



Amarohius l)eniictti. 



Tegenaria derliami. 

 V. About Camps. 



Li 1 1 !/p h m p hryg ianu. 

 Dolomedes idoneus. 



From the above tabulation it is evident that, if the collections are 

 representative, most of the spiders prefer the open places, the beach, 

 rock openings or open parts of swamps, the most marked preference 

 being for dry openings. It thus appears that as the forests encroach 

 upon these areas the spider habitats become more restricted. The 

 genus Pardosa seems quite characteristic of the open places. The 

 general Arachnid successions are thus suggested in outline as follows: 

 from beach types and rock openings to the forest; inland from the 

 aquatic types and swamp forms to the forest. Particular attention is 

 directed to the .following habitats which deserve special attention for 

 their bearing on succession ; these are the birch-aspen border and 

 clearing society, and glades or openings in the forest and the forested 

 swamps. An examination of the literature clearly shows that the 

 habitats of spiders have received but little attention. This is an ex- 

 cellent field for study and one certain to give interesting and valuable 

 results. 



Geographic Notes. The following nine species of Isle Eoyale spiders 

 have been recorded from Labrador: Gnaphosa hrumalis, Tetragnatha 

 extcnsa, J'egenm'ia derliami, Cicnrina arcuata, Epeira patagiata, Par- 

 dosa glacialis (also Greenland), Pardosa groenlandica (also Greenland), 

 Pardosa tapidicina and Pardosa tacliypoda. 



The following 'fourteen species have been reported from New Hamp- 

 shire: Drassu^ nvglectus^ Gtvaphosa hru'imalis^ Linyphia phrygiana, 

 Tetragnatha extensa, Epeira patagiata, Glubioha riparia, Tegenaria der- 

 hami, Dolomedes idoiiciis, Lycosa frondicola, Lyvosa pratensis, Par- 

 dosa glacialis, Pardosa groenlandica, Pardosa tacliypoda and Phidippus 

 horealis. 



The following species are found in the mountains of Colorado: Gnap- 

 hosa l}rumalis, Epeira patagiata and Pardosa groenlandica, (Banks, '95). 

 They also occur in New Hampshire, Labrador, and frequent open places. 



REFERENCES. 



Banks, N. 



1893. The Spider Fauna of the Upper Cavuga Lake Basin. Pro. 



Acad. Nat. Sci., Phila. 1S92, pp. 11-81. 



1894. On the Lycosidae of Colorado. Jour. N. Y. Ent. Soc, 2, pp. 



49-52. 



1895. The Arachnida of Colorado. Ann. N. Y. Acad, of Sciences, 8, 



pp. 417-434. 

 1895. Some New Attidae. Can. Ent, 27, pp. 96-102. 

 1898. Arachnida from the Malaspina Glaciei*, Alaska. Ent. News. 



9, p. 16. 

 1904. A Treatise on the Acarina or Mites. Pro. U. S. Nat. Mus., 



28, pp. 1-114. 

 1907. A Catalogue of the Acarina, or Mites, of the United States. 



Pro. U. S. Nat. Mus., 32, pp. 595-625. 



