418 The Arachnida of Colorado. 



Ergane horealis Blk. N. H. ; N. Y. ; Mass. ; Can. ; Pa. ; Wise. ; Colo. ; Idaho; 

 Wash. 



Icius similis Bks. N. H. ; Colo. ; Wash. 

 Aitus monadnoch Em. White Mts. ; Colo. 



The western element is not prominent and is represented by 

 such species as Epeira gemma, Epeira aculeafa, Xysticus discur- 

 sans, Xysticus locuples, Bothriocyrtum californiciim, and Sclero- 

 bunus robustus. And these are mostly' from western Colorado. 

 Further collecting in the western portion of the State will doubt- 

 less increase the per cent, of Pacific forms. 



There are a few t^'pical southern spiders, such as Lathrodectes 

 mactans, Phidip)pus msolens, Pholcus pullulus, Thargalia amosna, 

 and Ceiitrurus carolinus. 



Quite a number are distributed throughout the entire United 

 States — Agalena nseria, Prosthesivia atra, Xysticus gulosiis, 

 Coriar-achne versicolor, Misumena vatia, Philfeus militaris, 

 Dendryphantes octavus, Theridium tepidariorum, Cyclosa conica, 

 Epeira labyrinthea, Tetragnatha laboriosa, Steatoda borealis, 

 Dictyna sublata, Chelifer cancroides. 



A few others are widely distributed over the entire eastern 

 United States, east of the Rock^^ Mountains — Plectana stellata, 

 Argiop)e transversa, Lycosa carolinensis, Pisaura iindata, 

 Habrocestum cacatum, etc. 



The most prominent characteristic is the great number of 

 Thomisidae; it appears to be the leading family, not only in 

 species, but in specimens. But the micro-Therididai, if thoroughly 

 collected, would probably place the Theridida? in the lead of 

 species. The absence of certain forms is quite peculiar ; there 

 are no long-legged Phalangidi^ (Liobunum), the Clubionidae are 

 few in specimens and species, and there are no Anyphtena? ; al- 

 though many northern species are represented, Tetragnatha ex- 

 tensa is absent. Though the Lj'cosidse are quite abundant, I have 

 received but three specimens of Pirata. The Agalendae are not 

 near as common as one would naturally suppose. In the Attidre 

 we miss Saitis, Marptusa and Epiblemum. Although some of 

 these forms may be found with more extended collecting, yet it is 

 not probable that they will appear so numerous as we find them 

 elsewhere. 



I append a list of places with altitudes at which collections 

 were made; this has been prepared by Mr. C. F. Baker. 



