NOTES ON ENTOMOSTRACA FROM COLORADO. 



THE SHANTZ COLLECTIONS FROM THE PIKES PEAK REGION. 



G. S. DODDS, 

 Of West Virginia University. 



The collections of entomostraca described in this paper were made 

 by Dr. H. L. Shantz, mainly during the summers of 1903 and 1904. 

 He made them the basis of a paper/ in which he gives a full descrip- 

 tion of the lakes, together with notes on various features of their fauna 

 and flora. Full determination of the species of entromostraca in the 

 collections were not, however, included in that paper. The collections 

 have since been turned over to the United States National Museum, 

 and at the request of the curator of marine invertebrates I have made 

 determinations of the species. A number of the vials of the lot had 

 dried, but there remained 169 vials of material in good condition, 

 most of which contained entomostraca. 



These collections are from two groups of lakes, one including nine 

 bodies of water near timber line on the slopes of Pikes Peak, at eleva- 

 tions of 3,110 to 3,626 meters (10,200 to 11,890 feet) above sea level, 

 the other 14 lakes and ponds on the plains, near Colorado Springs, 

 just at the eastern base of Pikes Peak, at elevations of 1,800 to 2,203 

 meters (5,969 to 7,225 feet). It should also be noted that five of the 

 lakes in the higher group were described by Ward * in 1904, the paper 

 including a list of 13 species of entromostraca. This paper and the 

 one by Shantz describe the region and the lakes so well that no further 

 notes are needed in the present paper. The collections of Shantz 

 should also be considered in connection with findings of the author in 

 studies of entomostraca from both mountains and plains of Colorado, 

 mainly from collections from the region of Boulder and Tolland, 

 Colorado, about 65 miles north of Pikes Peak.^ 



Thirty-one species of entomostraca have been identified from the 

 collections of Shantz, distributed as follows: Phyllopoda 1, Cladocera 

 19, Copepoda 11 species. For a detailed list of the species collected 

 in each lake see Table 1 . Three of these species have not previously 

 been reported from Colorado, Bi'phanosoma iracJiyurum, CeriodapTinia 



I Shantz, H. L. A Biological Study of the Lakes of the Pikes Peak Region, Trans. Amer. Micros. Soc., 

 vol. 27, pp. 75-98, with three plates, 1907. 



» Ward, Henry B. A Biological Reconaissance of some Elevated Lakes of the Sierras and the Rockies, 

 Trans. Amer. Micros. Soc., vol. 25, pp. 127-154, with 12 plates. 



3 DoJds, G. S. Descriptions of Two New Species of Entomostraca from Colorado, with Notes on Other 

 Species, Proc. U. S. Nat. Mus., vol. 49, pp. 97-102, 1915; Altitudinal Distribution of Entomostraca in 

 Colorado, Pro;. U. S. Nat. Mas., vol. 54, pp. 58-87, 1917; Entomostraca and Life Zones, Biol. BuU., vol. 

 39, pp. 89-107, 1920. 



No. 2531 — Proceedings U. S. National Museum. Vol. 65 Art. 18. 

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