DESCRIPTIONS OF TWO NEW SPECIES OF ENTOMOSTRACA 

 FROM COLORADO, WITH NOTES ON OTHER SPECIES. 



By G. S. DoDDs, 



Of the Department of Zoology, University of Missouri, Columbia, Missouri. 



The following notes and descriptions are based upon material col- 

 lected by the author during four seasons spent at the Summer Moun- 

 tain Laboratory of the University of Colorado, at Tolland, Colorado. 

 The laboratory is at an elevation of about 8,900 feet, at the edge 

 of an area with a large number of small glacial lakes, in which is 

 found an abundant entomostracan famia. 



Subclass PHYLLOPODA. 



Order ANOSTRACA. 

 Family STREPTOCEPHALIDAE. 



STREPTOCEPHALUS COLORADENSIS, new species. 



J/aZe.— The frontal appendage is finger-shaped and reaches to 

 about three-fourths of the length of the first joint of the second 

 antennae. The first antennae are slender, shghtly tapering, and 

 reach about to the end of the first joint of the second antennae. ' The 

 second antennae are of the usual three-jointed type of the genus. 

 The first joint is about twice as long as wide, very sfightly curved 

 backwards, and has the front margin decidedly longer than the 

 back. It is slightly narrower at the distal than at the proximal end. 

 The appendage at the posterior distal margin is about as long as the 

 joint itself, is slender and moderately tapering. The second joint is 

 much more slender than the first and just a little shorter. It is bent 

 abruptly at about the middle. The third joint is shorter than either 

 of the others and bears two long appendages wliich cross each other 

 scissors fashion, the proximal one being on the outside. These 

 appendages are directed in a downward and posterior direction. 

 The proximal one has a length about equal to the combined length 

 of the first two joints of the antenna. Its proximal two-fifths' is 

 flattened and its forward margin is roUed inward, forming a very 



Proceedings U. S. National Museum, Vol. 49— No.2096. 

 81022°— Proc.N.M.vol.49— 15 7 97 



