CHAMBERS ON NEW ENTOMOSTRACA OF COLORADO. 155 



tinct, brownish or smoky streaks, which, however, are sometimes absent. 

 Eye-spot small. The inferior antennae have a small spine near their base, 

 another at the bifurcation, and one from the second joint of the outer 

 branch. In the helmet-like beak and lateral couipression, this species 

 approaches Schodler's genus Ryaloda;phnia. 



A few specimens were taken from a pond on the side of Monnt Elbert, 

 altitude 11,000 feet; and it is abundant in ponds near Covington, Ky., al- 

 tituTie about 500 feet. It is possible, however, that the Kentucky speci- 

 mens may belong to a different species. The above description applies 

 more nearly to the Kentucky specimens. The only ground, however, on 

 which I could separate them as distinct species is that the form of 

 the post-abdomen differs somewhat, as will be seen by reference to the 

 figures. 



Lynceus (Chydorus) spha'Hcusf Baird. — My specimens, taken in a pond 

 on Mount Elbert, at an altitude of about 11,000 feet, were all lost 

 before I had examined them sufficiently to be certain of their identity 

 with si)hcericus. I believe them to be identical with a species which is 

 common in Kentucky, and which differs from s2)Juericus as described by 

 Baird and by ISTorman and Brady only as follows: — This species has five 

 distinct strife passing obliquely from the oral region back over the dor- 

 sal margin, which are not mentioned in the descriptions above mentioned 

 (Baird, Brit. Ent., and N^orman and Brady, Monograph Brit. Lync, &c.}. 

 Baird says, color olive-green; but the color of this species is yellowish- 

 white. 



But little has heretofore been done among the fresh-water Entomo- 

 straca of the United States. The species are, however, very abundant. 

 Some of them seem to be identical with European species. Among 

 species that have fallen under my observation, besides many that are 

 certainly new, are those that I am unable to separate on any satisfac- 

 tory grounds from Cypris incongruens Baird, Cypridopsis vidua Baird, 

 Daplmia pulex Auct., Moina hranchiata and Baplmia mucronata Miiller. 

 One interesting new Cypris seems to be peculiar to the brackish water 

 of Big Bone Springs, Kentucky, where I have also found a new Tachi- 

 (li)is. I have also found a new Diaptomus and a Ganthocamptus in ponds 

 ill ISTorthern Kentucky, besides several new species of Baphniadcc, Lyn- 



<;eid(V, and Cypridcc. 



Explanation of figures. 



a. Caraijace, side view. g. Foot, first pair. 



h. Carapace, dorsal view. h. Foot, secoud pair. 



c. Carapace, ventral view. i. Post-abdominal ramus. 



d. Superior antennte. Ic. $ claspers. 



e. Inferior antennte. /. Lucid spots. 

 /. Mandible and palpus. 



In tbe figure o£ Daplinia, i represents tbe Kentucky form ; i-, the mountain form. 



