CHAMBEES OX NEW ENTOMOSTEACA OF COLORADO. 153 



seen by a comparison of the following account with Brady's figures. Su- 

 perior antennae with only twelve instead of fourteen long setie, arranged 

 as follows : — There are two short setse (one longer than the other) from 

 the third joint, which has none in Brady's figure; two short and two 

 l(5ng ones from the fourth joint, where virens has four long ones ; three 

 long ones and one shorter one from the fifth joint, which in virens has 

 four long ones ; four long ones from the sixth joint, where virens has 

 only three; and three long ones and one short one from the last joint, 

 where virens has three long ones. In the inferior antennte, similar differ- 

 ences are found, and in the mandibular palpus even greater ones. The 

 feet of the first pair appear to be identical in the two species, except 

 that this species has a short seta on each of the joints 3 and 4, which 

 are not represented in Mr. Brady's figure. His figure, however, shows 

 one seta more on each of the joints 2 and 3 of the feet of the sec- 

 ond pair than I fiud in this s pecies, which likewise is much smaller 

 than C. virens, being only one-twentieth of an inch long and one-fortieth 

 high, instead of one-fourteenth of an inch long and one-twenty-fifth high, 

 as in virens. In ventral and dorsal view it also resembles virens. Sur- 

 face smooth pubescent, with minute punctures. Color bright deep green. 

 Common in a pond fed by melting snow on the side of Mount Elbert, 

 Colorado, at the height of about 12,000 feet (some distance above tim- 

 ber-line). The water is clear and cold, and seems to contain but little 

 decaying animal and vegetable matter. I did not observe in it any other 

 Entomostracan, though small CoJeoinera [Bytiscidce) and IIemi2)tera vi'ere 

 common in it. This species, or one very similar in external appearance 

 was also found at an altitude of near 8,000 feet, in a puddle by the side 

 of Fall Kiver, Colorado, but my specimens of these were unfortunately 

 all lost. 



C. mons n. sp. (Fig. 3).— Ovoid; tumid; highest immediately before the 

 middle. Length, Jg inch; height, ^V. Dorsal margin regularly arched, 

 sloping more rapidly behind the highest point than before it. Ex- 

 tremities rounded ; the anterior widest ventral margin very slightly 

 sinuated. Seen from above, ovate, but less tumid than Cypridopsis 

 vidua as figured by Baird and Brady (Brit. Ent. and Trans. Linn. Soc, 

 V. 26), But little or not at all narrowed in front ; widest a trifle behind 

 the middle. Lucid spots seven, near the middle of the valve ; the three 

 lower ones in a line and small; one of them very small. Valves white. 



Cypris mons. Cham., u. sp. 



shining, smooth, with numerous almost confluent puncta. The setif ot 

 the lower antennoe extend beyond the apex of the claw.^, and the articn- 



