PACKARD.] PHYLLOPODS OF NORTH AMERICA. 339 
‘rather larger. The claspers of the male are large, thick, and long, ex-. 
tending to the base of the last pair of-feet. The basal joint is provided 
with stout prominent tubercles at the base; the joint itself is nearly 
one-fourth longer than the distance between the outstretched eyes. The 
second joint is one-half as thick as the first, and as long as the first be- 
yond the basal internal knobs; it is slightly bent near the base, the tips 
broad, rounded, and suddenly bent inwarils a little. The forks of the 
penis are long, slender, suddenly curving outwards, and nearly meeting 
at the tips over the median line of the body. The caudal appendages 
are rather long and slender, nearly twice as long as the terminal seg- 
ment, though shorter than in B. paludosa, and not slightly contracting 
near the base as in B. paludosa. Female larger and stouter than in B. 
paludosa; the ovisac very long and slender, reaching to a point beyond 
the middle of the penultimate abdominal segment, and with the lobes 
acutely pointed. The 2d antennz are much broader than in B. palu- 
dosa, being more triangular and coming more gradually to a mucronate 
point than in B. paludosa. In life this species is of different shades, 
from deep salmon or flesh color to pale whitish. 
Length of body of male, 18"™; length of male claspers, 7™"; of 2d 
joint, 3°"; of caudal appendages, 1”. 
Length of female, 17"; length of ovisac, 8™”. 
Described from several hundred specimens collected by myself from 
a small pond or pool forming the head of a brook above timber line and 
near the snow line, about 12,000 feet elevation, near the trail leading to 
the summit of Gray’s Peak; it is doubtful if this pond ever dries up, as 
I have seen it full in the summers (August) of 1875 and 1878. They 
were observed m great abundance August 21, associated with a species 
of Daphnia, and swam .as usual on their backs; a number were seen 
copulating. They thus live under almost exactly the same meteorologi- 
cal conditions as B. paludosa in Northern Labrador and Greenland, the 
temperature near the snow line in Colorado in August being about the 
same as that of Northern Labrador and Greenland in August. 
My first published brief description was drawn up from a female speci- 
men from a ‘‘pond on a mountain near Twin Lake Creek, Colorado, eleva- 
tion 12,500 feet” (Hayden’s Survey of Colorado, 1873, collected by Lieut. 
W. L. Carpenter, U.S. A.); also from about 100 males and females with 
eggs. Colorado, Dr. Viele (Museum Comp. Zoology, Cambridge, no date). 
From Mr. V. T. Chambers we have received the following note re- 
garding the occurrence of this form in Colorado: 
Beauchinecta Coloradensis occurs in countless thousands in a pond fed by melted 
snow on top of Weston’s Pass, altitude 11,676 feet elevation (Hayden), and a Caddis 
larva feeds voraciously upon it. 
BRANCHINECTA LINDAHLI 0. sp. 
Plate XI, figs. 1, 7. 
One male.—Body robust ; 2d antenne or claspers short and stout; 1st 
joint of the usual thickness and much as in BS. coloradensis, but much 
shorter, at least a third; 2d joint as long as the basal, curved, distinetly 
triquetal, with the angles prominent; much thicker than in B. colora- 
densis, rather blunter at the end than in B. coloradensis, and with the 
inner side of the tips larger and more turned in than in B. coloradensis, 
giving an entirely different appearance to the joint. Male genital or- 
gans much as in the Colorado species, but the caudal appendages some- 
what longer, otherwise of the same form. 
Twelve females.—Kyes rather large; 2d antenne slightly shorter, less 
blunt than in B&. coloradensis. Oviduct with the lower lip acutely pro- 
