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 inwards 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 ])enultimate abdominal segment, and with the lobes 

 acutely pointed. The 2d antennse are much broader than in B. palu- 

 dosa, being more triangular and coming more gradually to a mucronate 

 point than in B. paludosa. In Lfe this species is of different shades, 

 from deep salmon or flesh color to pale whitish. 



Length of body of male, 18""° 5 length of male claspers, 7""" 5 of 2d 

 joint, 3"""; of caudal appendages, l"". 



Length of female, IT""™; length of ovisac, 8"™. 



Described from several hundred sjjecimens 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 in 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" (Haydeu's Survey of Colorado, 1873, collected by Lieut. 

 \V. L. Carpenter, TJ. 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. 



Beanchinecta lindahli n. sp. 



Plate XI, figs. 1, 7. 



One male. — Body robust ; 2d antennse or claspers short and stout; 1st 

 joint of the usual thickness and much as in B. coloradensis, but much 

 shorter, at least a third; 2d joint as long as the basal, curved, distinctly 

 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 lorm. 



Ticelve females. — Eyes rather large; 2d antennte slightly shorter, less 

 blunt than in B. coloradensis. Oviduct with the lower lip acutely pro- 



