4g Canadian Arctic Expedition, 1913-1918 



Order Fhyllopoda. 

 Suborder Notostraca. 



Family APODIDAE Burmeister. 

 Genus Lepidurus Leach. 



Lepidurus arcticus (Pall.)' 



' Monoculus arcticus. Pallas, 1793, App. (p. 679), p. 39. 



A-pus glacialis, KrOyek, 1847, p. 431; Grube, 1853, p. 150; Reinhahdt and 

 SchiOdte, 1857, p. 35, 73; Lilljeborg 1872, p. 843; VanhOffen, 1897, p. 

 175; JoHANSEN, 1911, p. 333; Stephensen. 1917, p. 284. 



Lepidurus glacialis, Baird, 1852, p. 6, Tab. XXII, fig. 2; Packard, 1873, p. 619; 

 and 1883, p. 316, Plates 16, 17, 21; Lilljeborg, 1877, p. 11; Murdoch, 

 1885, p. 149; Simon, 1886, p. 429; Guerne and Richard, 1889, p. 631; 

 Wesenberg-Lund, 1894, p. 87, and 1896, p 135; Sars, 1874, p. 88; 1886, 

 p. 70; 1891, p. 27; and 1896, p. 68, Plates XI-XIII; Richard, 1897, p. 194, 

 and 1898, p. 327-33; Linko, 1901, p. 66; Haberbosch, 1916, p. 134. 



Lepidurus arcticus, Sars, 1897, pp. 470-3; 1911, p. 15; Lilljeborg, 1900, p. 3; 

 ORfMAN, 1901, p. 145; Ekm^n, 1905, p. 14; Zykoff, 1905, p. 342; Brehm, 

 1911, p. 306, PI. 18; Olofsson, 1918, p. 383, fig. 18-19; Johansen, 1921, 

 p. 47, ("Can. Field-Nat."). 



Expedition Records 



Lake (lagoon) at Teller (Port Clarence), Alaska, July 25, 1913, 3 females. 



Lagoon-pond at Martin point, Arctic Alaska, July 26, 1914, 40 females. 



Lake inland at Bernard Harbour Northwest Territories, August 10, 1915, 

 11 females. 



Pond on ridge at Bernard harbour, Northwest Territories, August 16, 1915, 

 -42 females, 2 males. 



Pond on ridge at Bernard harbour, Northwest Territories, October 6, 1915, 

 -2 females. 



Pond on ridge at Bernard harbour, Northwest Territories, July 3, 1916, 30 

 specimens (immature). 



Other Records. 



Tundra pools at Point Barrow and Ooglamie, Alaska, July 10, 21, 1882. 

 J. Murdoch coll. (Murdoch, 1885, p. 149), 65 females. 



Ponds on coastal plain of Arctic ocean at lat. 69° 40' N., long. 141° W., 

 July 25, 1912, J. M. Jessup coll. 10 females, 6-15 mm. long. 



Cape Krusenstern, Northwest Territories, August 19, 1849, J. Rae coll. 

 (Baird, 1852, p. 6). Four males (?) about 10 mm., 9 females 11 to 20 mm. long.^ 



Prof. G. O. Sars tells me in a recent letter (April, 1921), that this species 

 was also secured by the "Gj6a"-Expedition (Amundsen), at Gjoa-Havn, south 

 side of King William island, on the following dates: August 12, 23, 1904; August 

 6, 1905. The specimens are very many, and measure from 5 to 20 mm. in 

 length. 



1 Prof. G. O. Sars tells me in a recent letter that the proper specific name is arcticus, and not glacialis, 

 because it is now definitely established that Monoculus arcticus Pallas (1793) is the same as Apus glacialis 



2 The four smallest specimens are in poor condition; the 8 largest (15-20 mm.) females carry winter- 

 eggs. 



