The adults of _Oedemagena tarandi_ (L.) were determined by Mr. C. W. Sabrosky, of the Bureau of Entomology and Plant Quarantine; and the larvae of _Oedemagena_ and _Cephenemyia_ by Dr. W. W. Wirth, of the same bureau. The larvae of the latter genus are regarded as probably _C. trompe_ (L.); they were new to the collection of the United States National Museum. _References._--Hearne, 1795: 197; Franklin, 1823: 241; Richardson, “1825”: 328-330, and 1829: 242; Godman, 1831, +2+: 284; Murray, 1858: 210; B. R. Ross, 1861: 438; Pike, 1917 (1892): 58-59; J. B. Tyrrell, 1892: 128, and 1894: 442; Whitney, 1896: 239; Russell, 1898: 228-229; Jones, 1899: 411; Hanbury, 1900: 67, and 1904: 32, 137, 194; Preble, 1902: 41; R. M. Anderson, 1913b: 504; Stefánsson, 1913b: 204, 212-213, 333; Douglas, 1914: 191-192; Malloch, 1919: 55-56; Hewitt, 1921: 67; Johansen, 1921: 22-24, 29, 35, 37; Stefánsson, 1921: 247; Blanchet, 1925: 32, and 1926b: 47; Birket-Smith, 1929 (1): 56, 133; Seton, 1929, +3+: 109-111; Critchell-Bullock, 1930: 193; Hoare, 1930: 33, 37-38; Kitto, 1930: 89; Jacobi, 1931: 244-245; Munn, 1932: 58; Sutton and Hamilton, 1932: 84-86; Birket-Smith, 1933: 90, 92; Ingstad, 1933: 48, 135; Hornby, 1934: 105; Soper, 1936: 429; Henriksen, 1937: 25, 26; Hamilton, 1939: 247, 301; Murie, 1939: 245; Clarke, 1940: 70, 95; Downes, 1943: 226, 255; Manning, 1943a: 53; Porsild, 1943: 386; Gavin, 1945: 228; Harper, 1949: 228; Banfield, 1951a: 31-33; Barnett, 1954: 104. _Ectoparasites_ It was in vain that I searched a number of fresh specimens for lice, mites, fleas, or ticks. The Schweder boys spoke of never having noticed any such parasites. Seton (1929) mentions none, and Jacobi (1931: 243) records only a louse (_Linognathus tarandi_) from the Reindeer. “Lice are not known from caribou according to Ferris (in conversation)” (Weber, 1950: 154). _Relations to Reindeer_ Recent discussions of the possibility or advisability of introducing domesticated Reindeer to replace, or to augment the diminishing supply of, native American Caribou in various new localities prompt a brief review of the subject. It may be remarked at the outset that acclimatization attempts in the Old World have generally been abortive. Wild Reindeer introduced from Finmark into Iceland in the eighteenth century flourished for a time, but by 1917 they were almost exterminated. A number of different introductions into Great Britain, Denmark, Germany, Austria, Switzerland, and Italy came to naught. On the other hand, the introduction of Lapland Reindeer on the subantarctic island of South Georgia in 1908 seems to have turned out successfully. (Jacobi, 1931: 158-165; Harper, 1945: 473-474.) A saving feature in each of the above-mentioned cases was the absence of any native Reindeer whose racial purity might have been destroyed by the newcomers.