19. RissA. 305 



u. d"ad. ak. Davis Strait, 73= N. lat. (P«ny« The Admiralty [P.]. 



lii'd Voy(t<ie). 



V. Jiiv. sk. NaiKirtalik, Greenland, Jan. II. Saunders Coll. 



^D. 2 ad. sk. Dobbin Day, Greenland, Aug. II.M.S. 'Alert' Ex- 



28, 1870 {Col. Feiklm). ped. [P.]. 



19. RISSA. 



Type. 



Gavia, Boie, Isis, 1822, p. .5('>3 (partim). 



liissa, IStephens, ex Lench AIS. in Shaw's Gefi. Zool. 



xiii. pt. 1, p. 180 ( 1S2(!) R. tridaetyla. 



Cheimonea, Kaup, Natiirl. Syst. p. 84 (1829) It. tridactyla. 



liange. Arctic and Sub-Arctic regions : in winter down to about 

 30° N.'lat. 



Key to the Species. 



a. Tarsi and toes dark brown to blackish ; under 



wiug-covcrts white ; young with a strongly- 

 marked black band from the carpal joint to the 

 long inner secondaries, and a black band on 

 tlie tail tridactyla, p. 305. 



b. Tarsi and toes vermilion ; under wing-coverts 



grey ; young with no black band on the wing 



nor on the tail ; bill shorter; mantle darker .. byevirostris,'^.Z\2. 



1. Rissa tridactyla. 



The Coddy Moddy, Alhin, Nat. Hist. B. ii. p. 80 (1740: imra.). 



La Mouette cendr^e tachet(5e, Brisson, Orn. vi. p. 185, pi. xvii. 

 fig. 2 (1760) ; Dauhent. PL Enl. pi. .387 (1786). 



I>a Mouette d'hiver, Bri^s. Orn. vi. p. 189 (1760). 



Larus ris.sa, Linn. Syst. Nat. i. p. 224 (1766) ; Fhi})j)s, Voy. N. Pale, 

 App. p. 187 (1774) ; P. L. S. MiUl. S. N, Anhany, p. 344 (1776) ; 

 Bcchst. Natury. Deutschl. ii. p. 804 (1791) ; Pallas, Zooyr. liosso- 

 Asiat. ii. p. 321 (1811 : Kamschatka) ; Leach, Syst. Cat. Brit. Mns. 

 p. 40 (1816) ; id. in J. Boss's Foi/. Baff. Bay, 8vo ed. ii. App. 

 p. 159 (1819); Scoresbi/, Arct. Voy. i.'p. 534 (1820); Fleminy, 

 Brit. Anim. p. 141 (1828); Selby, Brit. B. ii. p. 493, pi. xciv. 

 (1833) ; Gould, B. Eur. v. pi. 435 (1837): Meijer, Brit. B. vii. 

 p. 139, nl. 305 (1857) ; Huxley, P. Z. S. 1867, p. 430, tig. 2 

 (skull). ^ 



Larus tridactvlus, Linn. Syst. Nat. i. p. 224 (1776) ; P. L. S. Miiller, 

 S. N, Anhciny, p. 344 (1776) ; 0. Fair. Faun. Grwnl. p. 98 (1780) ; 

 lletzius, F. 'Suec. p. 1-54 (1780) ; Mohr, Island. Naturh. p. 41 

 (1786); Cw. <S'. iV. i. p. 596 (1788); Lath. Lid. Orn. ii. p. 817 

 (1790); Bechsf. Natury. Deutschl. ii. p. 804 (1791); Meyer n. 

 Wolf, Taschenb. ii. p. 486 (1810) ; Temm. Man. d'Orn. p. 502 

 (1815); Meisner u. Schinz, Vliy. Schweiz, p. 275 (1815) ; Mei/er, 

 Vof/. Liv- u. Est hi. p. 236 (1815); Nilss. Orn. Suec. ii. p. "174 

 (1817); E. Sabine, Tr. Linn. Soc. xii. p. 519 (1819: Greenland); 

 Leach in J. Boss's Voy. Baffin Bay, App. ii. p. liii (1819 : 4to ed.) ; 

 Temm. Man. d'Orn. 2nd ed. p. 774 (1820) ; E. Sahine in Parry's 

 1st Voy. Sujip. p. ccv (1821: Davis Str.) ; Joseph Sabine in 

 Franklin's Polar Sea, App. p. 695 (1823 : Hudson Day) ; Brehm, 

 Lehrb. p. 705 (1824); /. C. Boss, in Parry's 3rd Voy. App. 

 p. 105 (1820 : Cliffs of N. Somerset Ld.) ; Vicill. Faunc Franq., 



VOL. XXV. X 



