30 SCANSOKES. 



1. PICOIDES TRIDACTYLTJS. The Northern Three-toed 

 Woodpecker. 



Picus tridactylus, Linn. Fauna Suec. p. 103. 



Dryobates tridactylus, Boie, Isis (1828), p. 326. 



Dendrocopus tridactylus, Koch, Baier. Zool. p. 74. 



Tridactylia hirsuta, *Steph. Gen. Zool. ix. p. 219. 



Picoides tridactylus, Lacep. Mem. de TInstit. 



Picoides (Apternus) tridactylus, Bp. Ateneo Ital. (1854) p. 



Picus hirsutus, Vieill. Ois. d'Amer. Sept. i. 124. 



Picoides variegatus, Valenc. Diet. Sci. Nat. xl. p. 191. 



Picoides europseus, Less. Tr. d'Orn. p. 217; Malh. Monogr. des 



Pic. p. 170, t. 38. f. 1, 2, 3. 

 Apternus tridactylus, Sw. Class, of B. ii. p. 306. 

 Picoides longirostris, septentrionalis, montanus et alpinus, 



Brehm. 



a, b. Russia, male and female. From the Moscow Museum. 

 Cj d. North Bothnia, male and female. 



2. PICOIDES CRISSOLEUCTJS. The White-thighed Woodpecker. 



Picus crissoleucus, Brandt, MS. 



Apternus Kamtschatkensis, Bp. MS. 



Picus tridactylus, Pall. Zoogr. i. p. 415. 



Picoides (Apternus) crissoleucos, Bp. Ateneo Ital. (1854) p. 



Apternus crissoleucus, Rchb. Syn. p. 362. 



Picoides crissoleucus, Malh. Monogr. desPic. p. 180, t.40. f. 1, 2, 5. 



Picus tridactylus, var. orientalis, Sundev. 



Hob. Kamtschatka, Siberia, Ural Mountains, Amur. 



3. PICOIDES AMERICANTJS. The Banded Three-toed 

 Woodpecker. 



Picus (Apternus) tridactylus, Sw. Fauna B.A. ii. p. 311, pi. 56. 



Picus (Apternus) americanus, Sw. Classif. of B. ii. p. 306. 



Picus tridactylus, Bp. Syn. of B. U. S. p. 46. 



Picus hirsutus, Vieill., Wagl. Syst. Av. ; Bp. Consp. Av. i. p. 139. 



Picoides hirsutus, G. R. Gr. Gen. of B. ii. p. 434. 



Picus arcticus, Dekay, Nat. Hist. New York, p. 190, pi. 17. f. 36. 



Picoides (Apternus) hirsutus, Bp. Ateneo Ital. (1854) p. 



Picoides americanus, Brehm, Vollst. Vogelf. p. 71; Malh. Monogr. 



des Pic. p. 176, t. 39. f. 1, 2. 



Picus undulatus, Vieill. Ois. Amer. Sept. ii. p. 69. 

 Tridactylia undulata, Steph. Gen. Zool. ix. p. 220. 

 Picus undosus, Cuv. Eegn. An. (1829) p. 451 ; PL Enl 553. 



