118 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



643. Betula beatriciana Lesquereux. Types. 



745. Dakota (Cret.). Near Beatrice, Nebraska. 



Lesquereux, Amer. Journ. Sci., XLVI, 1868, p. 95; Rept. U. S. 

 Geol. Surv. Terr., VI, Pt. I, 1874, p. 61, pi. 5, fig.5; pi. 30, fig. 4. 



8485. Betula bendirei Knowlton. Type. 



Upper Eocene (Tert.). Bridge Creek, Crook County, 

 Oregon. 



Knowlton, Bull. No. 204, U. S. Geol. Surv., 1902, p. 40, pi. 4, fig. 2. 



159. Betula caudata Goeppert. Types. 



160. L,aramie? (Cret.). Evanston, Wyoming. 



Lesquereux, Ann. Rept. U. S. Geol. Surv. Terr., 1871 [1872], p. 293. 



= Betula stevensoni. 



See Betula goepperti and Alnus americana. 



5366. Betula coryloides Ward. Type. 



Fort Union (Tert.). Seven Mile Creek, below Glendive, 

 Montana. 

 Ward, Bull. No. 37, U. S. Geol. Surv., 1887, p. 31, pi. 14, fig. 3. 



8535. Betula ? dayana Knowlton. Type. 



Mascall beds, Miocene (Tert.). Twelve miles west of 

 Mount Vernon, Grant County, Oregon. 

 Knowlton, Bull. No. 204, U. S. Geol. Surv., 1902, p. 41, pi. 4, fig. 4. 



1670. Betula florissanti Uesquereux. Type. 



Green River (Tert.). Florissant, Colorado. 



Lesquereux, Rept. U. S. Geol. Surv. Terr., VIII, Pt. Ill, 1883, p. 

 150, pi. 27, fig. 11. 



159. Betula goepperti Lesquereux. Types. 



160. Laramie? (Cret.). Evanston, Wyoming. 



Lesquereux, Rept. U. S. Geol. Surv. Terr., VII, Pt. II, 1878, p. 138, 

 pi. 17, figs. 22, 23. 



= Betula stevensoni. 



See Betula caudata (?) and Alnus americana. 



158. Betula gracilis ? Ludwig. Illustrated specimen. 



Denver (Cret.). Golden, Colorado. 



Lesquereux, Rept. U. S. Geol. Surv. Terr., VII, Pt. II, 1878, p. 138, 

 pi. 17, fig. 20. 



7058b. Betula heterodonta Newberry. Types. 



7071 Upper Eocene (Tert.). Bridge Creek, Crook Count}', 



to Oregon. 



7°73- Newberry, Proc. U. S. Nat. Mus., V, 1883, p. 508; Mon. XXXV, 



U. S. Geol. Surv., 1898, p. 64, pi. 44, figs. 1-3; pi. 45, fig. 6. 



7047. Betula heteromorpha Knowlton. Types. 



7052. Upper Eocene (Tert.). Bridge Creek, Crook County, 



7060. Oregon. 



Knowlton, Bull. No. 204, U. S. Geol. Surv. , 1902, p. 39. 



See Populus polymorpha. 



