32 



ORTHOGENETIC EVOLUTION IN PIGEONS. 



Explanation of Plate 10. 



Left wing of aduit stock-dove, Columba anas, No. 2. x 0.9. Hayashi del., Dec. 1904. The bars 

 of both wings shown in figure B. 



One of three adult stock-doves captured by Mr. Lane, of Cambridge, England. 



In the figures the first of the tertials has been omitted. It is now present in the bird (Mar. 12, 1005) This 

 feather readies as far back as the longest scapulars, and hence to distal edge of the spot on the second feather, but 

 it covers only the upper (inner) third of the spot. 



The first bar is very pale — about half as dark as second bar; it appears too black in ink. 

 On the right side only two spots were found. 



Second bar. 



Feather No. 1, omitted in figure 1 (correct in fig. B). 



No. 2, shows mere trace of spot; would not be noticed. 



No. 3, spot middle of lower web, roundish, 9 mm. long, usually entirely covered; distance to tip, 13 mm. 



No. 4, spot about 14 mm. long, only 2 mm. exposed; distance to tip, 14 mm. 



No. 5, spot about 11 mm. diameter, only 2 mm. exposed; distance to tip, 18 mm. 



Measurements of third bar. 



Two minute rudiments, wholly covered; upper one occurs on fifth feather of row; distinct but not sharply out- 

 lined, 5 mm. long by 2.5 mm. wide; 13 mm. distant from tip; lower one a very thin freckle of about same size as upper; 

 would be overlooked if one were not guided by the upper spot. 



Explanation of Plate 11. 



Left wing and bars of both wings of adult stock-dove, Columba asnas. No. 3. x 0.9. Hayashi 

 del., Nov. 1904. One of three adult birds from Mr. Lane. 



The first tertial is not shown in figure A; correctly shown in figure B. No upper spot in either bar. The distal 

 side of all spots straight-slant in both bars; proximafend rounded in all spots of both bars. The first bar has three 

 weak spots. Ink makes them too strong. They are so faded that at certain angles they almost vanish. In the fon rt h 

 feather is found the strongest of the three spots. 



Third bar has four spots, all concealed; they lie on fourth, fifth, sixth, and seventh feathers; are rounded remnants, 

 with distance from tip varying from 14 to 20 mm.; second and third spots strongest, first and last much weaker. 



