404 ADDENDA. 



n page 119. Line 12, for black, read blacMsh. 



On page 131. Lines 21 and 22, read four timcs^ 

 instead of thrice and three times. 



Page 154. The females of Colymbus torquatus and 

 of some other swimming birds, lack the head markings 

 described in the text, and are dull or streaky. 



Page 155. The occurrence of Podiceps cristatus in 

 America at all, is lately denied by Dr. Brewer. 



To page 219, after Pleurolepis pellucidus, add : 



2. P. asprellus, Jordan. ROUGH SAND DARTER. Form 

 of P . pellucidus, but the squamation much more com- 

 plete, and the scales rougher; sides, back and breast 

 with imbricate scales; size larger and colors darker than 

 in pellucidus; fins high; D. IX 10; A. I., 8, lat. 1. 98. 

 Sandy streams in Illinois. " Has in life all the colors 

 of the rainbow." (P. pellucidus has normally but one 

 anal spine, instead of two, as stated in the text.) 



3. P. vitreus, (Cope) Jordan and Copeland. GLASSY 

 DARTER. A species apparently similar to the last, but 

 with smaller fins, and much larger scales; D. VII 14, 

 A. II, 9; lat. 1. 56. North Carolina. 



On page 227, after P.jessice, add: 



4. P. asprigenis, Forbes. ROUGH-CHEEKED DARTER. 

 Short and stout ; cheeks and opercles entirely scaly ; 

 scales large; lateral line about to end of second dorsal; 

 spines high ; coloration apparently as in variatus ; 

 spinous dorsal dusky behind; D. XII 13; A. II, 8; lat. 

 1. 48. Illinois River. 



On page 229, after B. eos, add: 



4. B. elegans, Grd. ELEGANT DARTER. Short, 

 chubby and compressed ; depth 4 in length ; head 3f ; 



