6G6 Letters, Extracts, and Notes, 



Errata to the first part of Mr. Sioynnerton's paper " On the 

 Coloration of the Mouths and Eggs of Birds " (pp. 261- 

 294). — Mr. Swynnerton writes : "I take this opportunity to 

 correct a few somewhat important errors, due mainly to my 

 illegible writing, that appeared in the first part of my paper 

 (April, 1916, pp. 264-294). The omission of a passage 

 accounts for one or two minor discrepancies, also for the 

 mistake over Phrynocephalus mystaceus, one of several lizards 

 that display bright mouth-colours when at bay, after the 

 manner of an adult bird. 



Page 266, line 28. For "the lizard Phrynocephalus mystaceus" read 



simply " lizards." 

 „ 271, „ 14. „ "alone. It is in virtue of this that" read 



" alone, in virtue of which." 

 „ 273, „ 17. „ " common groups " read '' colour-groups." 

 „ 273, „ 18. „ " memory and simplification " read " memory- 

 simplification." 

 „ 274, „ 17. „ " direction " read '' directive." 

 „ 277, lines 25-35. All in inverted commas (B. 0, C. Bull. xxxv. 



p. 108). 

 " 280, „ 3-4. For " mouths " read " these mouths." For "often" 



read " in any case often.'' 

 „ 281, line 38 (last). Omit "or," 

 „ 282, lines 15-16. Omit <' thus " and for " for " read " by the fact 



that." 

 „ 285, line 32. For "less strongly, as did" read "as did, less 



strongly." 

 ,, 292, „ 16. „ "contingent" read "countera gent." 

 „ 294. Fig. 34 is Laniarius manninyi. Fig. 41 is Trochocercus 

 bivittatus Rchw. * 



Three points in the Plate (p. 264, pi. vii.) may be 

 mentioned. The twin spots in Chloropeta (fig. 9) do not, 

 I think, in life slope in to the extent shown here (and quite 

 likely in my own sketch); the dusky area of the tongue of 

 Pycnonotus (fig. 15) is not seen at all during the action 

 of ' waggling ' that accompanies a demand for food, and 



* The species described by myself as T. megalolophus (Bull. B. 0. C. 

 xix. p. 109, figured ' Ibis,' 1908, p. 96) proves actually to be this species 

 of Dr. Reichenow's. 



