G08 



MR. R. B. SHARl'E ON THE CUC'ULID.E 



[June 1 7, 



another striking instance of mimicry — perhaps the most perfect 

 in the whole class of birds. 



Genus 13. Sericosomus. 



Sei-isomus (lege Sericosomus), Sw. Classif. B. ii. Type. 

 p. 323 (1857) iS. cristatus. 



Coua*, auct. (nee Cuvier). 



Glaucococcyx, Cab. & Heine, Mus. Hein, Th. iv. 

 p. 71 ( 18G2) S. caruleus. 



Fig. 17. 



Head of Sericosomus ccsrufei/.i. 



Fig. 18. 



Head and foot of Cocklothraustes dclalandi. 



* Cuvier. to whom the establishment of this well-known and long-used name 

 has been credited, never used it as a genus (cf. Eegne An. i. p. 425). I cannot 

 separate Glaucococcyx of Cabanis and Heine, as the type (G. cesrufms), though 

 aberrant in coloration, seems to be a typical species as regards structure. 



