ibises of the Genus Theristicus. 505 



(3) Theristicus branickii. 



1. Adult male, Pariayacu, Peru, 18 October, 1892 (./. 

 Kalinowski , Mus. Bei'lepsch, Specim. typicum). 



2. Adult male, Vallcvicioso, Paramo del Cotopaxi, July 

 {Dr. E. Festa) . 



3. Adult male, Vallevicioso, July {Dr. Festa). 



4. Adult male, Vallevicioso, July {Dr. Festa). 



5. Immature male, Vallevicioso, July {Dr. Festa). 



6. Adult female, Vallevicioso, July {Dr. Festa). 



7 & 8. Young specimens, Vallevicioso, July {Dr. Festa). 



Genus Theristicus Wagl. 



Type. 

 Theristicus Wagl. Isis, 1832, p. 1231 . Il)is melanopis Lath. 

 Wagler gives the following characters of the genus 

 Theristicus : — 



" Rostrum gracilius (quam iu genere Ibidis) ; pedes breves, 



robusti ; tarsus validus, digiti intermedii longitudine 



incluso hujus ungue, antice scutellis hexagonis tectus, 



postice reticulatus ; digiti validi, breviusculi, teretius- 



culi ; vnrjues mediocres, validi, arcuati, illi digiti 



anterioris intermedii acie interna subinflata (integra) ; 



acrodactyla elevato-scutellata. Ptilosis : lora ac stria 



utriuquc ad latus menti nuda ; ala et cauda prtelongai, 



ha3C cuneata, alas transceudens; pilei ac colli plumye 



longae, lacerae. Color prcedominans obscurus et dilutus, 



remiges et cauda metallici." 



Dr. Sharpe has recently given the characters of the different 



genera belonging to the family Ibididoi ; those of the genus 



Theristicus may be summarized as follows : — 



'^ Anterior aspect of tarsus reticulated, with numerous 

 hexagonal scales ; inner secondaries ordinary, not orna- 

 mented ; head feathered ; lores bai'c, no fleshy wattle on 

 centre of throat ; forehead feathered ; lores with some warty 

 papillae, region of eye bare ; sides of chin and upper throat 

 bare ; no crest of dependent feathers on nape/' 



To these characters those of the colouring may be added, 



■ being very similar in all the species. General colour slaty 



grey, head and neck whitish buif ; upper part of the head 



