Plumbeous Ibis

Here the details of the Plumbeous Ibis named bird below:

SCI Name:  Theristicus caerulescens
Protonym:  Ibis coerulescens Nouv.Dict.Hist.Nat. 16 p.18
Taxonomy:  Pelecaniformes / Threskiornithidae / Theristicus
Taxonomy Code:  pluibi1
Type Locality:  Paraguay.
Author:  Vieillot
Publish Year:  1817
IUCN Status:  Least Concern

DEFINITIONS

THERISTICUS
(Threskiornithidae; Ϯ Black-faced Ibis T. melanopis) Gr. θεριστικος theristikos  of reaping  < θεριστρον theristron  sickle; "Genus. Theristicus Wagl.,  Curucou.   Rostrum gracilius. Pedes breves, robusti; tarsus validus digiti intermedii longitudine, incluso huius ungue, antice scutellis hexagonis tectus, postice reticulatus; digiti validi, breviusculi, teretiusculi, ungues mediocres, validi,arcuati, ille digiti anterioris intermedii acie interna subinflata (integra); acrodactyla elevato-scutellata.  ...  Species: 1. Th. melanopis (Ibis melanop. Wagl. Syst. Av. sp. 17.)" (Wagler 1832); "Theristicus Wagler, Isis, 1832, col. 1231. Type, by monotypy, Tantalus melanopis Gmelin." (Peters 1931, I, 135).  
Var. Theristocus.
Synon. Harpiprion, Molybdophanes.

caerulescens
Unattested L. caerulescens, caerulescentis  bluish (neither caerulescere nor caerulescens have been found in Classical Latin, but their existence may be inferred from caeruleus  azure-blue, by the example, amongst others, of rufus  red, ruddy, giving rufescere  to become reddish, and rufescens  reddish).
● "61. ANAS.  ...  cærulescens.  10. A. grisea, subtus alba, tectricibus alarum dorsoque postico cærulescentibus.  Anser canadensis, alis cæruleis. Edw. av. 152. t. 152.  Habitat in Canada." (Linnaeus 1758) (Anser).
● "43. LANIUS.  ...  cærulescens.  8. L. cauda forficata, corpore nigro cærulescente, abdomine albo.  Lanius cauda forcipata. Edv. av. 96. t. 56.  Habitat in Benghala." (Linnaeus 1758) (Dicrurus).
● ex “Héron bleuâtre de Cayenne” of d’Aubenton 1765-1781, “Crabier bleu à cou brun” of de Buffon 1770-1785, and “Blue Heron” of Latham 1785 (syn. Egretta caerulea).
● ex “Blue Roller” of Latham 1785 (syn. Eurystomus glaucurus).
● "41. FALCO.  ...  cærulescens.  7. F. cera palpebris pedibus subtusque luteus, dorso nigro-cærulescente, temporibus linea alba inclusis.  Accipiter minimus benghalensis. Edv. av. 108. t. 108.  Habitat in Asia." (Linnaeus 1758). This epithet is the thirteenth name in avian nomenclature. (Microhierax).
● ex "Oiseau bleu" of Dubois 1671, and "Gros oiseau" of Brown 1724 (‡Porphyrio).
● ex “Blue-necked Rail” of Latham 1785 (Rallus).
● ex "Fauvette bleuâtre de S. Domingue" of de Buffon 1770-1783, and "Blue-grey Warbler" of Latham 1783 (Setophaga).
● ex “Batara negro y aplomado” of de Azara 1802-1805, no. 213 (Thamnophilus).
● ex “Caerulean Creeper” of Latham 1801 (syn. Zosterops lateralis).