( 255 ) 



The first author to use the adjective pavoniiius in comliination with 

 Pteroglossus was api)areiitly Wagler;* but his excellent descrij)tion — taken from 

 a single bird from Valle Real, Mexico, in the Berlin Museum — leaves no doubt 

 as to its being referable to Aulacorhynchus prasinus auct. In fact, Gould, four 

 years later, founded his Pteroylossus prasinus (Lichtenstein MS.) t on the very 

 same sjiecimen in the Berlin Collection I 



However, in spite of its undoubted priority, paeoninns (1829) cannot replace 

 prasinus (1833), for Wagler evidently had no intention of creating a new name 

 of his own, but merely employed Gmelin's old terra. % 



Ramphastos pavoniniis Gmelin § is described as " R. viridis, pennis rubris et 

 pavoninis hinc inde interspersis," and refers, no doubt, to some artefact. 

 Consequently, this name should be altogether disregarded. The nomenclature 

 of the two green Mexican Toucans stands, therefore, as follows : 



(a) Aulacorhijnchus prasinus prasinus (Gould). 



Pteroglossus j/avoninus (nee Gmelia) Wagler, Isis, 1829, p. 507 (Mexico, Valle Real : specimen 



in Museo Berolin. decembri occisum). 

 Pteroglossus prasinus (e.x Licbteiistein MS.) Gould, Moiiogr. Ramph. (1st edit.), part i, [ilate 



(1833. — spec, uaicum iu Mus. Beiolin.). 



(i) Aulacor/ti/nehus prasinus wagleri (Sturm). 



Pteroglossus puroiiinits (nee Wagler) Gould, Monogr. Ramph. (1st edit.), part iii, plate (1835. — 

 specimen in Mus. Monacense) ; idem, P.Z.S. 1835, p. 158 (Mus. Munich). 



Pteroglossus iragleri Sturm, Monogr. Rhamph. Heft 2, tab. [6] (1841. — Mexico; Mus Monae.). 



Auhc'orhumphus umghrl Sclater, P.Z.S. 1859. p. 388 (Xacatepec, Oaxaca, S.W. Mexico); idem, 

 Cut. B. Brit. ilus. xix. 1891. p. 157. 



Aulacorltamphus pavoniuus (errore) Salvin & Godman, Ibis^ 18^9, p. 210 (Amula, Sierra Madre 

 del Sul, Guerrero, Western Mexico). 



This western form differs from A. p.- prasinus in its dull yellowish frontal 

 band and oily-green crown ; by lacking the narrow, pale bluish green superciliary 

 streak ; and by having the black patch at the base of the culmeu confluent with 

 the black stripe along the maxillary tomium. Besides the type, the Zoological 

 Museum at Munich po.ssesses a second adult specimen, both without any further 

 indication than " Mexico." The wing measures 128-129, the tail 125-127, the 

 bill 75 — 77i mm. 



.1. p. loayUri appears to be very rare in collections. The late A. Boucard 

 obtained an e.Kamj>le at Xacatepec in Oaxaca, Mrs. H. H. Smith another in the 

 Sierra Madre del Sul, state of Guerrero. Additional specimens doubtless exist 

 in .American museums. 



The following species are discussed in Part II. of this paper: 



T. coratja and its laces ............ p. 227 



T. ridgmaiji Berl. 'j 



T. corayii herleimchi Brab. k Chublj ™, , . ■ , ,t \ n-,r. 



■r • ., -1 . . • i> , . r = Thri/othonts corai/a (/nseigula (Liiwr.) . p. 229 



J. oija/iocensis itwwisciensis Brab. &l •' j j j \ / r 



C'hubb J 



• hU, 1829, p. 507. 



t M^ouiijr. Humph. (Ist ud.), Tart i. 1SH3. 

 X 8.ie Wa;<l(:r's remark : ^^ Jiampluis'os paiun'mits auctor." 



§ HjiMt. JVttt. 1, i. p. ;).■);! (I78S— ex " Le T.nican venl du Mexifjuc," r.risson, Oni. iv. p. 423: ox 

 " Xucliitcnacall,'' Fernandez, ///»(. noe. limp. p. 51, tab. clxxxvii.). 



