( S8 ) 

 40. Amblycercus solitarius solitarius (Vieill.). 



Ci/sf/ciis .lolitarhi!) Vieillot, A^miv. Dvt. v. p. 3C4 (181fi. — ex Azara, no. 58 : Paraguay = juv.). 

 Cassindus solitarius Pelzeln, l:r. p. 194 (Porto do Rio Araguay). 



No. 2411. ? ad., Rio Araguaya, August 1900.— AVing 114; tail 110; bill 

 28 mm. 



Bill yellowish white, basal half greyish. 



50. Cassidix oryzivora oryzivora ((^m.). 



Oriiilus nrijzirorus Gmelin, Sysl. Nut. 1. i. p. 38G (1788.— ex Latham; Cayenne). 



No. 2387. ¥ ad., Rio Araguaya, August 1906. 



There are doubtless two (or more) geographic races of the Rice-Gracl;k' in 

 South America, but I liave no time now to enter into the question. 



51. Molothrus bonariensis bonariensis (Gni.). 



Tiiiiarira boiiaritiisis Gmelin, Si/sl. Xiil.J. ii. p. 898 (17SS, — " Bonaria " — ex Daulienton, /■?, c;//. 710), 

 Molothnt.i sericeus (nee Irlerus i^erireiis Lichtenstein) Pelzeln, Ix, p. 'JOO (Goiaz). 



No. 2328. ? ad. (au c? jr.?), Rio Araguaya, July 1900.— Wing Ion ; tail 74 ; 

 bill 10 mm. 



Agrees with speeimens from Buenos Ayres, Rio Grande do 8ul, S. Paulo, etc. 

 Of. Abhandl. Akad. Wissensc/i. Miinchen, Kl. II. I5d. xxii. 3. 1900. pp. 013-14. 



52. Xanthornus cayanensis valencio-buenoi (Ihering). 



\Oii"his riii/inteiisia Linnaeua, Syst. Nat. xii. 1. p. IG.'? (17GC. — ex Edwards and Brisson : " in insula 

 St. Thomae (errore !), Cayana " — the latter locality accepted as terra typica).] 



Jctenis rtn/a/icnsis calrnriii-bueuni Ihering, lievisl. Mux. Paul. v. for 1901, p. 2G8 (1902. — Piracicaba 

 and J.iboticabal, N.E. S. Paulo). 



llyiihiittis iijjrrhiipleriis (nec Vieillot !) Pelzeln, Ziir Ornilh. Bras. iii. 18G9, p. 194 (part.: Porto do 

 Rio Parana, Goiaz, Cuyaba). 



Nos. 2037, 2103. ? ? ad., Goyaz, April and May. — Wing 91, 93 ; tail 99, 101 ; 

 bill 19, 20i mm. 



Nos. 2101, 2102, 2035, c? fere ad., c? jr., ? juv., Goyaz, April and May.— 

 Wing 04, 88, 89 ; tail lOOi, 91, 102 ; bill 20—19 mm. 



No. 1059, vix adult, Esperanca, 7((0 m., Dec. 19o5.— Wing 91; tail 95i ; 

 bill 20i mm. 



The series agrees perfectly with several examples from northern S. Paulo : 

 one ? ad. from Victoria, coll. Ilempel iu the Tring Museum, and a jiair from 

 Porto do Rio Parana, collected by Natterer, and belonging to the Vienna Museum. 

 Besides these, there are among Nattcrer's specimens an adult female and a young 

 bird from Cuyaba, Mattogrosso, which I am unable to distinguish from our 

 Goyaz series. In the same locality (Cuyaba), this naturalist also obtained 

 four adult birds of X. pijn-hoptcrus comj/.fiis (Oberh.)* in which the shoulder- 

 patch is of a clear cinnamon rufous. 



A', c. valencio-buenoi is an excellent form, to some extent intermediate between 

 A', c. car/ancnsis and X. c. tihialis Sws. With the former it agrees in having 

 the thighs black, and the axillaries as well as tlie uuder wing-coverts black, 

 narrowly edged with jialc yellow; but dill'ors at a glance by the humoral patch 



• rrof. f'.'S'. ifnt. Mils. .xx\. 10112. p.C8 ((.'ii^aba, Mattogrosso), 



