vor,. xvi,"] 

 lHV.i. J 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



499 



from South America, a Cayenne female. His descriptioii has reference 

 only to tlie female, and when aiiplied to the male the differences pointed 

 out by him are somewhat misleading, as in the latter the chief dissim- 

 ilarity is observed on the under parts. Since that time the National 

 Museum has acquired four males from Diamantina, Brazil, and others 

 of both sexes, from I^icaragua and Costa Rica. A careful examination 

 of this series leads me to believe that the northern birds are easily sep- 

 arable from the Scmth American ones. 



Granting that the Cayenne female is a typical one of the South Ameri- 

 can form, and I have reason to think it is, the dift'erence between it and 

 the Central American birds is at once apparent. The bars on the upper 

 parts are much narrower and paler than in the latter, and, while the 

 under parts are nearly the same as regards width of bars, there is a 

 very strong suffusion of buff in the Central American examples. In 

 males the difference between the bars on the upper parts is hardly dis- 

 tinguishable, but tliere is a decided difference below, the black and 

 white spaces l)eing considerably wider in fasciatus. The statement 

 made in Biologia Centruli- Americana, Aves, ii, 195, that the variation 

 in the widtli of the white bands is probaldy due to age, the birds with 

 narrower bands being the older, is disim)ved by two males from Dia- 

 mantina, in which the wings are similar in color to those of the female, 

 a mark of immaturity. These birds differ in no way from the other 

 Diamantina males as regards barring of the under parts. There is a 

 ditierence in size alone sufficient to Avarrant the separation of the two 

 forms, as an examination of the following table Avill show : 



CYMBILANIUS LINEATUS. 



CYMBILANIUS LINEATUS FASCIATUS. 



91251 



128:!38 



1283:{9 



4103 



4295 



4408 



126320 



91840 



64769 



34775 



45615 



!ll'_'!i2 



1-.'S:!40 



128341 



4467 



4.')38 



116345 



64770 



34774 



.".38(17 



Iris 



S. N. M 



do 



do 



W.R... 



do 



.do 



S.N.M 

 .do 



.do 

 .do 

 .do 

 .do 

 .do 

 .do 

 .do 

 W 



.do 



. S. N. M 



-do 



.do 



.do 



R. 



Type. Los Siilialos, Nicaragua. 

 Escondido Uiver. Nicaragua ... 



do 



do 



do 



do 



Hio Frio. Co.sta Rica 



Rio Siicio, Costa Rica. 



Sipnrio. Cost a Rica , ,^ 



Ango.stnra, Costa Rica 



Sfa. Fc, Vfiagua 



Panama 



Type. Lo« Sabalos. Nicaragua 



Escondido River, Nicaragua 



do 



do 



do 



Nicaragua 



Sipurio, (/'osta Rica 



Angostura, ( 'osta Rica 



Panama 



2.72 

 2.77 

 2.78 

 2.80 

 2.65 

 2.77 

 2.67 

 2.71 

 2. 70 

 2.66 

 2.75 

 2.82 

 2.72 

 2.82 

 2.77 

 2.75 

 2.93 

 2.76 

 2.81 

 2,87 

 2. 75 



carmine. 



