CAM I'Y I-OIUI YNCHU8. 



97 



Thoro aro Homc points of (liHerciice in diBV-ront proups of Camjnj- 

 hirh'iitvhMti in tlit' clianiclcr of the noHlrils and some otiiiT It'iilurcs. 

 Ill tli(! type, HH iTiniirixwl, tiiu nasul wcalo is reducLMl to a nu'iv ridgo 

 (111 till) upper sido of tlie nasul groove — the cavity being oval, lu 

 jiicoHm it is alniilar, with tho cavity more liiu-ur. In innjalojjtrrait, 

 nnialus, bruniieicujnllus, and their allies, the scale is more developed, 

 us in tropical Wrens. In C. rapidrulux, rujinurha, huiiuii)i,vlc., the 

 nostril is more like Jtonacolnus and IlfleodijlcH, namely, at the an- 

 terior end of the nasal groove, bordered behind by membrane, and 

 not above. In these the tail ia shorter and less graduated than in 

 the tvpe. C. capitflratuH is placed by Cabunis under Jleleodi/fex, on 

 account of its i)ecnliarities of nostril ; it differs, however, in .'shorter 

 (uil, siiorter bill, weaker legs, and the middle toe shorter than thu 

 tarsus, not longer. 



The followiii!' table exhibits the peculiarities of the species before 

 luo in reference to the nostrila : — 



A. Nostrils rather linear, liorizontal, in lower side of nasal groove, and over- 



hung broadly hy uie-'ibraue thickened at edges : C. hrunHeicdpillus, uffiuis, 

 ixilltscens, baltetitus, mfi.yiilopterus, zoiuitns, purdus. 



B. Nostrils more oval, the overhanging men^brane reduced to a ridge on tipper 



edge of nasal groove : C. vurie</atus, brevirustria, zonutoidtSyjocosuit (nodtriLs 

 more linear), albibrunneua, 



C. Nostrils as in Ileleodijtes ; broadly oval or rounded, in anterior end of nasal 



groove, with thin membrane behind : C. capiatrutuK, rujinucha, humilis. 



The transition, however, from one to another form, is vf "y gradual, 

 (inil it is quite diflBcult to say, in regard to some species, whether they 

 belong more properly to one secti«m or to another. Without more 

 specimens therefore at my command, I prefer to consider all as 

 identical gencrically. 



The following fynop' is may aid in determining the Middle Ameri- 

 can species, and their nearest S. American allies, by their colors : — 



TvV^^r^^ 



A. Upper parts uniformly brown, without bands or spots. 



Head and neck with whole under parts white 



B. Top of head and post-ocular stripe reddish-brown ; back 



streaked longitudinally and linearly with white. All the 

 feathers beneath conspicuously spotted. Crissum and 

 flanks with rounded or elongated spots. Nostrils in- 

 ferior, linear, overhung by a scale. 

 a. Spots much larger on throat and jugulum than 

 elsewhere. Inner webs of 2d-.'jth tail feathers 

 (betweea middle and outer feathers) black, except 



at tips 



7 August, 1864. 



C. albibTunneus. 



bruniieicapillus^ 



.* ■■ 



