CYCLORHIS. 385 



characters, is very similar to that of Falcunculus (of the Laniada:) 

 of Australia, which it also resembles so much in other characters as 

 usually to induce authors to bring the two together, either as ad- 

 jacent genera, or as belonging to closely allied subfamilies. 



The difference generically between Cyclorhis and Vireolanius is 

 very slight, and I cannot find any real ground of separation. In 

 the latter the bill is perhaps lower and proportionally more elongated ; 

 the culmen less curved ; the tip longer and more curved, although C. 

 nigrirostris differs from the other species of Cyclorhis in just these 

 characters. The nostrils are perhaps more circular and smaller in 

 Cyclorhis. The colors differ somewhat — the prevailing tints in 

 Cyclorhis being olive green and dull yellow, as in the Vireos, while 

 in Vireolanius they are deep verdigris green, bright blue and clear 

 yellow (white below in type). If we were to limit Vireolanius to 

 the type — melitophrys — the difference would be rather more appre- 

 ciable. For the present, however, I keep the two groups separate. 



Although most of the species of the two genera are strictly 

 South American, I yet give all in detail, in order to furnish a com- 

 plete monograph of the family of Vireonidae. 



Common Characters. — Above plain olive green; lower throat (sometimes 

 breast, or whole under parts), axillars, inner face of wings, and inner edges 

 of quills yellowish ; rest of under parts whitish. A rufous band from 

 nostrils over eye to nape, sometimes only to eye. Chin, and more or less 

 of cheeks, ashy. Head above ashy, more or less pure, rarely like the back. 

 Lower mandible in most species plumbeous black. 



A. Head above and nape, with the entire cheeks, ash color ; 



the former sometimes glossed with ochraceous. \ 



Legs flesh color. Throat, jugulum, and breast yel- ' 

 low. 



Entire under parts (except chin) yellow , flaviventris.^ 

 Beneath yellow ; middle of belly to crissum 

 whitish. 



Yellow more extended, with decided 



olivaceous green tinge across the 



— breast. Cheeks dark ash . . suhjiavescens. 



Yellow of breast more restricted, and 



scarcely olivaceous. Cheeks light 



ash ...... fiavipectus. 



Legs dusky plumbeous. Lower throat and sides of 

 breast yellowish. 



Superciliary rufous extending to nape. Lower 

 mandible plumbeous at base. 



' Specimens from Guatemala lack the black spot of bill. 

 25 May, 1866. 



