South American Birds. 123 



Mackenzlena, gen. no v. 



Beichenbach, in 1850, proposed the generic name JSlsius, 

 and gave a figure in bis Av. Sysfc. Nat. Vog, pi. ixxi., which 

 lias been associated by previous authors with Thamnophilus 

 leachi, Such, as tiie type; but, when that bird is compared 

 with the figure, it will be easily seen that Reichenbach could 

 not have founded it on that species, as it is not anything like 

 it. The species was originally, and lias for many years been, 

 placed in the genus I'hamnophilus, Vieillot, where it was 

 equally out of place, as it is so entirely different from that 

 genus, which was founded on Lanius doliatus, Linn. I 

 propose, therefore, the new generic title Macketizicena, witli 

 the following characters : — Head not crested, no concealed 

 white dorsal patch, tail much longer than the wing. Bill 

 short and stout, the depth about two-thirds the length of the 

 exposed culmeiu The wing, which is rounded, has the fifth 

 primary longest. The tail is also rounded and much gradu- 

 ated, the two middle feathers longest. Coloration : the male 

 is black, with ovate white spots and bars to the feathers, and 

 the female is brown marked with buff. 



Type, M, leachi (Such). 



FEEDERICKENA, gen. nov. 



The species which I propose to separate as a new genus 

 under the above title has also been previously placed in the 

 genus r ThamnophiluSj Vieillot, with which it has no near 

 affinity ; it may be characterized by the absence of a concealed 

 white dorsal patch. The nuchal crest is composed of rather 

 broad feathers with rounded tips. The bill is short and stout, 

 the depth being equal to about one-half the length of the 

 exposed culnien. The wing is rounded, the fourth, fifth, and 

 sixth primaries longest and subequal ; the seventh is longer 

 than the third, but shorter than the fourth. The tail, which is 

 rounded and graduated, is about two-thirds the length of the 

 wing. s .The male is almost uniform in colour, but the female 

 has the tail and entire under surface barred. 



Type, Thamnophilus viridis, Vieillot. 



PlCROTES, nom. nov., pro Lochites, Cab. & Hein. 1859 

 (nee Gristel, 1848). 



Type, Lanius severus, Licht. 



SAKESPHORUS, nom. nov., pro Hypolophus, Cab. & Hein. 

 1859 (nee Miiller & Henle, 1837). 



Type, Lanius canadensis, Linn. 



