275 



The British Museum possesses hoth sexes of this fine, strong 

 Ant-thrush from collections lately transmitted bj Mr. Hates from 

 Ega, but originating, I believe, from further up the stream. I have 

 a single male specimen from the same source. The female has so 

 nearly the same general appearance as Thamnopkilv* hyperythrus 6 , 

 that they might easily be confounded at first sight. 



2. Myrmelastes nigerrimus, sp. nov. 



Unicolor niyerrimus, tectricibus alarum superioribus, campterio 

 j>roximis, albis. 



Long, tota 6*5, alae 3*3, caudse 2 - 3, tarsi 1*3. 



Hah. Upper Amazon (Bates). 



Mus. Brit. 



A single example of this bird occurred in the same collection as 

 the former species, and is now in the British Museum. It is quite 

 the same form as Myrmelastes plumbeus, with the exception of the 

 bill being slightly shorter and the feet rather stronger. It is marked 

 " Irides black, bill black." It is without doubt a male ; and it will 

 be interesting to see the female. 



Genus IV. Rhopoterpe. 

 Rhopoterpe, Cab. Orn. Not. in Wiegm. Arch. 1847, p. 227. 



Rostrum rectum, validum, elonyatum : alee elonyatce, retnige 



tertio quartern quintum et sextum subcequante : tarsi validi sect 



breves; acrotarsiis divisis. 



This peculiar bird must come near Formicarius, but is at once 



distinguishable by its long wings and short tarsi. The two other 



species placed by Cabanis in this genus seem to me to have nothing 



to do with it. See Myrmotherula yularis and M. guttata. 



1. Rhopoterpe torquata. 



he Fourmillier de Cayenne, Buff. PI. Enl. 700. fig. 1. 



Formicarius torquatus, Bodd. Table d. PI. Enl. 



Tardus formicirorus, Gm. S. N. i. p. 828. 



Myrmothera formicivora, Vieill. Enc. Meth. p. 782. 



Myioturdus palikour, Men. Bfon. Myioth. p. 470. 



Formicarius torquatus, Gray, Gen. i. p. 21 1. 



Rhopoterpi formicivora, Cab. Orn. Not. p. 228; Bp. Consp. p. 200. 



cj . Cinnamomeo-brunnea, dorse niffro maculato ; alts maris pal- 

 lido cinnamomeo trifaseiatis : subtus cin ere a , gutture <■/ pectore 

 antico nigris ; ventre medio nigra transversim radiato. 



9 . Gutture ct pectore antico ferrugim is. 



Long, tota 5*5, alee 3-7, caudce I- 1, rostii a rictn in.., tarsi 



1 1 id), ('avenue. 

 Mas. K.it., P. L. S. 



