Museums of the United States. 317 



Myrmotherula albigula, Lawr. Ann. Lye. N. Y. viii. 

 p. 131 (18G5), was described from a specimen, which I 

 take to be a female of M. melana, Scl. {vide supra, p. 311). 



Myrmelastes corvinus, Lawr. Ibis, 1863_, p. 182. 



This appears to me to be Gymnocichla nudiceps. The sole 

 difference between the supposed species is that one has the 

 head feathered where the other is bare ; and it seems to me 

 most probable that the feathers fall from the head of G. nu- 

 diceps as the males advance towards maturity. We have long 

 had specimens in our collections of M. corvinus, which I had 

 always believed to be G. nudiceps with the head feathered. 

 I still consider this the correct view. 



Chloronerpes callopterus, Lawr. Ann. Lye. N. Y. vii. 

 p. 476 (1862). 



In describing the species of this genus from Veragua which 

 I called C. simplex (P.Z.S. 1870, p. 212), I stated the differ- 

 ences that appeared to exist between it and C callopterus. I 

 now find these confirmed, the more so as Mr. Lawrence^s type, 

 instead of being a male, is a female, the same sex as the spe- 

 cimen I described. Moreover, in a collection recently received 

 in the Smithsonian Institution, there is a skin of a male of C. 

 simplex, collected by M. Zeledon during Prof. Gabb's expe- 

 dition to Talamanca. I am therefore now able to complete 

 the description of my species, and record with certainty the 

 differences which exist between it and C. callopterus. 



Chloronerpes simplex. 



cj (Smiths. Inst. No. 64865) . Oleagineo-virescens : gula, 

 pectore et rcgione auriculari paulo obscurioribus : fronte, pileo 

 toto, nucha et macula rictali elongata rubris : pectore ochra- 

 cescente albido gi;ttato ; abdoraine pallide ochracescenti- 

 albido, fusco transfasciato : alis intus castaueis, extus dorso 

 concoloribus : primariorum et secundariorum apicibus nigris, 

 remigibus omnibus nigro transfasciatis : cauda fusco-nigra, 

 extus dorso concolori : tectricibus subalaribus castaneis : 

 rostro et pedibus plumbeis : long. tot. 70, alse 4*5, caudae 2*6, 

 rostri a rictu 1*0, tarsi 0'7. 



