Museums of the United States. 
317 
Myrmotherula albigula, Lawr. Ann. Lyc. N. Y. viii. 
p. 131 (1865), was described from a specimen, which I 
take to be a female of M. melcena , 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. Lyc. 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. Gab Vs 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. 
(Smiths. Inst. No. 64865). Oleagineo-virescens : gula, 
pectore et regione auriculari paulo obscurioribus : fronte, pileo 
toto, nucha et macula rictali elongata rubris : pectore ochra- 
cescente albido guttato; abdomine pallide ochracescenti- 
albido, fusco transfasciato : alis intus castaneis, 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. 7*0, alee 4*5, caudse 2’6, 
rostri a rictu 1*0, tarsi 0-7. 
