ELVIRA. 273 
_ The birds belonging to this genus were formerly placed either in Thawmantias 
(=Agyrtria) or Hupherusa, to neither of which genera do they strictly belong. <Agyrtria 
has the tomia of the maxilla very feebly serrate, moreover the lateral rectrices are not 
white at the base. Hupherusa, on the other hand, though resembling Elvira in many 
points of structure, has a comparatively longer and less curved bill. Both species of 
Elvira are found exclusively in Costa Rica and the State of Panama. 
1. Elvira chionura. 
Trochilus (Thaumatias ?) chionura, Gould, P. Z. S. 1850, p- 162°. 
Thaumatias chionurus, Gould, Mon. Troch. v. t. 300 (May 1852)*; Lawr. Ann. Lye. N. Y. viii. 
p. 849°. 
Thaumantias chionura, Salv. P. Z. S. 1867, p. 156; 1870, p. 210°. 
Lupherusa chionura, Lawr. Ann. Lye. N, Y. ix. p. 127°. 
Elvira chionura, Muls. Hist. Nat. Ois.-Mouches, i. p. 166"; Salv. Cat. Birds Brit. Mus. xvi. p.75°. 
Eupherusa niveicauda, Lawr. Ann. Lyc. N. Y. viii. p. 134°. 
Supra saturate nitenti-gramineo-viridis, tectricibus supracaudalibus longioribus et rectricibus mediis cupreo- 
viridibus: subtus micanti-gramineo-viridis, fronte stricte et genis concoloribus, abdomine imo et tectri- 
cibus subcaudalibus albis; caudee rectricibus tribus utrinque lateralibus albis, chalybeo-nigro terminatis : 
rostri maxilla nigra, mandibula albicante apice nigra. Long. tota 3°3, ale 2°0, caude 1°15, rostri a 
rictu 0-7. 
2 supra mari similis: subtus alba, plumis cervicis et lateram macula discali viridi notatis, rectricibus utrinque 
tribus albis, fascia subterminali obliqua nigra notatis. (Descr. maris et femine ex Chiriqui, Panama. 
Mus. nostr.) 
Hab. Costa Rica, Dota? (Carmiol®); Panama, near David (Warszewiez ! 2), Volcan de 
Chiriqui °, Calovevora > (Arcé). 
This species was discovered by Warszewiez near David in Chiriqui, and was 
described by Gould in 18501'. The types (a male and a female) are in the National 
collection. With them a number of other specimens from the same district and from 
Costa Rica agree in every particular. 
A Costa Rica example sent by Carmiol from Dota was described by Mr. Lawrence 
as HL. niveicauda in 1865°, but its identity with E. chionura was soon recognized °, 
2. Elvira cupreiceps. 
Eupherusa cupreiceps, Lawr. Aun. Lyc. N. Y. viii. p. 3487; ix. p. 127°. 
Elvira cupreiceps, Muls. Hist. Nat. Ois.-Mouches, i. p. 268°; Gould, Mon. Troch. Suppl. t. 53 
(Aug. 1880)*; Zeledon, An. Mus. Nac. Costa Rica, 1887, p. 122°; Salv. Cat. Birds Brit. 
Mus. xvi. p. 75°. 
E. chionure similis, sed rostro breviore et magis arcuato, pileo et rectricibus duabus mediis saturate cupreis 
illius plumis nigro limbatis, rectricibus omnibus (preter duas medias) plus minusve albis fusco terminatis : 
rostri maxilla nigra, mandibule dimidio basali albido. Long. tota 3:3, ale 2-0, cauds 1°15, rostri 0-7. 
Q femine LH. chionure similis, pileo et cauda supra cupreis et forma rostris differt. 
Hab. Costa Rica (Carmiol, Endres), Barranca (Carmiol', Zeledon, in U.S. Nat. Mus.), 
Tucurriqui (Arcé*), Naranjo de Cartago (Zeledon®). 
BIOL. CENTR.-AMER., Aves, Vol. II., May 1892. 35 
