202 VIREONIDZ. 
differences of colour, but also in the relative length of the spurious primary. They 
were therefore described as Vireo ochraceus! and V. semiflavus* respectively. 
Prof. Baird, however, to whom the types were submitted with the advantage of two 
additional specimens for examination, came to the conclusion that the differences 
observable were not greater than might be expected in birds shot, the one in January 
and the other in April. He therefore united V. ochraceus and. V. semifiavus under 
the former name*. We now possess two additional examples: one, from Progreso, 
agrees with the type of V. semiflavus; the other, from Corosal in British Honduras, is 
exactly similar to V. ochraceus. Any supposed difference in locality is therefore broken 
down, and Prof. Baird’s view strengthened rather than otherwise. We therefore follow 
him in placing V. semiflavus as a synonym of V. ochraceus; at the same time we may 
remark en passant that the difference between the types is more pronounced than those 
to be traced between such races as V. solitarius, V. cassini, and V. propinquus, or 
V. gilva and V. swainsoni. 
V. ochraceus is a little-known bird, and only twice came under our observation— 
once in April 1862 in a copse in the savana country near Sakluk, in the Department 
of Peten, and again in J anuary 1863 in the woods skirting the Pacific shore near the 
Guatemalan port of San José. From this last bird, a female, our figure is taken. 
17. Vireo pallens. (Tab. XII. fig. 2.) 
Vireo pallens, Salv. P. Z. 8. 1868, p. 1881; Ibis, 1866, p. 193°; Baird, Rev. Am. B. i. p. 865°. 
Supra obscure olivaceus ; tenia preoculari pallide flava; subtus sordide albus flavido vix tinctus; alis et cauda 
nigricanti-fuscis, illis albido limbatis et bifasciatis, hac dorsi colore marginata; rostri maxilla pallide 
cornea, mandibula albida. Long. tota 4:6, ale 2:3, caude 1°9, rostri a rictu 0°65, tarsi 0°85. (Descr. 
maris ex Punta Arenas, Costa Rica. Mus. nostr.) 
Hab. Nicaraeva, Realejo? (J. IM. Dow & O. 8.1); Costa Rica, Punta Arenas (J. UZ. Dow 
& 0. 8), 
Of this species nothing, so far as we know, has been noticed since the original 
specimens were procured in March 1863 at Realejo (now called Corinto) and at Punta 
Arenas by Capt. Dow and Salvin during a voyage from Guatemala to Panama. In 
both cases the birds were found in the woods behind those seaport towns. In their 
habits nothing of special note was observed. In its general appearance this bird is 
not unlike V. pusillus of Arizona and Lower California, having hardly any olive-colour 
in its plumage, the upper parts being ashy, and the under parts white, with but a very 
faint shade of olive-colour*. It may be distinguished from V. pustl/us by the presence 
of two white bands on the wings instead of only one, and in the wings being more 
rounded. The shape and size of V. pallens is much that of V. ochraceus; but it wants 
the colour of that bird, besides having a longer spurious first primary. The Punta 
Arenas specimen, a male, is figured. 
* The figure is rather too highly coloured. 
