BIRDS OF SOUTHERN VERACRUZ — WETMORE 307 



their singing, which I recorded at intervals until my departure on 

 April 15. They ranged in leafy cover, sometimes in tree tops pro- 

 jecting above the surrounding growth, and sometimes along thicket 

 lined trails, or in more open trees near the village. They moved 

 along rather quickly and kept under shelter. 



Family VIREONIDAE 



VIREO GRISEUS GRISEUS (Boddaert) : White-eyed Vireo 



Tanagra grisea Boddaeet, Table des planches enlumineez, 1783, p. 45 

 (Louisiana). 

 This familiar bird is a common winter resident in the thickets 

 bordering the milpas about Tres Zapotes. In March I found them 

 singing regularly and for a time it almost seemed that they were on 

 their breeding grounds, but by the end of the month they had begun 

 to decrease in abundance. On April 11, 1939, I noted that they were 

 far less conspicuous, so that by then the majority apparently had 

 moved north. The song was puzzling as it differed somewhat from 

 that given in their breeding grounds, being not so emphatic or loud. 

 Carriker found them abundant from late January to March, when 

 they disappeared. Our specimens are all of the northern form. 



VIREO FLAVOVIRIDIS FLAVOVIRIDIS (Cassin) 



Vireosylvia flavoviridis Cassin, Proc. Acad. Nat. Sci. Philadelphia, vol. 5, 1851, 

 p. 152 (San Juan de Nicaragua, Nicaragua). 



This bird in 1939 apparently arrived late in its return from its 

 winter home to the Tres Zapotes region, as I found none to the date 

 of my departure on April 15. The following year Carriker secured 

 the first one April 3 on Cerro de Tuxtla, followed by another from 

 Hueyapa April 8. They were common on Tuxtla, where additional 

 specimens were taken April 9 and May 4, and were found in smaller 

 numbers in the lowlands. Carriker shot one at El Conejo on May 15 

 and one at Tlacotalpam on May 17. 



Vireo flavoviridis differs from Vireo olivaceus in the distinctly 

 yellowish-green sides and under tail-coverts, so that the two may be 

 distinguished at a glance. The yellowish-green color is as evident in 

 very young -flavoviridis in full juvenal plumage as it is in adults. 

 In Vireo olivaceus, adult and juvenal, there is never more than a trace 

 of this brighter color, and where present this is duller, more greenish, 

 perceptible only on close scrutiny. I have examined considerable 

 series of both birds without finding indication of intergradation, so that 

 I am forced to conclude that the two are specifically distinct in spite 

 of current treatment of them where flavoviridis has been listed as a 

 geographic race of olivaceus. 



