2 =! eS > 
SYLVICOLIDH, WARBLERS.— GEN. 35. 95 
(Xantvus, GruBER). Wits., iii, 120, pl. 27, f. 3, and vi, 15; Nurr., i, 
AL? ADs, i503, pl. 113); Bp., 256; Coor., 82... 2) RUFICAPILLA: 
Orange-crowned Warbler. Olive-green, nearly uniform, rather brightest 
on rump, never ashy on head: below, greenish-yellow, washed with olive on 
the sides; crown with more or less concealed orange-brown patch (sometimes 
wanting) ; eye-ring and obscure superciliary line yellowish. Size of the 
last, and often difficult to distinguish in immature plumage; but a general 
oliveness and yellowness, compared with the ashy of some parts of ruficapilla, 
and the different color of the crown-patch in the two species, will usually 
be diagnostic. North America; common in the West, rare or irregular in 
the Eastern States. Bonap., Am. Orn., i, 45, pl. 5, f. 2; Nurr., i, 413; 
AUD OO Mpe 2s BD.) 200 ssCOOPG So. — «soa aban pls CHLATAT 
Tennessee Warbler. Olive-green, brighter behind but never quite yellow 
on the tail coverts, more or less ashy towards and on head ; no crown patch ; 
below, white, often glossed with yellowish but never quite yellow; a ring 
round eye, and superciliary line, whitish; frequently an obscure whitish 
spot on outer tail feathers; lores dusky ; in the 9 and young the olivaceous 
glosses the whole upper parts. 44-42, wing about 23, tail 2 or less; this 
comparative length of wing and tail, with other characters, probably always 
distinguishes the species from the foregoing. Eastern North America; rare 
in New England. Wus., iii, 83, pl. 25, f. 2; Nurr.,i, 412; Avup., ii, 91, 
POLE OF WII e 20 Ooias ie fuueimicreik-w Wie\en Gi bite teficra ep er - seat gy PEREGRINAS 
35. Genus DENDRGCA Gray. 
*,* The coloration of the rectrices is a good clue to this genus; for all the 
species, excepting cestiva and its exotic conspecies or varieties, have the tail feathers 
at all ages blotched with white—a feature only shown, among North American 
allies, in gen. 30, 31, 32 and part of 34,40. About thirty-five species pass current, 
but only twenty-seven of them are well established ; they all occur within our limits 
excepting these : —pityophila (Cuba), adelaide (Porto Rico), pharetra (Jamaica), 
olivacea (Mexico), and petechia with its several tropical forms, all like cestiva, and 
of which eoa (Jamaica) and wwreola (Galapagos) seem most likely to prove 
genuine. Of the twenty-five species ascribed to North America, one, olivacea, has 
been admitted upon insufficient evidence; of two others, ‘‘montana” and ‘“car- 
bonata,” nothing is now known; leaving twenty-two species to be here treated. 
Kirtlandii is exceedingly rare; only two or three specimens haye ever been dis- 
covered. Tigrina has been lately removed from the genus, as type of a new one 
(Perissoglossa), on account of a peculiar structure of the tongue, which resembles 
that of certain Cerebide ; but, as Sundeyall remarks, we have yet to see whether 
otheravarblers do not possess the same character. ‘This is an inviting problem; the 
student may render good service to ornithology, and reflect credit on himself, 
by examining the tongues of some additional (see Barrp, Rey., 164) species 
under a moderate magnifying power, and publishing his results. Baird’s excellent 
analysis of the North American species known-in 1858 was supplemented in 1865 
by a more complete review of the whole genus, and in 1869 a monographic essay 
was given by Sundeyvall (Ofvers. Kong]. Vetensk. Akad. Forh., 615). The follow- 
ing artificial analysis will facilitate the determination of our twenty-two established 
