452 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



HELMINTHOPHILA LAWRENCII (Herrick). 

 LAWRENCE'S WARBLER. 



Pattern of coloration the same as in H. chrysoptera (except, some- 

 times, as to wing-markings), but back, etc. , yellowish olive-green and 

 the malar stripe and under parts (except throat) pure gamboge yellow, 

 as m R. pinus; wing- bands usually (?) separated and whitish, as in 

 H. pinus. 



Adult male m, spring. — Forehead and anterior half of crown intense 

 gamboge yellow, verging to orange; chin, wide malar stripe, and 

 entire lower parts of body (except under tail-coverts) rich gamboge 

 yellow; lores, suborbital region, and auriculars, deep black; upper 

 eyelid yellow, the lower black; a.gular and jugular patch of deep 

 black, of triangular form, pointed anteriorly, greatly widened on the 

 chest, where its posterior outline is convex; thighs dull white, stained 

 with yellow; under tail-coverts white, the tips of the feathers faintly 

 stained with yellow; occiput, hindneck, back, rump, and upper tail- 

 coverts bright olive-green; wings and tail bluish gray, the middle and 

 greater wing-coverts tipped with white, forming two wide and tolera- 

 bly distinct bands, the greater coverts and tertials narrowly edged 

 with olive-green ; inner webs of four outer rectrices with more or less 

 white, amounting to only an elongated speck on the fourth, but on 

 the first occupying nearly the whole web; wing, 59.7; tail, 53.3; cul- 

 men, 11.4; tarsus, 17.8.^ (Description from the type in collection of 

 Harold Herrick, New York City.) 



Immature male {second year). — Similar to the fully adult plumage, 

 but colors duller and all the markings less sharplj' defined; black throat- 

 patch broken by narrow yellow margins to the feathers, especially for 

 the anterior half; black postocular patch less extensive than in the 

 adult male, and less deeply black; yellow of head and lower parts 

 less pure, as well as less intense; wing, 63.5; tail, 54.6; culmen, 12.7; 

 tarsus, 17.8; middle toe, 10.2.^ (Fi'om specimen in the Lawrence 

 collection, from Hoboken, New Jersey; spring of 1876.) 



[This bird, the status of which has not yet been fully determined, is 

 essentially a H. chrysoptera with olive-green replacing the gray of that 

 species and brigh't yellow replacing the white, but with white wing- 

 bands, as in typical Id. pinus. ^ It is also essentially a R. pinm with 



' Wing measured with primaries pressed flat against the rule, and tail measured to 

 base of the coccyx. 



''The character of the wing-markings is, however, not strictly diagnostic in the 

 case of either H. chrysoptera or H. pinus. Sometimes the yellow wing-patch of the 

 former is distinctly separated into two bands by the extensively dark basal portion 

 of the greater coverts, while occasionally the color of these bands, or even of the 

 larger patch itself, may be nearer white than yellow. On the other hand, H. pinw 

 sometimes has the two bands so nearly confluent as to form quite as large and con- 

 tinuous a patch as in H. chrysoptera (sometimes the anterior band is wanting alto- 

 gether and the posterior one obsolete), while frequently the band or patch is more 

 or less strongly tinged with yellow. 



