Wood-Thrush 517 



and rather carelessly and untidily constructed of sticks 

 on the outside and coarse grasses within, and has no 

 further lining. It is somewhat shallow and flat. The 

 eggs, nearly always four in number, are greyish- white, 

 splashed to a varying extent with rusty-brown and pale 

 lilac. They measure about "95 x "68. Gale found 

 fresh eggs between May 20th and June 25th, and this 

 agrees with the observations of other naturalists. 



Genus H"iXOCICHLA. 



Bill moderate, rather weak ; wings long and pointed, outer primary 

 very short and spurious ; tail always very clearly shorter than the 

 wing, about even ; tarsus rather long and slender, always exceeding 

 the middle toe and claw ; plumage plain brown above, spotted or 

 streaked below on a white or yellowish-white ground ; never any blue. 



A considerable North American genus, closely allied to the true 

 Thrushes (Turdus) of the Old World. Five species and a good many 

 additional subspecies occur in the United States. H. guttata pallaai 

 may possibly occur in Colorado, so it is here included in the key. 



Key of the Species. 



A. Spots on the lower surface very distinct and extending on to 



the flanks. H. mustelina, p. 517. 



B. Spots on the lower surface less distinct and not extending on 



to the flanks. 



a. Upper-parts the same colour throughout. 



a^ A distinct buSy ring round the eye. H. u. swainsoni, p. 519. 

 b^ No buffy ring round the eye. H. f. salicicola, p. 518. 



b. Rump and tail with a distinct rufous shade contrasting with 



the olive back 

 a^ Larger — wing over 3-55. 



a^ More richly coloured, especially the rufous of the tail. 



H. g. pallasi. 



b* Duller and less richly coloured. H. g. auduboni, p. 521. 



b^ Smaller — wing under 3 50. H. guttata, p. 521. 



Wood-Thrush. Hylocichla mustelina. 



A.O.U. Checklist no 755 — Colorado Record — Henderson 05, p. 42. 



Description. — Adult — Above head and back cinnamon-brown, fading 

 to ohve-brown on the rump, tail and wings ; a white orbital ring ; 

 below white, marked on the breast and flanks with large well-defined 



