Grey Titmouse 503 
seven in number, are pure white with light reddish- 
brown speckling, chiefly at the larger end, and average 
‘62 x ‘47 (Norris). According to Gale, who took a very 
large number of nests in the hills of Boulder co., and from 
whose notes this account has been chiefly taxen, fresh 
eggs are to be met with from the end of May to the 
middle of June. 
Family PARIDA. 
Small birds—wing under 3, with a short, stout, com- 
pressed conical bill, shorter than the head, not notched, 
and with the culmen rounded or flattened ; nostril entirely 
concealed by dense tufts of feathers; wing with ten 
primaries, the outer about half the length of the next, 
somewhat rounded, shorter than or only just exceeding 
the tail; tarsus scutellate; tail-feathers never stiff or 
acuminate. 
Key oF THE GENERA. 
A. Head crested ; plumage plain ; wing slightly exceeding the tail. 
Bezolophus, p. 503. 
B. Head not crested. 
a. Crown and throat always black ; wing and tail about equal. 
Penthestes, p. 504. 
b. No black on crown or throat; tail distinctly exceeding the 
wing and markedly graduated. Psaltriparus, p. 508. 
Genus B/EOLOPHUS. 
Head crested ; build very stout and conical; wings rather long but 
rounded ; tail slightly shorter than the wing, slightly rounded ; plumage 
plain grey without black. 
The genus contains four species, confined to the warmer parts of 
North America. 
Grey Titmouse. Bolophus inornatus griseus. 
A.0.U. Checklist no 733a—Colorado Records—Aiken 72, p. 195; 
Ridgway 73, pp. 179, 189; Drew 81, p. 87; 85, p. 15; Morrison 88, 
p. 71; Lowe 94, p. 270; Cooke 97, pp. 122, 169; Gilman 07, p. 195; 
Warren 08, p. 25; 09, p. 17; Rockwell 08, p. 178 ; Cary 09, p. 184. 
