TBOGLQDYTIMS — THE WEEKS. 
IS 
Genus CERTHIA, Linn. 
Secies and Varieties. 
C. familiaris. Above brownish, more rufescent on the rump; each feather 
streaked centrally with whitish; wings with about three zigzag bands of pale 
©chraceous. Lower parts whitish; a white streak over the eye. 
A. Crissum white. 
Tail shorter than wing* 
1. Dusky tints prevailing above ; beneath dull ashy-white; Wing, 2.50); 
tail, 2.20 ; bill, .55. Hah. Europe- ..... var. familiarise 
Tail longer than wing . 
2. Light tints prevailing above ; beneath pure silky-white. Wing, 2.00); 
tail, 2. 65 ; bill, .7©. Hah. Europe . ... . . .. var. costce.. 
B« Crissum ochraceous. 
3. Rump fulvous; beneath pure silky- white. Wing 2.60';; tail, 2.85; 
bill, .60. (Pacific coast specimens more brownish, with longer bills.) 
Hob. Whole of North Americas ..... var. americana. 
4. Rump chestnut ; beneath (Ml ashy-white. Wing, 2.50 ;; tail, 2.70'; 
bill, .65w Hab. Table-lands of Mexico .... var. mexicwna* 
Family TROGLQDYTID2E. — Tbe Weens. 
Char. Rictal bristles wanting; the loral feathers with bristly points.. Bill usually 
without notch.. Wings much rounded, about equal to tail, which is graduated. Prima- 
ries ten, the first generally about half the second.. Basal joint of middle toe usually united 
to half the basal joint of inner, and the whole of that of the outer, or more.. Lateral toe& 
about equal, or the outer a little the longer. Tarsi scutellate.. Eyes brown except im 
Camjayhrhymhm* Eggs and nest various. 
r- Genera, ^ . 
Ao Lateral toes very unequal. 
a. Culmen depressed basally, the- interval between the nostrils wider than 
the much compressed anterior half of the bill. Plate on the posterior half 
of the tarsus continuous; Catherpes. (Page 14.) ^§ 5 
b. Culmen compressed' basally, the interval between the nostrils narrower 
than the rather depressed anterior half of the bill Plate on the posterior- '} 
half of the tarsus broken into smaller scales. Salpinctes. (Page 14.) 
B. Lateral toes equal. 
c. Length about 8 inches. Campylorhynchus. (Page 14.) 1 
d. Length less than © inches. 
Bill abruptly decurved or hooked at the tip.. Outstretched feet not 
reaching near to end of tail. Thry othorus. (Page 14.) 
Tail longer than the wing, the feathers black, variegated termi- 
nally with whitish. (Page QQO . . . Subgenus Th r y o m a n e s- ° 
Tail shorter than the wing, the feathers rusty, not variegated with 
whitish. (Page Op .) ...... Subgenus Thry other u s . 
Bill only gently curved at the tip; Quteteetehed feet reaching nearly 
to or feeyoad the ©nd of 'the- taiL 
