112 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4TH Ser. 
Twelve of the twenty May specimens were taken on the first 
day of the month and are in about the same stage of wear and 
restoration as the April ones, which is also true of a specimen 
shot on the 15th. In one secured on the 18th, the moult has 
extended to the greater and lesser wing-coverts and the six 
inner primaries. Three specimens procured on the 27th, 28th, 
and 29th show further progress. Only the outer four old 
primaries are left and the new inner ones are pushing out be- 
yond the secondaries, which are also involved in the moult. 
A middle and a lateral rectrix are being renewed in one of the 
specimens. Three others, obtained on the same days, have 
lagged behind, two retaining the outer five old primaries and 
one all of them. i 
The thirty-three June examples (none of them hornotines) 
exhibit considerable diversity in the extent of the moult, but as 
a whole marked advancement has been made over April and 
May renewals. Three of five examples secured on the 27th 
retain four worn outermost primaries while two obtained on 
the 22nd and 25th have moulted all of the primaries except the 
first. Generally the replacement has progressed in the wing- 
coverts and in the tail and secondaries. 
In most instances, the twenty specimens of July (2nd to 
18th) have kept pace with the season in their feather renewal. 
Nine of them, obtained on the 18th, have moulted all of their 
primaries. However, abraded feathers elsewhere are not want- 
ing as an index of age. A specimen of the 7th, one of the 8th, 
and two of the 10th have retained the first of the old primaries 
and another of the 8th also the second on the right wing. 
Three specimens, shot on the 2nd, 10th, and 18th respectively, 
have the outer two old primaries left and two specimens of the 
8th the outer three and one specimen of the 7th the outer six. 
In the most advanced specimens all the rectrices have been 
moulted. Already the new greater and middle wing-coverts 
show wear, and this before the moult has been completed. It 
may truly be said that such birds are never in full feather. 
None of the eight August specimens (shot on the 2nd, 22nd, 
23rd, 27th, and 30th) have completed the moult of the upper 
and lower parts of the head and body, but the old primaries 
and rectrices have been cast. Destructive changes are already 
