486 Recently published Ornithological Works. 
aroma leucorrhoa), an example of which was found in Cassio- 
bury Park in November last. A still more interesting fact 
for Ornithologists is the reappearance of the Bearded Tit- 
mouse (Panurus biarmicus) in Hertfordshire in January 1905, 
the last specimen previously recorded having been met with 
in July 1888. Many other occurrences are given in his 
excellent article by Mr. Bickerton, who now claims 223 
species as belonging to the Avifauna of the county. 
58. B. O. C. Migration Report. 
[Report on the Immigrations of Summer Residents in the Spring of 
1906. Bulletin of the British Ornithologists’ Club, vol. xx. London, 
1907. 189 pp.] 
In any report on Migration it is obvious that no safe 
conclusions can be drawn from the results of a single year, 
and’we must wait for a considerable time before a reliable 
summary can be attempted ; but all work of this description 
is useful, and we are more anxious to wish every success 
to the undertaking than to criticize the details at present 
submitted. Meanwhile the returns from the Light-stations 
are of especial interest, and the records of the state of the 
weather on the different days of the months are important 
items. The records of the earliest date of breeding of 
the various species should also form a distinct feature in 
the“work, but these at present leave much to be desired, as 
they are scanty and belated. Hundreds more of observers 
are required, no area being yet sufficiently represented, 
while several counties do not furnish a single reporter. 
This being so, many arrivals must of necessity be over- 
looked ; for example, it is impossible to suppose that only 
a single Land-rail appeared in Essex during the season. 
We suggest that the district watched by each observer 
should be stated next year, and not merely his county, while 
the exact locality where each observation was made should 
be added to the record. 
On p. 12 we do not understand how a species included in 
section A can also be placed in section D; there appears to 
be some mistake in the wording. 
