127 [Vol. xl. 
Maapre (Pica pica). A series showing great variation. 
Among them a clutch of six from Yorkshire with heavily 
pigmented caps, the remaining portion almost unmarked, 
a clutch of six very blue eggs from Lancashire, almost 
unmarked, a clutch of six from Radnorshire, very heavily 
and evenly marked. 
British Jay (Garrulus glandarius rufitergum). A very 
beautiful series showing great variation : among the varieties 
were a clutch of six, and two of four, erythristic eggs; 
heavily banded and black-veined eggs were well repre- 
sented. 
Tuick-prtLED NttrcorackEeR (Nucifraga caryocatactes). 
Three clutches of four and one of three very typical eggs 
from Bosnia and Switzerland. 
CuHoucs (Pyrrhocorax pyrrhocorax). A carefully selected 
series of types and varieties; among the former was one 
clutch of seven from Ireland and a clutch of five showing 
distinct tendency towards erythrism—a clutch of five with 
very bold markings which is exceptionally rare in the eggs 
of this species. 
Mr. Bunyarp then read the following paper “On the 
Eggs of the Genus Corax” :— 
Oologically speaking, the eggs of this genus present one 
of the most interesting and difficult problems we have to 
deal with—interesting because of their great beauty, and 
difficult because the eggs of each species are oologically 
closely allied ; and, if further proof were necessary in regard 
to the correct classification of the genus, one has only to 
study a series of the eggs for the most convincing proof. 
Fortunately, however, with the exception of C. corone and 
C. corniz, the breeding-habits differ considerably. Thus in 
this country we have C. corax using cliffs, C. frugilegus 
generally in large colonies in trees (exceptionally solitary 
nests are found), and C. monedula in holes of trees, buildings, 
and cliffs. Corone and cornia being very distinct birds, and 
the breeding-haunts generally widely separated, the difficulties 
for the field-naturalist are not greater than is the case with 
