82 Trans. Acad. Sci. of St. Louis 
has compared the color with Ridgway’s (1912) standards. On 
this basis the egg may be described as elliptical, rather unusually 
pointed for a Passerine bird, with a ground color of grey or, 
occasionally, with a greenish tinge. The spotting is fine, uni- 
form, almost completely concealing the background, and is cin- 
namon-brown in color. The eggs are quite uniform but many 
have a denser ring of pigment about the larger end (see Plate 
XVI, Fig. 2). Saunders (1899), describes in Otocoris alpestris 
flava of Europe occasional ‘‘hair-lines” about the larger end. 
One case of this was observed in praticola (see Plate XVI, Fig. 
1). Another interesting color variation was that of a single 
egg in two nests of the ‘‘B’’ female (nests Bz and Bs). Here 
a deficit of pigment caused the egg to show more background 
than normal (see Plates IX, Fig. 2, and XVIII, Fig. 2). It 
was probably the fourth and last egg laid for it was the last 
to hatch. Nest Bi had but three eggs so this type of coloration 
did not appear in it. Incidentally this egg, as well as the charac- 
teristic actions of the bird, made positive the identity of the 
owner of the nests and confirmed the evidence of the territory. 
There is but little of significance in an egg measurement, still 
twenty-two eggs of nine different nests were measured. The 
average length of the twenty-two was 2.25 em., the average width 
1.55 em. The smallest was 2.13 by 1.46 em., the largest 2.45 by 
1.58 cm., the longest 2.45 em., the shortest 2.13 em., the broadest 
1.66 cm., the narrowest 1.46 em. Mouseley (1917), in his study 
of second sets, found a considerable descrepancy in size (.82 by 
-58 inch average first set as opposed to .78 by .58 inch average, 
second set). My results are the reverse of this. A single egg 
of Nest A1, laid about March 15, measured 1.58 by 2.13 cm., 
three eggs of nest Az, laid between April 21 and 23, were all 
of the same measurement, viz., 1.58 by 2.22 em. 
The number of eggs per set varies from two to five ordinarily, 
though Levy (1920) records a most exceptional case of eight 
eggs in a nest. March nests have the smaller sets, usually two 
or three. Five nests of two eggs, eleven of three, eleven nests 
of four, five nests of five, made up the sets of the nests at Evans- 
ton and Ithaca. Some of these, of course, had hatched before 
the nests were found. There is probably a close relationship be- 
tween temperature and small sets in March (sets of five occurred 
only in late April, May and June). Nine eggs of five sets at 
