Trippe.] ‘ 936 [October 16, 
75. Vireo olivaceus. Common in Mahaska County; much less 
so in Decatur; breeds. ; 
76. Vireo gilvus. Common; breeds. 
77. Vireo Bellii. Breeds abiiteaniig’ in Decatur esti where 
it is the commonest species of Vireo, but not seen in Mahaska. It 
arrives in the second week in May, and is seldom seen after the mid- 
dle of August. In its habits it bears a strong resemblance to the 
White-eyed Vireo, preferring the thickets and underbrush, rather 
than the trees. Its notes are quite different from those of any other 
Vireo, being somewhat like those of the bluebird in early spring, but 
quicker and more hurried. 
78. Vireo flavifrons. Common; breeds. 
79. Mimus carolinensis. Common in Decatur County: less 
so in Mahaska; breeds. 
80. Harporhynchus rufus. Common; breeds. 
81. Salpinctes obsoletus. A specimen taken in October, in 
Decatur County, and several others seen. Not observed in Mahaska 
County. 
82. Cestothorus stellaris. Not common; breeds. 
83. Troglodytes eedon. Abundant; breeds. 
84. Certhia americana. A few observed in fall and winter, 
in Mahaska County, but none in Decatur. 
85. Sitta carolinensis. Common; breeds. 
86. Polioptila ceerulea. Common; breeds. 
87. _hophophanes bicolor. Abundant; resident throughout 
the year. 
88. Parus atricapillus. Common; breeds; resident. 
89. Eremophila cornuta. Abundant; breeds, and nearly 
resident, being absent only a few weeks in the depth of winter, some 
few remaining even then. It nests early in May, occasionally as 
late as the 25th. The nest is composed of grass, and is placed on 
the ground. The male frequently relieves his mate in the task of in- 
cubation. The young birds remain with their parents till fall, when 
they gather into flocks of from ten to one hundred or more. 
90. Chrysomitris tristis. Common; breeds. 
91. Aigiothus linaria. Seen in considerable numbers in the 
depth of winter, in Mahaska County. 
92. Plectrophanes lapponicus. Abundant. Disappears in 
the middle of April. 
93. Plectrophanes nivalis. A few occur every winter, but 
abundant only in severe seasons. 
