TABLE OF CONTENTS. VOLUME 6. 
Proceedings 1 
Some fossil plants from the middle Devonian of Milwaukee, 
Wisconsin. By D. P. Penhallow 8 
A preliminary list of Wisconsin mammals. By Hartley H. T. 
Jackson 13 
Fossil Cercopidae (Homoptera). By T. 'D. A. Cockerell 35 
The Pseudoscorpions of Texas. By Nathan Banks 39 
A rapid melanistic and subsequent partial albinistic change in a 
caged robin. By Henry L. Ward 43 
Notes and descriptions of North America Parasitic Hjonenoptera. 
VI. By Charles T. Brues 48 
Review of the dragon-flies of Wisconsin. By Richard Muttkowski 57 
An addition to the avifauna of Wisconsin. By Henry L. Ward.. . 124 
Proceedings 129 
Not'CS on Wisconsin mammals. By N. Hollister 137 
The last records of deer in Walworth county, Wisconsin. By N. 
Hollister 143 
The American Elk in Southern Wisconsin. By Henry L. Ward . . 145 
The nesting of Anacrabro ocellatus Pack. By George P. Barth. . 147 
Notes and descriptions of North American Parasitic Hymenoptera 
VII. By Charles T. Bnies 154 
A summer's insect collecting. By Richard A. Muttkowski 164 
A new fossil grass from the Miocene of Florissant, Colorado. By 
Charles T. and Beirne B. Briies 170 
Briefer Articles 171 
liist of members of the Wisconsin Natural History Society 172 
