PSYCHE 
A JOURNAL OF ENTOMOLOGY 
Vol. 78 
December, 1971 
No. 4 
CONTENTS 
The Behavior of a Stinkbug, Euschistus conspersus Uhler (Hemiptera: 
Pentatomidae). John Alcock 215 
The Orb-Weaver Genera Singa and Hypsosinga in America (Araneae: 
Araneidae). Herbert W. Levi 229 
The Displacement of Native Ant Species by the Introduced Argentine 
Ant, Iridomyrmex humilis Mayr. James M. Erickson 257 
Additional Insects in Pennsylvanian Concretions from Illinois. 
F. M. Carpenter and Eugene S. Richardson, Jr 267 
The Male Genitalia of Blattaria. VIII. Panchlora, Anchoblatta, Biol- 
leya, Pelloblatta, and Achroblatta. (Blaberidae: Panchlorinae) . 
Louis M. Roth 296 
The Structure of Dunbaria. (Palaeodictyoptera) . 
Jarmila Kukalova-Peck 306 
The Mating Behavior of Parcoblatta fulvescens (Saussure and 
Zehntner) (Blattaria, Blattellidae) . 
Peter W endelken and R. H. Barth 319 
Barriers to Gene Flow in Natural Populations of Grasshoppers. II. 
Maintenance of Narrow Hybrid-Zones between Morphs of Arphia 
conspersa on Black Mesa, Colorado. 
Robert B. Willey and Ruth L. Willey 330 
Index to Volume 78 351 
