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PSYCHE 
A JOURNAL OF ENTOMOLOGY 
Vol. 79 September, 1972 No. 3 
CONTENTS 
The Prothorax of Coleoptera: Origin, Major Features of Variation. 
T. F. 1 1 la-vac 123 
Notes on the Biology of Polistcs carnifex (Hymenoptera, Vespidae) 
in Costa Rica and Colombia. Mary L. Corn 150 
Variation in Cell Number in a Population of Bembix americana 
(Hymenoptera: Sphecidae). John Alcock 158 
Notes on the Life Cycle and Natural History of Dismorphia virgo 
(Lepidoptera : Pieridae: Dismorphinae) in Costa Rica. 
Allen M. Young 165 
Natural History of the Spider, Hypochilus thorelli Marx 
(Hypochilidae). Ian C. Fergusson 179 
On the Identity of Three Genera of Cambaloid Millipeds from the 
Australian Region (Spirostreptida) . Richard L. Hoffman 200 
Observations on the Biology of Achaearanea tesselata (Araneae: 
Theridiidae) . William G. Eberhard 209 
A New Species of Querbetia (Diptera: Tabanidae). 
G. B. Fairchild 213 
The Spider Genus Trachelas (Araneae: Clubionidae) in the West 
Indies. Arthur M. Chickering 215 
The Genus Priotomis in Argentina (Hymenoptera, Ichneumonidae) . 
Charles C. Porter 231 
A New species of Widow Spider (Genus Latrodectus) from Southern 
Africa (Araneae: Theridiidae). Ian R. Mackay 236 
Unusual Structures in the Paleozoic Insect Orders Megasecoptera 
and Palaeodictyoptera, with a Description of a New Family. 
Jarmila Kukalova-Peck 243 
