1973] 
Porter — A nacis 
89 
the modern Neotropic ichneumonid fauna has penetrated, would be 
expected to flourish in the absence of aggressive competitors; whereas, 
populations in an area such as the Selva Tucumano-Boliviana, where 
occur scores of the Neotropic genera represented by hundreds of 
species, would form a much more inconspicuous part of the fauna 
and might have difficulty surviving at all. 
Field notes: All localities for this species belong to the wet 
subtropical forest community commonly designated Selva T ucumano- 
Boliviana. Horco Molle in Tucuman Province is located in the 
lower stratum of this forest (about 700 m.), while Posta, de Lozano 
in Jujuy Province is at 1600 m. in an area of transition between 
several types of environment, including many components of the 
Selva and some Chaco elements, as well as stands of alders ( Alnus 
joruliensis ) . 
Specimens of A. tucumana were collected by sweeping in weedy 
areas both at the edge of the forest and in partially shaded places 
within the forest. 
Acknowledgements 
Part of the material covered in this study was collected while the 
author was working as Associate Investigator under a United States 
National Science Foundation Grant (GB-6925) awarded to Dr. 
Howard E. Evans of the Museum of Comparative Zoology at Har= 
vard University. 
The figure was inked by Miss Alicia Sandoval of the Instituto 
Miguel Lillo. 
References 
Porter, C. C. 
1967. A Review of the Chilean genera of the tribe Mesostenini. Studia 
Ent. 10: 369-418. 
1970. The Genus Anacis in Argentina. Acta Zoologica Lilloana 
26(2 ) : 9-22. 
Townes, H. K. 
1969. Genera of Ichneumonidae, Part 2, Gelinae. Mem. Amer. Ent. 
Inst. 12. 
