22 
Psyche 
[March 
except as follows: first recurrent vein received at middle of second 
submarginal cell, second recurrent .43 distance from base of third 
submarginal, the latter cell 1.5 X as wide as its greatest height. 
Abdomen much more robust than in imitator J the first segment more 
strongly expanded from base to apex; subgenital plate tapered toward 
the apex, which is subtruncate; genitalia as shown in Fig. 18. 
ACKNOWLEDGEMENTS 
I wish to thank Charles C. Porter for supplying the material which 
inspired this paper and for providing me with notes regarding his 
collecting experiences with members of this complex. He also identi- 
fied the Ichneumonidae. Henry K. Townes and Lincoln P. Brower 
read an earlier draft of the paper and made a number of useful sug- 
gestions. Mary Jane West suggested several improvements in the 
final draft. 
References 
Arle, R. 
1947. Nouvelles especes de Pompilidae du Bresil (Hymenoptera) . 
Revista Ent., 18: 416-428. 
Banks, N. 
1945. The Psammocharidae (Spider-Wasps) of Northern South 
America. Bol. Ent. Venez., 4: 81-126. 
1946. Studies of South American Psammocharidae. Part I. Bull. Mus. 
Comp. Zool. Harvard, 96: 311-525. 
Brower, J. V. Z., and L. P. Brower 
1965. Experimental studies of mimicry. 8. Further investigations of 
honeybees (Apis mellifera) and their dronefly mimics (Eristalis 
spp.). Amer. Nat., 99: 173-188. 
Brower, L. P., J. V. Z. Brower, and J. M. Corvino 
1967. Plant poisons in a terrestrial food chain. Proc. Nat. Acad. Sci., 
57: 893-898. 
Evans, H. E. 
1966. A revision of the Mexican and Central American spider wasps 
of the subfamily Pompilinae (Hymenoptera: Pompilidae). Mem. 
Amer. Ent. Soc., no. 20. 442 pp. 
Fox, W. J. 
1897. Contributions to a knowledge of the Hymenoptera of Brazil. 
Proc. Acad. Nat. Sci. Phila., 1897, pp. 229-283. 
Townes, H. K. 
1957. Nearctic wasps of the subfamilies Pepsinae and Ceropalinae. 
Bull. U. S. Nat. Mus., 209: 1-286. 
