io8 
Psyche 
[June 
3. Antennal scapes short, chord less than 90% as long as manidibles 
seen in dorsal view; preapical area of inner mandibular border 
with (usually 2 or more) irregular denticles (Panama and 
Brasil: Para and Rio Grande do Sul) brevicornis 
Antennal scapes with chord about as long as, to much longer 
than, the mandibles as seen in dorsal view; inner mandibular 
borders without preapical denticles, though a submedian welt 
may be present 4. 
4. Mandibles shorter (MI 60-75; Figs. 1, 4); dorsum of head 
completely, densely and rather finely rugulose, with inter- 
spersed fossae numerous, small and crowded, so that the sur- 
face, including the area around the eyes, is essentially opaque 
(SE Brasil, fairly common in wet forest in plateaux and 
uplands) rudis 
Mandibles longer (MI >75) ; dorsum of head loosely sculptured 
and more or less shining, fossae large and shallow, with smooth 
spaces or simple longitudinal rugulae between some rows; at 
least a strip bordering each eye mesially nearly smooth, shining 
5 - 
5. Fossae on posterior half of dorsum of head smaller, mostly sepa- 
rated by flat, smooth spaces (Central America, Trinidad and 
southward locally in Brasilian lowlands to S. Catarina) 
ocellatus 
Fossae on posterior half of dorsum or head large, mostly con- 
tiguous or separated by single, simple longitudinal rugulae 
(Honduras; may be only a coarsely-sculptured variant of 
ocellatus ) lentus 
Acknowledgements 
We are grateful for assistance that made this study possible. 
Brown was aided by U. S. National Science Foundation Grants 
G-23680, GB-2175 and GB-5574; Kempf received support from the 
Conselho Nacional de Pesquisas do Brasil. Dott. Delfa Guiglia gave 
us information on the type of A. ocellatus j and various collectors, 
listed under each species treatment, have sent us their valuable 
samples. Dr. Howard E. Evans (MCZ) has taken the trouble to 
mail us loans of material. 
