IOO 
Psyche 
[June 
purposes. In answer to our further request, in her second letter, 
dated 29 December 1968, Dott. Guiglia graciously sent measure- 
ments of SL and ML taken to 4 decimal places of a millimeter. 
Rounded to 3 decimal places, which is nearer the limits of precision 
of standard stereomicroscopes, these are: SL 0.772, ML 0.755 — 
dimensions close to those listed for the other samples of A. ocellatus 
and not so close to those for the known samples of A. brevicornis . In 
order to differentiate further against A. brevicornis J we queried Dott. 
Guiglia about the presence of preapical denticles on the mandibles, 
and she replied emphatically in her second letter that “indistinct 
denticles on the inner mandibular margins before the apices [do] 
not exist.” 
While we recognize the danger of not actually examining the 
specimen in this case, it does seem hardly likely from the weight 
of the evidence that the ocellatus type can belong to any species 
but the one to which we here attach the name. 
Material examined: costa rica: Puerto Viejo de Sarapiqui, 
Heredia Prov., 30 July 1965, D. H. Janzen leg., 1 worker (MCZ). 
panama: Cerro Campana, Prov. Panama, ca. 800 m, 17 Jan. i960, 
G. B. Fairchild and W. L. Brown, Jr. leg., 6 w and 1 dealate queen 
with brood, from rotten twig in wet montane forest (MCZ, WWK 
and elsewhere). Barro Colorado I. } Canal Zone, 9 July 1956, 
C. W. and M. E. Rettenmeyer leg., 1 w, berlesate, dirt from bi- 
vouac of Eciton vagans. trinidad: Simla, Arima Valley, 12 Jan. 
1966, H. Markl leg., 1 w taken “at night” (MCZ). brasil: Belem, 
Para, 1914, W. M. Mann leg., 1 w and 1 dealate queen (MCZ). 
Acanthognathus rudis sp. nov. 
(Figs. 1, 2, 4-10) 
Acanihognathus ocellatus (not of Mayr) : Santschi, 1922: 353-354, fig. 2, 
worker from State of Rio de Janeiro, Brasil. — Borgmeier, 1927:120, 
record from State of Rio de Janeiro. — Kempf, 1958:553-554, record 
from Guararema, S. Paulo. — Brown and Wilson, 1959:282, fig. 3, 
worker. — Kempf, 1964:67, records from states of Rio Grande do Sul, 
Santa Catarina, Parana, Sao Paulo and Rio de Janeiro. 
Holotype worker: TL 4.2, HL 0.93, HW 0.65 (Cl 70), ML 
0.68 (MI 73), WL 0.86, petiole L in dorsal view 0.55, postpetiole 
L 0.20 (W 0.20), gaster L 0.97, greatest diameter of compound eye 
0.13, scape L (chord to basal collar) 0.76 mm. Standard measure- 
ments of a selection of specimens from the type series are listed in 
Table I. 
This species is so well known (under the name ocellatus) that 
Figs. 1, 2, and 4, and the measurements and indices, plus mention 
