104 
Psyche 
[June 
i q (WWK 3709); Seara, July 1958 3 w (WWK 2687). 
Parana: Bocaiuva, May 1963, F. Plaumann leg. 2 w (WWK 
3999) ; Palmeira, May 1964, F. Plaumann leg. 1 w (WWK 4015) ; 
Volta Grande, April 1949, Hertel leg. 5 w (MCZ, WWK). sao 
paulo: Barueri, December 1958, K. Lenko leg. 8 w (No. 708); 
Guararema, December 1957, W. W. Kempf leg., 1 1 w, 1 q (WWK 
2102, MCZ, Cornell) ; Jardim Botanico, Agua Funda, Sao Paulo, 
September 1958, K. Lenko leg. 8 w (No. 608) ; August 1962, and 
February 1967, W. L. Brown leg. 4 nests and partial nests from 
rotten wood, workers, queens and males (MCZ, WWK and else- 
where) ; Serra da Cantareira, cavity in small stump, with Pheidole 
sp., January 1959, W. W. Kempf and Vitor dos Santos leg., 4 w, 
1 q (WWK 2915). Boraceia, Municipio de Salesopolis, February 
1967, nest in rotten twig in litter, R. H. Crozier leg. 4 w (MCZ) 
Rio de Janeiro: Parque Nacional do Itatiaia, December 1955, 
T. Borgmeier leg. 1 w. 
Acanthognathus stipulosus sp. nov. 
(Fig. 3) 
Holotype worker: Measurements and indices given in Table I. 
A small-sized, slender species resembling A. ocellcitus and A. brevi- 
cornis. 
The character that immediately sets this species off from the rest 
is the shape of its petiole (Fig. 3). Set on a long, gently curved 
peduncle, the node is compressed anteroventrally, and is sharply 
rounded above in side-view profile. Seen from above, the anterior 
peduncle is about 3j4 times as long as the node, and the posterior 
peduncle about half as long; the node itself is about 0.10 mm long 
and 0.18 mm wide, with a convex anterior face and a flat, sloping 
posterior face; the anterior peduncle widens gradually behind the 
spiracles to receive the node. Seen from behind, the node is some- 
what like a Formica petiole in outline, with broadly rounded crest, 
bulging sides and narrower ventral portion. Postpetiole about 0.16 
mm long, 0.17 mm wide, subcircular as seen from above, with straight 
anterior margin. 
Also the following characters: 
( 1 ) Mandibles relatively shorter than in ocellatus, their preapical 
borders unarmed except for an almost imperceptible “submedian 
welt.” 
(2) Humeral teeth triangular, strongly projecting, rendering the 
promesonotum very slightly broader than long (cervix excluded). 
