1969] 
Brown and Kempf — - A canthognathus 
105 
Sculpture of promesonotum consisting of about 8 slightly wavy 
costulae running anteriad from the metanotal groove and fanning out 
to meet 2-3 short transverse costulae on the anterior pronotum; 
costulae and interspaces shining; cervix smooth and shining. 
(3) Propodeal dorsum gently convex, smooth and shining discad; 
spines long and nearly straight as seen from side, but slightly di- 
vergent with apices incurved as seen from above; moderately elevated. 
(4) Head smooth and shining, with spaced but large and distinct 
round fossae over the dorsum, each centrally tuberculate and bearing 
an inclined, short, white clavate hair. Sides of alitrunk loosely rugose, 
shining; rest of body and most parts of appendages smooth and 
shining. 
(5) Color reddish ferruginous, gaster darker, reddish-brown; legs, 
mandibles and antennae pale straw yellow, middle and posterior 
femora each with a broad subapical brownish band. 
Holotype (MCZ) a unique taken in rain forest near the quarry 
at the high falls (Cachoeira Alta) of a branch of the Rio Taruma, 
northeast of Manaus, Amazonas, Brasil; 28 August 1962, W. L. 
Brown, Jr., leg. The worker was taken from a leaf litter berlesate. 
This is the first record of the genus from the middle Amazonian 
region. It must be uncommon, for it was taken only once out of 
many Berlese funnel extractions from the Manaus area. 
Acanthognathus teledectus sp. nov. 
(Fig. 11) 
Holotype worker: Measurements and indices in Table I. A large 
species, distinguished by the very narrow head and extremely long 
mandibles. In addition, the following character states: 
1. Each mandible with 2 long and 1 short spiniform preapical 
teeth, also a well developed convex lamelliform welt beyond mid- 
length, giving rise to a fine erectile trigger hair. 
2. Clypeus very narrow. 
3. Alitrunk slender, humeral angles low, obtuse, not strongly 
projecting. Propodeal dorsum flat; spines approximately straight, only 
slightly diverging, not quite as long as the distance between the 
centers of their bases, only slightly elevated. 
Petiole and postpetiole formed much as in rudis, but relatively 
more slender (petiolar node 0.16 mm wide) ; node as seen from above 
oval, slightly longer than broad, and about half as long as its anterior 
peduncle. Postpetiole about 0.19 mm long and 0.18 mm wide, nar- 
rower anteriad. 
