274 
Psyche 
[September 
head and truncus, while modified from the general amblyoponine 
form, nevertheless do not depart from it radically, and the extreme 
posterior placement of the queen’s eyes is a “super-amblyoponine” 
character. However, the very deep constriction between the petiole 
and postpetiole, and the strong reduction (but without significant 
post-constriction) of the postpetiole, are traits that do set Apomyrma 
off very strongly from Amblyopone. For a time, our instincts wavered 
in the direction of setting up a separate new tribe. In the end, the 
impressions of the collector (Levieux), and his observation that 
Apomyrma follows the generalized amblyoponine habit of preying 
upon chilopods, pushed us to the conclusion that the new genus is 
really basically an amblyoponine. Larval characters (see following 
paper) confirm this placement. This conclusion also tends to follow 
the good rule of taxonomic parsimony, so we foreswore the establish- 
ment of a new tribe, even though the morphological definition of 
tribe Amblyoponini thereby loses most of its former sharpness based 
upon the lack of constriction between petiole and postpetiole. Actu- 
ally, this character is partly transgressed by some species of the 
Australian genus Onychomyrmex , and an African morphocline in- 
cluding Amblyopone muticum also shows one kind of approach 
toward the constriction of the posterior part of the petiole in that 
genus. 
Appendix 
Details of worker-female mouthparts 
Labrum (Figs. 9 and 14) : Distal margin emarginate but without 
medial cleft; numerous slender, tapering setae inserted on the distal 
two-thirds of the external surface; two rows of stout peg-like setae 
inserted on the proximal half of the external surface. 
Mandible (Figs. 10, 15): Internal margin not distinctly divided 
into basal and masticatory components; provided with 1 apical and 
1 subapical teeth, 3 to 4 denticles proximad of subapical tooth; 
numerous setae inserted on the dorsal and lateral surfaces and on 
the ventral surface of the internal margin. 
Maxilla (Figs. 11, 16): Maxillary palpus 2-segmented. Stipes 
subrectangular but drawn into a blunt point distally; usually 3 setae 
inserted on the proximal external face; lateral shoulder evident but 
smoothly rounded ; external surface without conspicuous sculpturing. 
Galea typically formicoid in shape, with well developed maxillary 
comb ; galeal crown inconspicuous and bearing numerous setae ; 
3 to 4 setae approximate a galeal comb in position of insertion but 
