70 
Psyche 
[June 
tral to this tooth, and even slightly basad, is found what I 
consider to be the true apical fork, crowded into a new 
position, consisting of two principal spiniform teeth and 
two acute, but small, intercalary teeth. The distal (dorsal) 
of the two larger teeth is 2/3, the proximal about half the 
length of the large false apical tooth. From direct dorsal 
view, the true ventral apical tooth appears like a preapical 
tooth, being situated a bit basad of the false apical tooth, 
but on the ventral edge of the inner border in contrast to 
the usual position of preapical teeth in the genus. The ven- 
tral tooth is not shown in the figure, although it would 
normally be at least partly visible in the same view. Al- 
together, the apical armature reveals its aberrant relation- 
ships only on close, critical examination, and the total ef- 
fect is not strikingly different from that of other species 
of Strumigenys, several of which lack preapical dentition. 
The basal lamella present as a stout, blunt projection form- 
ing a continuation of the inner margin; normally covered 
entirely by the clypeus at mandibular closure. From ven- 
tral view, the basal portion of each mandible is excavated 
to receive an axehead-shaped lateral lobe of the labrum. 
Labrum deeply cleft in the middle, the two labral con- 
icles short and subacute, bearing divergent trigger-hairs 
which curve to follow the mandibles to a little beyond the 
midlength of the latter. Palpi as usual for the genus. 
Antennal scapes very short, exposed length slightly less 
than the breadth of the head at the level of their inser- 
tions and less than half the maximum distance across the 
occipital lobes, moderately incrassate, with nearly straight 
posterior border and gently arcuate anterior border. Fun- 
iculus stout, the apical segment taking up very slightly 
more than half its length; segments II and III appearing 
nearly as broad as long in some views and slightly broader 
than long in others, together about equalling in length IV ; 
the basal segment very slightly longer, but more slender, 
than IV. 
Alitrunk compact, high in profile, but rather narrow; 
pronotum less than half as broad as head, disc convex in 
both directions, narrowly rounded in front and with a low 
margin here; no humeral angles. Seen from the side, pro- 
mesonotum forms a high, strongly arched hump, with the 
