1967] 
Brown & Kempf ■ — Tatuidris 
187 
entire length of the flexor surface. On other legs, tarsal segments 
are mostly longer than broad. 
Integument prevailingly smooth and shining, with fine, loose stria- 
tion and reticulation mainly confined to the sides of the alitrunk, 
nodes and mandibles, and to the propodeal declivity. Pilosity fine, 
short to long, rather abundant. Color ferruginous. 
Queen and male unknown. 
Type and only known species is Tatuidris tatusia sp. nov., next 
described, from Central America. 
Tatuidris tatusia, species nov. 
(Figures 1-4) 
Holotype worker: Total outstretched length, including mandibles 
and axial dimension of gaster to its apex, 3.5 mm. Head L 0.82, 
head W 0.96, L closed mandibles 0.25, diagonal (Weber’s) L of 
alitrunk (cervix omitted) 0.78 mm. Scape L (chord to basal collar) 
0.40, L terminal antennal segment 0.30 mm, which is about half of 
total L of funiculus. Greatest diameter of eye 0.07 mm (about 
10 facets total in each eye). 
The form of the body, sculpture and pilosity are indicated in the 
figures. The clypeal suture is obsolete, marked only by a shallow 
sulcus in the ruddle, so the dotted lines in Figure 4 show only the 
approximate boundary. The free margin of the clypeus is concave 
v . erall, but an almost invisible, low, thin, transparent median lobe 
forms a median convexity in front of a darker, evenly concave in- 
ternal line showing through the integument; this dark line is very 
prominent, and at first sight looks like the free margin proper. 
The remarkable mandibular brush is shown in Figure 3 ; its con- 
stituent setae are thick, stiff and pigmented, short near the masticatory 
margin and becoming longer lateroventrad. In the closed mandibles, 
the brushes are visible only from ventral view. The trophi were 
dissected in both the holotype and paratype. The maxillary palpi were 
never clearly seen, but the parts assumed to represent them are ex- 
tremely small and inconspicuous, albeit each with a long apical sensil- 
lum. The labial palpi consist each of 2 clavate segments with curved 
slender bases; the apical segment has a single apical sensillum. The 
foramen magnum is situated in a small funnel-shaped process ex- 
tending rather prominently from the deeply excavated underside of 
the isolated cranium, but covered by the cervix in the entire insect. 
Pronotum marginate in front, but the margin becoming indis- 
