1979] 
Brown — New Species of Proceratium 
339 
quite attain it. Median clypeal lobe raised, broad and rounded, with a 
faint median sulcus and a tendency toward flattening, or even shallow 
emargination, of the middle of its anterior border, especially as 
viewed when the head is tilted back. Frontal area narrow-lanceolate 
and deeply impressed. Eyes each composed of a single, large, clear, 
convex facet that projects beyond the lateral margins of the head in 
full-face view. 
Mandibles each with 4 sharp teeth, including the apical; because of 
full closure, the presence of an additional tooth at the basal angle 
cannot definitely be excluded as a possibility. Labrum retracted 
against the rest of the under-mouthparts, difficult to see, but appears 
to be medially sulcate on its visible (extensor) surface and weakly 
bilobate, with a median excision of its free apical margin. Outside the 
lateral labral margins can be seen clearly 3 segments of each maxillary 
palp and 2 segments of each labial palp, so that the palpi must include 
at least 4 and 3 segments respectively. 
Underside of head shallowly concave and weakly rugulose, sunken 
between thick, rough, raised, ventrolateral cephalic margins (“occipi¬ 
tal carinae”) that originate near the mandibular insertions. 
Antennae with segment II (pedicel) longer than broad; III-VIII 
about as long as broad to slightly longer than broad; IX-XI slightly 
broader than long; apical segment about 2 x /i times as long as broad; 
the length-breadth ratios vary somewhat in different perpendicular 
views of the antennal axis. 
Trunk as seen from dorsal view weakly pyriform, evenly convex 
and slightly broader across pronotum (0.94 mm in holotype) than 
across propodeum and metathorax (0.76 mm), with only a very feeble 
constriction near truncal midlength, but convexities of mesonotum 
and propodeum as seen in side-view profile separated by a slight but 
distinct metanotal impression. Propodeum strongly convex in both 
directions, passing into declivity through a smooth curve flanked on 
each side by a short, upturned tooth; declivity smooth and shining, 
flanked on each side by a low margin bearing a short denticle at the 
bottom of each concavity, and an upturned, triangular, metapleural 
tooth or lobe at its ventral extremity. 
Propodeal spiracle small, with a nearly round aperture, directed 
posterolaterad. A curved and rather deep sulcus marks the approxi¬ 
mate juncture of propodeum with meso- and metathoracic sclerites 
below it. 
