403 
one-half of its length above the ocular line, the prominence between an- 
tennae convex, about twice as long as wide and reaching somewhat above 
the middle of the facial impression; the scrobes proper broadly united 
above, the sloping walls of the facial impression extending far laterad of 
them (in planiscutellum the facial impression is distinctly triangular, rather 
shallow and strictly co-extensive with the scrobes proper, and the antennal 
prominence is about as wide as long); antennal sockets situated rather far 
apart near the oral margin, the distance between them somewhat less than 
the distance from either to the nearest part of the eyes, and slightly more 
than twice as great as the distance from either to the oral margin. 

Fig. 4. Zeteticontus perkinsi. A. Antenna of female. B and C. Mandi- 
ble in frontal and dorsal views. 
Antennae moderately short and distinctly clavate (Fig. 4a); scape 
slightly expanded beneath and widest at about one-half way between the 
middle and apex; pedicel equal in length to the first two funicle joints 
combined, wider at apex than the following joint and slightly narrower 
than the second funicle joint; first funicle joint much the smallest, about 
as wide as long, the following joints increasing in width and slightly in 
length, the next two not much wider than long, the sixth about one-half 
wider again than long and nearly twice as wide as the first; club oval, a 
little tapering to the rounded apex, somewhat longer than the three pre- 
ceding joints combined, its three joints nearly equal in length, the basal 
one broadest; flagellum except the first funicle joint provided with rather 
numerous but not at all crowded linear sensoria, the whole flagellum also 
with very numerous short reclinate setae, and similar, somewhat longer 
setae occur also on the scape and pedicel. Mandibles (Fig. 4b and ec) and 
palpi as in other species of the genus; the two outer teeth of mandibles 
equal, both rather shorter than in planiscutellum, and the inner tooth placed 
considerably closer to the apex than in that species, the mandible, there- 
fore, more similar to abilis as figured by Silvestri. 
Thorax nearly twice as long as wide, moderately convex and not quite 
