163 
abdomen being highly polished; frontovertex with microscopic, very 
shallow thimble-like puncturation, appearing smooth and shining under 
low magnification; mesoscutum very finely reticulate, the anterior end of 
the mesopleura very delicately lineolate. 
Pubescence rather sparse and inconspicuously colored; the frontovertex 
with only a few fine setae, the eyes with rather sparse, very short, erect 
setae; mesonotum with sparse, subseriately arranged setae which are 
longer on the scutellum, the apex of the seutellum with a pair of still 
longer bristles; sides of propodeum and abdomen more thickly pubescent 
than other parts of the body. 
Male. Head but little, if any, thinner than in the female; as seen 
from above, strongly rounded anteriorly, with the frons slightly pro- 
tuberant and the occipital margin concave; as seen from the side, thickest 
just above the lower corners of the eyes, the dorsal side rather weakly 
rounded and much shorter than the facial side, the latter nearly straight 
except that the facial ridge between antennae is visible as a protuber- 
ance below; as seen from in front it is well rounded above, with the 
vertex slightly protuberant, but the cheeks converge below nearly straight 
to the moderately wide and somewhat emarginate oral margin; eyes some- 
what smaller than in the female, nearly round with the posterior margin 
somewhat oblate; frontovertex about one-half longer again than wide; 
ocelli large, arranged in a little less than a right-angled triangle, the 
posterior pair slightly the farthest apart, about half their own diameter 
from the eye margin and twice as far from the occipital margin, the 
anterior ocellus placed at the middle of the frontovertex; cheeks nearly 
as long as the width of the eyes, the genal suture fine but distinet; face 

Fig. 17. Buchalcerinys apicicornis. Antenna of male. 
with a rather deep, oval, longitudinal serobal impression, extending from 
the oral margin well upward between the eyes or the whole length of 
the face, nearly twice as long as wide, and divided on the lower half 
by a well elevated ridge between the antennae, which is slightly convex 
from end to end as seen from the side. 
Antennae inserted rather close together far from the oral margin, the 
upper ends of the sockets about touching the ocular line, the distance 
between the sockets nearly equal to the distanee from either to the 
nearest point of the eye, and about one-fourth less than the distance from 
the lower end of the sockets to the oral margin; scape moderately long, 
reaching well beyond the serobal impression, rather stout and fusiform 
in shape; pedicel somewhat longer than thick at apex and about equal 
to one-half of the first funicle joint; flagellum elongate, cylindrical, 
