14 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.64, 



and extended; subtriangular, gradually narrowing behind ocellar 

 area toward the large, posteriorly placed foramen occipitale; collum 

 distinct; dorsal surface convex, sloping apically and laterally. 

 Smooth with minute, few and scattered setae. 



Frons, (fig. 3) anteriorly without clypeal suture, laterally not 

 sharply limited by distinct frontal sutures, posteriorly acute, not 

 reaching occipital foramen ; angulus frontalis not developed. 



Clypeus and labrum, immovably united and fused with anterior 

 margin of frons into a nasale. 



Nasale, (figs. 3, 13) convex, shaped like an eye shade, anterior mar- 

 gin broadly arcuate, laterally deflexed, forming the roof above a 

 short cylindrical, horizontal space which in size corresponds to a 

 l)ee's hair ; lower half of the space framed in by the mandibles when 

 closed (fig. 4). 



Epicranial halves, large, meeting dorsally along a short, not 

 sharply defined epicranial suture, laterally and posteriorly bulging, 

 with ocellar area almost on top. Antennal foramen (figs. 5, 13) an- 

 teriorly continuous with the foramen for the mandible ; oval ; length 

 about one third of the lateral length of epicranium; ventral margin 

 of epicranium between mandibular condyle and posterior end of 

 maxilla oblique, about as long and extending as far back as the 

 antennal foramen; behind the end of maxilla, longitudinal, almost 

 straight and anteriorly with a triangular, slightly depressed enlarge- 

 ment. 



Gula, (fig. 13) narrow, longitudinal, subrectangular, about four 

 times as long as wide, smooth, without setae. 



Ocelli, (figs. 3, 5) two on each side, anteriorly placed in the bulging 

 lateral region of epicranium, rather distinct, with well developed 

 lenses and surrounded by a round, blackish, pigmented spot. 



Antenna, (fig, 13) slender, one fourth the length of head, distally 

 almost reaching the anterior end of the head, three jointed, with 

 basic articulating membrane extremely large, permitting a very free 

 motion of the entire antenna ; articulating-membrane reaching from 

 external part of base of mandible more than half way to the ocellar 

 spot; basal joint short, cylindrical, with width about twice the diam- 

 eter of the mandibular condyle, and length about half the width ; sec- 

 ond joint cylindrical, three fourths the width of basal joint, three 

 times as long as wide, distally and externally with a very low, round, 

 convex supplemental^ appendix and a few minute setae; apical joint 

 half as thick and almost as long as the second joint, distallj'^ with a 

 few short setae and one macrochaeta, which is about twice as long 

 as all antennal joints together. 



Mandible, falcate, basically enlarged, gradually attenuate, strongly 

 incurved, about half as long as the lateral outline of head from 



