314 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxi. 



Female. — Head ])roader than distance between outer ed^es of 

 te<i'ula'. narrow from front to rear; clypeus less than half as long- as 

 wk1(\ its middle elevated, forming a ridge narrowest behind, broad- 

 ening anteriorly; posterior outline of clypeus somewhat emarginate 

 near the middle of each side, extending l)elow the eye to the base of 

 the mandible; anterior edge l)lackish, with tive blunt teeth, the lateral 

 one farther from the three near the center than these are from each 

 other (the number of these teeth is subject to individual variation, and 

 I have seen one specimen with none); surface of clypeus rather 

 sparsel}^ coarsely punctured, bearing black hairs, some near the ante- 

 rior edge l)eing quite long; least hairy near the posterior emarginations-, 

 frons with a more or less evident median elevation from the antenna? 

 part way to the median ocellus, this region being" quite closely, coarsely 

 punctured and sometimes slightly rugose; surface of frons hollowed on 

 each side of the elevation, most deeply so at the clj^peus; above and 

 between the antennae the surface is slightly rugose; surface of frons 

 more or less punctured, the punctures vaiying in size and abundance in 

 different specimens; bearing numerous short, black hairs, best seen in 

 profile; median ocellus largest; on the inner side of each lateral ocellus 

 is a long, black hair (macrocha^ta)and nearer the occiput is a second pair 

 farther apart; behind the ocelli is a faintly marked transverse oval 

 elevated area at the ends of which the posterior pair of macrochtetre 

 lie; surface of vertex and occiput with punctures varying in size and 

 abundance; cheeks quite broad above, narrowing rapidly below; above 

 with scattered punctures which become larger and closer below where 

 there are numerous long, black hairs; a row of black hairs is present 

 on the edge of the occiput; inner margins of the compound eyes con- 

 verging above, parallel on their lower half; their lower edges nearly 

 at right angles to their inner ones; antenna?; scape black, glistening 

 somewhat, sometimes metallic like the body; remainder })rownish 

 sericeous; the scape has rather coarse punctures and numerous short, 

 stout hairs except externally; first segment of filament longest, some- 

 times slightly sw^ollen near its tip, which is surrounded ))y a number 

 of minute, black hairs, also present on the second, and sometimes on 

 the third and fourth segments; mandil)les with two teeth, the terminal 

 one forming half the length of the mandible; anterior tooth blunt; a 

 ridge extends from the base outward and soon forks, a branch passing 

 along each tooth; in the space behind each of these ridges the surface 

 is somewhat aciculated; the anterior tooth and the ventral side of the 

 mandible bear scattered black hairs; color of the mandibles black 

 except for a dull ferruginous area near the junction of the teeth in 

 some cases, and a slight ferruginous tinge near the edges. 



Thorax. — Collar rather narrow, its sides and posterior face quite 

 vertical, not closely appressed to the mesonotum; anterior face quite 

 vertical below, rounded or sloping backward above; dorsal edge and 



