354 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxi. 



reflexed, a little rounded, with a pair of short, blunt projections, 

 close together at the middle; frons rather more sparsel}" punctured 

 than the clypeus, bearing long, black hairs; vertex and cheeks rather 

 coarsely, sparsel}" punctured; near the upper, inner angle of the e3'e, 

 on a line drawn through the median and a lateral ocellus is a large 

 puncture with a macroclnvta; cheeks nearly the width of the eye, 

 densel}^ clothed l)eIo\v with long, black hairs; inner margins of the 

 eyes parallel or nearly so; antennas black, the scape with long, black 

 hairs; first segment of the filament nearly one-third longer than the 

 second which is slightl}" longer than the third; mandil)les two toothed, 

 the latei'al tooth l)lunt and with a groove running back toward its l)ase 

 from a centi'al notch at its edge; a nearly obsolete ferruginous ])and 

 crosses the mandi))le near the base of the teeth. 



Thorax. — Collar sparsely punctured; prothoracic lobe fringed 

 behind with short, pale hairs; mesonotum with a median impressed 

 Imnd anteriorly, extendmg about one-third the length of the plate; 

 the remainder rather more closely punctured than the collar and cov- 

 ered with erect, black and pale hairs; a trace of a parapsidal groove 

 is present; scutellum and postscutellum sraoothl}- rounded, without a 

 median depression, sparsely punctured; median segment closely punc- 

 tured, clothed particularly at the sides and l)ehind with long, black, and 

 pale hairs; in some lights a faint trace of an impressed line from the 

 hind coxa to the stigma may be seen; sides of the thorax quite closely 

 and evenly punctured, bearing long, black, and a few pale hairs; 

 petiole less than twice the length of the posterior coxa, slightly 

 curved, bearing minute punctures less abundant toward the abdomen, 

 thinly clothed with long, pale hairs. 



Ahdoiiien. — Black, glistening, with a few scattered, ))lack hairs 

 toward the posterior end; beneath glistening, with a few scattered 

 punctures and l)lack hairs, mainly on the terminal plat(\ 



Wnujx. — Dark fuliginous with a blue or violet refiection; radial cell 

 rather bluntly rounded at the tip; discoidal vein of the hind wing 

 interstitial. 



LegR. — Black, glistening; the femora with scattered punctures and 

 hairs; hind tibia? strongly brownish sericeous behind. 



Additional features from other specimens. In some cases there is a 

 trace of silvery pubescence on the sides of the clypeus and the impressed 

 line from the hind coxa to the stigma of the median segment is more 

 evident, being almost a stigmatal groove. In a specimen from Para- 

 guay the tibia? and metatarsi have a slight brown tinge. 



Mala. — Head thickl}' clothed with long black and gray hairs; 

 clypeus long, strongl}' arched laterall}^ its anterior margin slightly 

 rounded and with a faint notch at the center; covered with a sparse, 

 silvery-white pubescence which extends up on the frons to the attach- 

 ment of the antenna?; tlie surface of the frons closely, quite coarsely 



