PROC. ENT. SOC. WASH., VOL. 23, NO. 3, MAR., 1921 55 



tooth (t fig. 18). Lateral exterior mandibular portion (1 figs. 13 and 18) subtrian- 

 gular, flat, punctate and wrinkled, limited by two apically converging carinae 

 from base of mandible to scissorial portion; with several setae. Manducatorial 

 ( = mola bearing) portion dorsally and ventrally somewhat convex, smooth and 

 shining, separated from scissorial portion by oblique impression declining 

 towards outside of mandible. Stridulating area elliptical, on right mandible 

 twice, on left two and a half times as long as wide, densely set with minute 

 asperities (figs. 3, 4 and 13), regularly arranged in fine, parallel lines. Right 

 molar part oblique, anteriorly low, posteriorly prominently projecting, sloping 

 gradually downwards from the upper part of crown to the heel; crown ( = corona) 

 (figs. 8 and 24) bicarinate, transversely trilobed with one small anterior (cr 1 

 fig. 24) and two large posterior lobes (cr 2 and cr 3) ; anterior lobe rounded, almost 

 globular, limited by neckshaped narrowing; both posterior lobes fungiform and 

 obtusely carinate; heel ( = calx) (fig. 8 and ca fig. 24) strong, with flat, granulose 

 surface, transverse, subtrapezoidal, about twice as broad as long, posteriorly 

 truncate and emarginate with dorso-posterior angle (a fig. 24) developed as a 

 short, broad, obtuse process about as long as wide, and only slightly projecting 

 over a large, rounded, deeply excavate, dorsal portion of the bristle bearing 

 base (bb fig. 24). Left molar part (figs. 9, 10 and 25) anteriorly prominent, 

 posteriorly retracted; crown bilobed, anterior lobe (L 1 fig. 25) strong, fungiform, 

 crenulate along free margin, shielding deep excavation, which receives poster- 

 ior carinated lobe of right mola (cr 3 fig. 24); posterior lobe of left mandible 

 frontally carrying an obtuse, transverse carina (L 2 fig. 25) between one strong 

 dorsal and one less developed rounded ventral tooth; heel (Ca fig. 25) rather 

 small, slightly concave, anteriorly limited by a low transverse carina, coming 

 from a broad, dorsal, piliferous hook ( = hamus) (H fig. 25) and disappearing to- 

 wards ventral tooth of posterior lobe; bristle bearing base (Bb fig. 25) pos- 

 teriorly with obtusely conical outline, and anteriorly almost contiguous with 

 grinding surface of heel. 



Maxillary lobes ( = lacinia and galea) fused into a single, solid, conico-quad- 

 rangular, slightly depressed, setose structure; ventrally (fig. 6) with surface 

 entirely plain, dorsally (fig. 14) with a rather deep, longitudinal sulcus, which is 

 the limiting line between the areas of the exterior and interior lobes; exterior 

 lobe ( = galea) with single, terminal, curved and very strong tooth ( = uncus) 

 (gt fig. 17); interior lobe (lacinia) with two strong, conical teeth (It 1, It 2 fig. 

 17); long and strong, conical setae on dorsal side along bases of teeth; two strong 

 conical setae (vs fig. 17) on the ventral side of bases of teeth; a single, short, 

 strong seta (ps fig. 17) posteriorly to second lacinia-tooth. 



Stipes, with Stridulating teeth (figs. 14 and 21) on dorsal side, about six, 

 slender, pointed and recurved; dentiferous carina apically curvilinear, with 

 obtuse tubercle. 



Maxillary palp (fig. 6), projecting beyond exterior maxillary lobe by half the 

 length of the apical joint; four-jointed; basal joint short, obconical; second joint 

 three times as long as basal joint; subapical joint three fourths the length of 

 second joint; apical joint as long as second joint and obovate. 



Epipharynx, (fig. 7) membranous, densely set with short spinules on each side 

 of a nude, fleshy ridge along the middle line; four, pointed teeth asymmetrically 

 placed near anterior margin. 



