12(» A. MATTHEWS. 



PTERVCOOES n. g. 



Antennae 11 -jointed, 1-2 very large, 2 rather smaller than 1, con- 

 stricted near the apex, 3-8 very long and slender, constricted near the 

 base and apex, 9 faintly incrassate, 10 much longer and wider than 

 9, largely incrassate at the base, and very slender towards the apex, 

 11 much longer and wider than 10, obtusely conic, the three terminal 

 joints ornamented with a score of rather short setae. 



Palpi, Maxillary rather small, 4-jointed, penultimate joint ovate, 

 truncate, terminal long, acicular and sinuated, with a long seta on each 

 side before the middle. 



Labial very large and long, 3-jointed, basal joint very large, cylindric, 

 2 also eylindric, but more than twice smaller than the preceding, 3 

 much shorter and smaller than 2, acutely conic. 



Lingua long and narrow, concave in the middle, and produced on each 

 side near the exterior angle into a short aciculated point, with a short 

 divergent seta on each exterior angle. 



Labium rather large with the anterior edge nearly straight; paraglossae 

 robust, erect, acute, with a long divergent seta on the outer side near 

 the apex. 



Mentum oblong, with two strong setae on the outer side of each ante- 

 rior angle. 



Mandibles moderate, rather hooked, moderately dentate at the back. 

 Lamella memhranacea moderate, almost circular. Stipes rather small, 

 produced into a long, robust, curved process behind the mandible. 



Maxillae 3-lobed, outer lobe corneous, formed by a long, robust, pointed 

 process of the stipes ; middle lobe coriaceous, 2-jointed, furnished at 

 the apex with a brush of long, strong, setae j inner lobe corneous, 

 placed much below the middle lobe, rather small, armed at the apex 

 with five or six sharp curved teeth. 



Labrum rather large, semi-oval, slightly constricted before the middle 

 with three strong setae on each side, and a curved row of smaller setae 

 beyond the middle of the disk. 



Head large and prominent. 



Pronotum large, slightly constricted near the l>ase. 



Scutellitm triangular. 



Elytra rather long, truncate. 



Abdomen moderately long, with three segments exposed. 



Prosternum moderate, falcate ; rpisterua small, distinct ; ejnmera 

 rather large ; coxal cavities broadly enclosed behind. 



