118 A. MATTHEWS. 



Ht. iiicerta n. sp. — L. c. .87 mm. — Elongate, narrow, convex, shining, spar- 

 ingly clothed with very short yellow hair; head rather long, obtuse in front; eyes 

 placed far back, rather large and prominent ; thorax small, rather wider, but not 

 longer than the head, widest near the middle, strongly constricted near the base, 

 coarsely tubereulate, with an oval impression on each side near the scutellum ; 

 sides margmed, rounded in front, and constricted near the base; basal margin 

 nearly straight, with the angles acute and prominent; elytra long and narrow, 

 sub-parallej ; longer, but scarcely broader than the head and thorax ; convex, 

 shining, closely and coarsely asperate; apex much rounded, concolorous, with the 

 edge white ; abdomen with four segments exposed with the apical and half of the 

 penultimate segment yellow, apex acute; legs and antennae long and yellow. 



Differs from other species in its narrow sub-parallel form, strongly con- 

 stricted thorax, dark castaneous color and deep sculpture. 



Hah. — San Geronimo, Gruatemala, at an altitude of 3000 feet, Mr. 

 Champion. 



Qfjs. — I feel doubtful whether this insect is a true Ptinella ; it differs 

 much from the more normal species in its convex and corneous integu- 

 ment, but as far as I have been able to discover it does not present any 

 anatomical difference. 



€HAMI»IOWEL,L,A n. g. 

 Antennae 11-jointed, 1-2 large cylindrical, 2 rather larger than 1, 3-7 

 nearly equal, 8 longer, and somewhat incrassated, 9-11 incrassated, 

 gradually increasing in length and breadth. 

 Palpi maxillary rather large, 4-jointed, penultimate joint longer than 



the preceding, cyathiform, terminal joint acicular long and sinuated. 

 Labial 3-jointed, short and robust, 2 narrower than 1, with a long di- 

 vergent setae at the exterior apical angle, 3 ovate. 

 Lingua broad, with the apex obtuse and dentate. 

 Labium moderate, with the apical margin concave, paraglossae almost 



rudimentary. 

 Mentum rather large, oblong, with the sides slightly concave, with two 



small setae near each anterior angle. 

 Mandibles rather large and robust, with the apex acute, slightly hooked, 

 minutely dentate on the back. Lamella memhranacea. small, nearly 

 circular. Stipes large, produced into a long, very acute, curved pro- 

 cess behind the mandible, and furnished with a small sinuated process 

 near the base. 

 Maxilla 3-lobed, outer lobe corneous, formed by a long, pointed, incui-ved 

 process of the stipes ; middle lohe coriaceous, short and broad, 2- 

 jointed, furnished at the apex with a long brush of strong set^e ; iiuter 

 lohe corneous, large and robust, armed at the apex with three long and 

 strong incurved teeth. 



