AMERICAN COLEOPTERA. 85 



is smooth and shining. The space transversely wrinkled bears some 

 few bristles, more numerous on the sides. On the upper portion of 

 the head I perceive six bristles, three disposed in a triangle, on each 

 side of the i^^-shaped line. 



Epistoma trapezoidal; lahrum semicircular, its upper coriaceous 

 covering trisinuated anteriorly, with two small projecting lobes be- 

 tween the lateral sinuses; the lower, fleshy part is armed, as usual 

 with minute, stout, erect bristles. Epistoma and labrum reddish- 

 brown. 



Antennx three-jointed (not counting the scapus), but little advanc- 

 ing beyond the tip of the mandible; first joint subcylindrical, long; 

 the second cylindrical, about f of the length of the first; tiie third 

 very small, about } of the length of the second and much more 

 narrow. 



Mandibles horny, very strong, dark brown or black, more reddish 

 towards the basis, projecting but little beyond the labrnm. When I 

 first examined the larva, I found both mandibles looking alike, tri- 

 angular, slightly curved towards the inside at tip, with a small tooth 

 on the inside of the broad basis. I soon perceived however that the 

 mandibles had not yet thrown off their old covering during the moult, 

 and I easily removed from the left mandible, a horny shell, which after 

 removal, preserved its former appearance. The mandible disclosed 

 under it shows an altogether different structure, (compare fig. 3. a). 

 It consists of a stout, reddish-brown horny basal piece, with a black, 

 double tooth on the inside; on this basal part a black, horny, almost 

 cuitriform piece is inserted, slightly convex and longitudinally furrowed 

 on the outside (the tip being smooth); concave and likewise with 

 numerous longitudinal furrows inside. Between these two pieces the 

 mandible shows an excision, in the shape of an angle of about 45°. of 

 which there was no trace in the same mandible before moulting. The 

 right mandible is probably of the same structure, but I did not re- 

 move its old skin; an opening in it however allows a partial view of 

 the new mandible within. 



MaxiUse, (fig. 3) with two lobes; the outer and upper one small, 

 cylindrical, with a few short spines and with a small conical, homy, 

 piece at the tip, attached by an articulation ; the inner and lower lobe 

 is a little larger and beset with numerous spinelike bristles, and ha^, 

 at the tip, a similar horny, but more unguiform, piece. Maxillnrij pnlpi 

 apparently 3-jointed (besides a small ba.sal piece), projecting but little 

 above the maxillae; joints about equal in length. 



