AMERICAN COMPONENTS OF THE TENTYRIIN^ 367 



before the middle ; last antennal joint elongate, sometimes ex- 

 tremely so. [TyjDC Trimytts abtiormis Horn] Chilometopon "Vl 



All of these genera have the eyes very coarsely faceted, the 

 epistoma greatly prolonged, subquadrate and clasped by the 

 external ridge of the mandibles, the latter bifid at tip, the max- 

 illary palpi well developed, with the last joint wider, elongate 

 and obliquely truncate, the antennas elongate and filiform, with 

 the last three or four joints wider, the scutellum well developed, 

 the elytra punctured in series, the tibiae straight, the anterior 

 with uneverted external angles and the tarsi sparsely clothed 

 beneath with stiff inclined spiniform hairs. One or possibly two 

 of the genera described by Mr. Champion in the " Biologia," will 

 enter this tribe, no\.?i}o\y Pescennms, which Horn regards merely 

 as a hairy Trimytis; it is however a widely distinct genus. 



Trimytis Lee. 



The species of this genus are rather short and compact in 

 build, very convex, reminding us somewhat of Steriphanus, of 

 the Eurymetoponini, and, as in that genus, the base of the pro- 

 thorax may be either lobed or transversely rectilinear. The 

 elytra are always margined at base, the scutellum transverse, 

 broadly truncate and not projecting posteriorly behind the raised 

 margin, differing in this way from the other two genera. Tf'i- 

 mytis may be separated into two very distinct groups, which 

 may be i-egarded at present as subgenera, as follows : — 



Mandibles short, obtuse, not at all dentate above near or beyond the 

 middle, folding under the labrum and clasping only the epistomal 

 lobe, which is abruptly and squarely truncate at tip ; prothorax 

 transversely subrectilinear at base ; tarsi rather short, the basal 

 joint of the posterior distinctly longer than the fourth. \Triniy- 

 tis in sp.] 2 



Mandibles stout, with the apex abruptly narrowed and deflexed, each 

 with a porrect dorsal tooth, moderate on the left, strong on the 

 right, both clasping the labrum and lying against the epistoma 

 when closed, the latter semicircular in form, with its edge finely 

 pectinate \n pulverea^ angulate in obtzisa ; prothorax of the same 

 general form but distinctly lobed at base ; tarsi short, the basal 

 joint of the posterior subequal to the fourth. \^Piinalius n. subg. 

 — type ptilverea Horn] 6 



2 ^Epistoma minutely and sparsely punctate. Body very stout, 

 highly polished, deep black, the under surface picescent, the legs 



