STILOCHARIS.—DERODERUS. 577 
right quadri-dentate. The labrum ample, with two small denticles in the middle 
separated by a slight excision. The prosternal process rests on the front of the meso- 
_ Sternum, and the side pieces are rather large. Although the oblique elongation of the 
thorax on either side is greater than in Medon, yet it is not so great as in Deroderus. 
1. Stilocharis longula. (Tab. XV. fig. 1.) 
Elongata, angustula ; nigro-fusca, capite vix subenescente, antennis, pedibus elytrisque fuscis ; dense subtiliter 
punctulata. 
Long. 53 millim. 
Hab. GuatemMaua, Capetillo, Zapote, Quiche Mountains 7000 to 9000 feet 
(Champion). 
Antenne rather short, not stout; third joint scarcely longer than the second, the 
penultimate scarcely so long as broad. Head oblong-oval, the eyes small; surface finely 
and very densely punctate, the punctuation definite in front, quite indistinct behind, the 
pubescence very fine and short. Thorax elongate, rather longer than broad, straight at 
the sides, finely and extremely densely punctured, with a rather indistinct fine line down 
the middle smooth. Elytra rather longer than the thorax, extremely densely and finely 
punctured. The male is distinguished by a very feeble emargination of the hind margin 
of the last ventral plate. 
A series of twelve examples; the three specimens from the Quiche Mountains form 
a variety of slightly smaller size, with the elytra only about as long as the thorax. 
DERODERUS. 
Corpus subdepressum. Labrum bidenticulatum. Caput collo perangusto. Tarsi breves, crassiusculi; anteriores 
haud dilatati, posteriores articulo basali parum elongato. 
This is intermediate in most respects between Stilocharis and Stilicus, but the tarsi 
are shorter and broader than in either of those genera. The labrum is ample, and has 
two short denticles in the middle. The left mandible is tri-, the right quadri-dentate, 
the basal tooth being in each case very small. ‘The neck is not quite so slender as in 
Stilicus. In the typical species, D. vestitus, the sculpture is wholly unlike, but in 
the aberrant D. difficilis it is similar to, that of Stzlécus. 
I am not acquainted with any species other than those here described. 
1. Deroderus vestitus. (Tab. XV. fig. 2.) 
Fusco-rufus, capite nigricante, opacus, subtilissime punctatus, pube brevissima erecta dense vestitus; elytris 
punctis majoribus impressis parum distinctis. 
Long. 6 millim. 
Hab. Panama, Bugaba (Champion). 
Antenne short, dark red, the third joint a little longer than the second. Head sub- 
circular, excessively finely and densely punctured and pubescent, quite dull; eyes small. 
BIOL. CENTR.-AMER., Coleopt., Vol. I. Pt. 2, August 1886. 4 EE 
