80 SILPHIDA. 
basal margin nearly straight, with the edge pale and the angles nearly right angles. Scutellwm small, 
triangular, obtuse, and smooth. lytra almost semicircular, rather longer and rather broader than the 
head and thorax, widest near the middle, microscopically punctulate, the sides much rounded and slightly 
margined, Legs rather short, rufo-testaceous ; tibia spinose externally and armed with strong spurs ; 
tarsi 3-jointed. (Obs. This is the description of a posterior leg; all the rest are missing.) Underparts 
wholly black. 
Hab. GuateMALa, Senahu (Champion). One specimen. 
I have been induced to place this insect in the present genus from the similarity 
which it bears to the preceding species in its general external appearance; and from 
the facts that the only leg it possesses has a three-jointed tarsus, and that the seven 
remaining joints of its one antenna correspond to those of Aglyptus more closely than 
to those of any other genus of this tribe. But with such imperfect material it is diffi- 
cult to determine its generic affinities with any accuracy. 
SCOTOCRYPTUS. 
Scotocryptus, Girard, Bull. Soc. Ent. Fr. (5) iv. p. ev, and Ann. p. 574 (1874); Sharp, Compt. Rend. 
ent. Soc. Belg. 1885, pp. xxi & xxii (1885) ; Horn, Entom. Amer. i. p. 51 (1885). 
Body entirely hemispheric. Head sessile, short and broad; clypeus distinctly marked, corneous; antennal 
grooves very distinct. Z'horax very short, transverse, with the sides and front continuously rounded. 
Scutellum triangular. LElytra large, entire; epipleural fold broad. Antenne arising beneath the frontal 
plate, 11-jointed, joint 1 long and robust, 2 smaller than 1, 3 slender, longer than 2, 4 shorter than 3, 
5 and 6 of the same shape as 4, 7 very large, 8 smaller than 7, 9-11 forming a slightly incrassated club, 
11 the largest, obtusely pointed. Palpi: mawillary short and very robust, 4-jointed, 1 very small, 2 much 
larger, trsnsverse, 3 twice as long as 2, but not broader, 4 nearly as long as 3, obtusely pointed ; labial 
short and robust, 3-jointed, 1 rather short, 2 longer, 3 obtusely conical. Labrwm very short and broad, 
with the basal angles produced ; sides rounded, slightly hollowed in front, and furnished with a few very 
short sete. Mandibles large, short and stout, very sharp at the point, armed immediately below the point 
with a large and very sharp tooth; base very broad and much incrassated. Mawille short and robust, 
bilobed : ewtertor lobe short and broad, 2-jointed; basal joint short and rounded ; terminal joint setose at 
the extremity ; inner lobe large and broad, with the apex obliquely truncate and furnished with long 
sete ; stipes very robust. Mentum very short, transverse, subquadrate, widest at the base; submentum of 
the same shape inversed, armed at its base with two very long, straight, and very sharp spines, rather 
more distant from each other than from the sides of the submentum. Jabiwm short and broad, produced 
between the palpi into a broad triangular point. Inngua large, quadrate, furnished in the middle of its 
anterior margin with short sete. Prosternwm rather short, elevated between the coxe into a very thin 
carina ; episterna very small and narrow ; epimera moderate, not extending behind the cavities; coxal 
cavities very large, open in front and behind. Mesosternum very short, elevated between the coxe into a 
small lanciform plate; episterna rather large, humeral ; epimera moderate, much elongated anteriorly, 
reaching to the coxal cavities; coxal cavities very large, oval, extending far into the metasternum, with 
a large foramen at the outer extremity. Metasternwm very short, extending to the sides of the body, and 
produced between the posterior cox into a small quadrate plate, the plate pointed at each of its extremities 
and divided from the metasternum proper by a distinct suture ; episterna and epimera small and narrow, 
concealed by the elytra, with the incurved apex of the latter alone visible ; coxe very large, pyriform and 
oblique, not extending to the sides of the body. Venter composed of five segments; the basal segment the 
longest, and elevated on each side into a very large triangular smooth plate. Zegs short and robust: 
anterior femora laminated on the inner side ; tibie slightly dilated towards the apex, armed with a single 
strong spur on the outside near the apex; tarsi rather short, 3-jointed, 1 twice as long as 2, and 
