100 SILPHID. 
This genus has been, I think properly, separated from Choleva by the great compa- 
rative differences which exist in the external skeleton of the underside: the most 
conspicuous of these are the size of the prosternum, the shape of the mesosternum, 
which latter separates the coxal cavities by a carinal elevation, and also differs in the 
form of its side-pieces, and the large size of the metasternum. Ptomaphagus also 
differs from Choleva in the sculpture and outline of the elytra, which are seldom 
perfectly entire at the apex. 
Of these differences the most conspicuous is the elevation of the mesosternum between 
the intermediate coxe. 
1. Ptomaphagus forticornis, sp.n. (Tab. Il. fig. 9.) 
Oblongo-ovatus, sat angustus, castaneus, pilis brevibus aureis vestitus, per totum confertim strigose punctatus ; 
capite sat magno, ore valde producto; oculis magnis, prominentibus ; pronoto subquadrato, quam caput sat 
longiore et latiore, ad basin latissimo, lateribus leviter marginatis, margine basali leviter sinuata -angulis 
rectis; elytris longis, quam caput atque pronotum fere duplo longioribus, vix latioribus, prope humeros 
latissimis, stria suturali sat profunda impressis, lateribus marginatis, apice valde obtuso ; pedibus longis, 
gracilibus, castaneis; antennis castaneis, clavis obscurioribus, sat brevibus, robustis, articulis 5° et 6° 
perbrevibus, transversis, clavis leviter incrassatis. Long. corp. 1¢ lin. =3°50 millim. 
Body oblong-ovate, rather narrow, castaneous, clothed with short golden pubescence, on all parts closely and 
strigosely punctate. Head rather large, the mouth much produced; eyes large and prominent; antennx 
rather short and robust, castaneous, with the club dusky, the fifth and sixth joints very short, transverse, 
the club faintly incrassated. Thorax subquadrate, rather longer and broader than the head, widest at the 
base; sides slightly margined; basal margin faintly sinuated, with the angles rectangular. Scutellum 
small, triangular. Hlytra long, scarcely broader but almost twice lenger than the head and thorax, 
widest near the shoulders, with a rather deep sutural stria ; sides margined ; apex very obtuse. Legs long 
and slender, castaneous; tibiw spinose. Underparts castaneous; mesosternum strigose, with the carina 
strongly elevated. 
Hab. Muxico, Cordova (Sallé). 
2. Ptomaphagus consobrinus. 
Catops consobrinus, Lec. Proc. Ac. Phil. 1853, p. 281°. 
Ptomaphagus consobrinus, Horn, Trans. Am. Ent. Soc. vill. p. 263°. 
Obtuse conieus, angustus, leviter depressus, pallide castaneus, pube aurea vestitus; per totum confertim et sat 
profunde strigosus, strigis elytrorum obliquis; capite magno, lato, sat nitido, ore modice producto; oculis 
sat parvis, haud prominentibus ; pronoto modico, quam caput sat longiore atque latiore,ad basin latissimo, 
lateribus marginatis, margine basali fere recta angulis acutis; elytris postice attenuatis, quam caput atque 
pronotum vix latioribus, duplo lengioribus, ad humeros latissimis, lateribus vix rotundatis, marginatis, 
apicibus rotundatis, valde obtusis ; pedibus longis, gracilibus, rufo-castaneis, tibiis simplicibus, tarsis longis, 
anterioribus dilatatis; antennis modicis, rufo-piceis, articulis duobus basalibus flavis. Long. corp. 17 lin. 
= 2°50 millim. 
Body obtusely conical, narrow, slightly depressed, pale castaneous, clothed with golden pubescence, on all parts 
closely and transversely strigose, with the strige on the elytra oblique. Head large and broad, rather 
shining, the mouth moderately produced; eyes rather small, not prominent. Zhorax moderate, rather 
longer and broader than the head, widest at the base; sides margined ; basal margin almost straight, with 
the angles acute. Scutellum moderate, triangular. Hlytra rather attenuated posteriorly, scarcely broader 
but twice longer than the head and thorax, widest at the shoulders; sides scarcely rounded, margined ; 
