ASTROTUS.—SICHARBAS. 67 
3. Astrotus seticornis. (Tab. II. fig. 20.) 
Oblong oval, depressed above, dark reddish brown, clothed with brown scaly hairs, pubescent. Prothorax as 
long as broad, or subtransverse, the lateral margins a little reflexed and strongly rounded, and narrowed 
and sinuate before the base, hind angles rather obtuse and subrectangular, narrowed and feebly sinuate in 
front, the anterior angles prominent, slightly produced and triangular, base bisinuate, and the central lobe 
a little produced and rounded, surface finely and very closely punctured, with an indistinct smooth central 
groove, obsolete in front, and a rounded impression on each side before the middle; elytra depressed, 
narrow at the base, as wide as the thorax, emarginate at the shoulders, widening a little to beyond the 
middle, then abruptly narrowed, and the apex a little produced and rounded, with a sharp marginal ridge 
turning inwards before the apex, a short sinuous dorsal ridge at the base, the suture a little raised, a 
distinct y-shaped elevation on each side about the middle, and several curved or transverse elevations 
behind, surface very finely and closely punctured; anterior tibize with a sharp tooth at outer apical angle ; 
antenne long, apparently 10-jointed, the eleventh joint short, very small, sunk in the tenth, and slightly 
rounded at apex, third to ninth decreasing in length, moniliform, all the joints with a few short, stout, 
projecting bristly hairs. Beneath very closely and finely granulose ; epipleural fold narrow, rather distinct ; 
intermediate coxal cavities almost closed externally, trochantin very small. 
Length 8-9 millim. 
Hab. Mexico (coll. F. Bates), Toluca (Sallé). 
Var. humeralis. 
Similar to A. seticornis, but a little larger, more densely clothed with (light brown) scales; the thorax more 
strongly rounded and sinuate at the sides, and the hind angles and central lobe a little more prominent ; 
the humeri rounded and scarcely emarginate, &c. 
Hab. Mexico, Toluca (Sallé). 
This species, though differing greatly from typical Astrotus in the structure of the 
antenne, is perhaps better placed here for the present; it may possibly form a new 
genus. 
SICHARBAS. 
Mentum transverse, completely filling the gular cavities, and contiguous to the mandibles ; ligula hidden; last 
joint of maxillary palpi large, subtriangular; labrum transverse, prominent, passing the mandibles ; 
epistoma broad, truncate in front; lateral margins of the front raised, a little swollen and rounded; 
antenne with long bristly hairs, long, apparently 10-jointed, the last two joints subconnate, large, and 
slightly pointed at the apex, third twice as long as the second, fourth to ninth decreasing in length, and 
obconic; prothorax long, the hind angles much produced and lobiform; elytra subparallel, flattened 
nearly to the apex, then abruptly declivous, with the apex produced and rounded; epipleure vertical, 
broad, a little raised along the inner margin; intermediate coxal cavities open externally, trochantin 
visible, small; intercoxal process broad, subtruncate in front, slightly raised in the middle; tarsi with 
long silky hairs beneath, not sulcate ; anterior tibiz with a sharp tooth at outer apical angle. 
Founded on a Mexican species captured long ago by Truqui. Somewhat allied to 
Astrotus seticornis in the structure of the antenne, but I think generically distinct. 
1. Sicharbas lobatus. (Tab. II. fig. 23.) 
Elongate, rather convex, depressed above, dark reddish brown, densely clothed with light brown scales, slightly 
pubescent. Head with a slight longitudinal impression between the eyes; prothorax as long as broad, 
widest towards the front, widened from the anterior angles nearly to the middle, then suddenly narrowed 
to the base, the hind angles much produced, lobiform, rounded at the apex, curved a little outwardly, and 
overlapping the elytra, anterior angles a little produced and obtuse, base with a rounded central lobe, and 
KK 2 
