SIBINTA. 209 
Form broad-ovate; vestiture of the upper surface ochreous and white, mottled or 
tessellate with brown ; elytral strie fine . . . . . . . Species 3. 
Form broad-ovate ; vestiture uniformly greyish-white ; elytral strie fine . . . Species 4. 
Form ovate or subovate ; elytral striz fine (broader in S. americana). 
Prothorax with two broad vitte, and the elytra with interrupted lines and an 
antemedian fascia, purplish-brown . 2 . 1. ee ew ee Species 5. 
Prothorax without vitte, the elytra not fasciate. 
Elytra squamose and with semierect sete, the vestiture uniformly greyish or 
ochreous... . ww ek kk kk kk Species 6, 7. 
Elytral vestiture piliform, with intermixed white scales, at least along the 
suture, the sete absent . . . . . 1... ee ee ee ee Species 8, 9. 
1. Sibinia rubescens, sp. n. 
Oblong-ovate, black, the tip of the rostrum, the antenne (the club excepted), and tarsi ferruginous or obscure 
ferruginous ; thickly clothed above with elongate scales, which are mostly of a rusty-red colour, inter- 
mixed with white, the squamosity of the scutellum entirely whitish, the scales on the elytra arranged 
in a single row on each stria and a double row on each interstice ; the legs and under surface densely 
squamose, the scales white intermixed with fulvous. Rostrum about as long as the prothorax, feebly 
curved, stout at the base, tapering at the tip, seriate-punctate, bare at the apex. Prothorax transverse, 
rounded at the sides, strongly sinuate at the base, narrowed behind as well as in front, constricted before 
the apex, closely punctate. Elytra much wider than the prothorax, subparallel towards the base, 
separately rounded at the apex; deeply striate, the striz broad and finely punctured, the interstices flat 
and rugulose. Pygidium narrowly exposed. Legs short and rather stout. 
Length 23, breadth 1} millim. 
Hab. Mexico, Durango city (Hoge). 
One specimen. Very like Tychius simplex, Casey, from Texas and Arizona, but 
larger, the prothorax more rounded at the sides, and the vestiture of the upper surface 
in great part rusty-red, the dense squamosity of the under surface not uniformly white. 
The funiculus (as in 7’. simplex) being 6-jointed and the elytra separately rounded at 
the apex, the species seems best placed in Sibinia. 
2. Sibinia rotundata, sp.n. (Tab. XII. figg. 4, 4.) 
Broad-ovate, robust, convex, black, the head, the tip of the rostrum, the antenne, and tarsi ferruginous ; 
thickly clothed with oblong-oval, imbricate scales, those on the prothorax ochreous and blackish, with a 
few white ones intermixed on the disc and at the middle of the base; the vestiture of the elytra in great 
part ochreous, with the suture to near the tip and a narrow curved space before the apex black, shading 
off into brown, the alternate interstices each with a few scattered white scales, and the suture also 
whitish at the tip; the squamosity of the rostrum, legs, and under surface whitish or ochreous, that of 
the ventral surface entirely whitish. Rostrum curved, a little longer than the prothorax, stout, tapering 
at the tip, seriate-punctate, bare at the apex, the antenne inserted about the middle. Prothorax trans- 
verse, rapidly narrowing from the base, which is strongly sinuate, slightly rounded at the sides anteriorly 
and constricted in front, densely punctate. Elytra much wider than the prothorax, narrowing from a 
little below the base, broadly rounded at the apex, with the sutural angles slightly dehiscent ; finely 
punctate-striate, the interstices densely rugulose. Pygidium covered by the elytra. Fifth ventral 
segment arcuate-emarginate at the apex. Legs short and stout. 
Length 21, breadth 13 millim. 
Hab. Panama, Volcan de Chiriqui (Champion). 
BIOL. CENTR.-AMER., Coleopt., Vol. LV. Pt. 4, May 1903. 9EE 
