BIDESSUS. 25 
punctate near the suture, elsewhere almost impunctate, without any trace of sutural 
stria, but with an obsolete discoidal stria, the basal impression broad but short, scarcely 
so long as that on the thorax; they are yellow in colour, but have each two broad dark 
straight lines extending from the base to near the apex, where they are quite united ; 
between the inner of these lines and the suture there is a rather shorter dark line, which 
is frequently joined to the inner line so as merely to increase the breadth of the latter ; 
the suture also is black, and is separated only by a very narrow space from the black 
mark near it. 
This species has the tarsi quite slender ; and I can see no sexual distinctions. It should 
be placed between Hydroporus pullus, Lec., and the South-American Bidessus discoidalis, 
Sharp. 
17. Bidessus elongatus. (Tab. I. fig. 7.) 
Suboblongus, angustulus, subparallelus, rufo-testaceus, elytris fuscis testaceo-signatis ; prothorace basi utrinque 
stria curvata sat elongata; elytris sine impressione basali, opaculis, obsolete punctatis tenuiterquo 
pubescentibus. 
Long. 12, lat. 3 lin. 
Hab. GuatEMALA, Paso Antonio, 400 feet, and Torola, 1000 feet (Champion). 
Antenne yellow, rather elongate and slender. Head and thorax clear yellow; the 
latter with a small cloud of darker colour at the base on each side, and in the same 
position with a curved fine stria, the surface sparingly and obsoletely punctate. Elytra 
elongate and narrow, without any trace at the base of a continuation of the thoracic 
stria, very finely and rather sparingly punctured and delicately pubescent, of a fuscous 
colour, marked, more particularly at the sides, with yellow; some distance behind the 
base is an indistinct yellow mark, which, with its fellow of the opposite side, forms an 
incomplete and irregular and indistinct transverse fascia; and at the apex a marginal 
mark extends a good deal inwards. Under surface and legs clear yellow ; the hind coxe 
somewhat sparingly and not coarsely punctate. The male has the three basal joints of 
the front and middle tarsi much dilated. 
This peculiar species will no doubt form a distinct genus. It has the prosternal 
process large and broad, and depressed along the middle. It is perhaps more allied to 
the Australian B. denticulatus than to any other known species; but it has no trace of 
any sutural stria on the wing-cases. 
18. Bidessus adumbratus. 
Hydroporus adumbratus, Clk. Ann. & Mag. Nat. Hist. ser. 3, x. p. 183°. 
Hab. Mexico (Truqui+); Guatemata, Paso Antonio, 400 feet (Champion). 
This is one of a group of small species found in the New World, and distinguished 
by a peculiarity of structure of the middle of the breast: the coxal lines are deeply 
impressed, and instead of ceasing at the anterior margin of the cox, commence there 
BIOL. CENTR.-AMER., Coleopt., Vol. I. Pt. 2, April 1882. LE 
