114 CORYLOPHIDZ. 
hooked, armed with three long and very sharp teeth. Mandzbles small, armed with four robust and very 
sharp teeth. Prosternum very short, elevated between the cox, and broadly dilated posteriorly ; epimera 
very narrow, enclosing the coxal cavities. Mesosternum short; episterna large ; epimera not extending to 
the coxal cavities. Metasternum moderate, transverse, not extending to the sides of the body ; episterna long 
and broad; epimera concealed. Venter composed of six segments, the first very long. Legs pubescent: 
anterior with the trochanters small, triangular; femora robust; tibia simple, dilated anteriorly; tarsi 
rather long and robust, 4-jointed—1 long and simple, 2 and 3 very small, simple, 4 long; claws moderate, 
convergent, with an obtuse denticulation below near the base; intermediate similar to the anterior, but 
rather longer ; posterior similar to the preceding, but longer and more robust, with the inner angle of the 
trochanters elongate and acute, and the outer edge of the tibiz minutely denticulate near the apex. 
It is difficult to distinguish this genus from Sacium: the shorter and broader form of 
many of its species generally affords the best clue to their separation. The short 
10-jointed antennz form the only conspicuous anatomical difference ; the shape of the 
labrum and of the labial palpi is also very diverse, but it is almost impossible to make 
any use of organs of such infinitesimal proportions. 
In my descriptions of these older genera I have given their anatomical details at 
greater length than may be considered absolutely necessary, but they appear to me to 
have hitherto been imperfectly noticed. 
Several species of this genus have been described from Europe, Madeira, Peru, &c. 
The most obvious characters of the five Central-American species are as follows:— 
Elytra variegated dimidiatus. 
Elytra not variegated. 
Thorax rufescent . . misellus. 
Thorax and elytra concolorous. 
Legs testaceous. .-. 2... ww Ova. 
Legs piceous, 
Pubescence golden . . . . . 1... miger. 
Pubescence black . . . . . . 1...) hirsutus. 
1. Arthrolips dimidiatus, sp. n. 
Oblongus, modice convexus, nitidus, subtiliter punctatus, pilis aureis vestitus, pronoto rufo, elytris antice 
obscure castaneis, postice late rufis ; pronoto magno, antice circulariter rotundato et modice reflexo, leviter 
punctato, interstitiis glabris, nitidis, linea basali leviter impressa, margine basali sinuata angulis acutis ; 
elytris quam pronotum vix latioribus, plus quam sesqui-longioribus, prope humeros latissimis, leviter et 
remote punctatis, interstitiis glabris, nitidis, dimidio basali obscure castaneo, posteriore lete rufo, lateribus 
marginatis, apicibus latis, leviter rotundatis ; pedibus robustis, sat brevibus, late flavis; antennis flavis, 
clavis obscurioribus. Long. corp. 1:12-1:25 millim. 
Body oblong, moderately convex, shining, rather finely punctured, clothed with golden hair, the thorax red, the 
elytra with their basal half dark castaneous and their apical half bright red, sometimes dusky near the 
middle of the apical half. Head large, yellow ; eyes large, very prominent; antenne yellow, with the club 
dusky. Thorax large, circularly rounded and moderately reflexed in front, lightly punctured, with the 
interstices smooth and shining; basal line faint; basal margin sinuated, with the angles acute. Scutellum 
large, rounded. lytra scarcely broader but more than one half longer than the thorax, widest near the 
shoulders ; lightly and remotely punctured, with the interstices smooth and shining; the basal half dark 
castaneous, the apical half light red, sometimes with an indistinct dusky mark across the middle of 
