358 NITIDULIDA. 
1. Mecyllodes clavicornis, sp.n. (Tab. XI. fig. 18.) 
Rotundatus, convexus, nitidus, ferrugineus, antennarum clava nigra; elytris seriatim sat fortiter punctatis, 
interstitiis impunctatis. 
Long. 34 millim. 
Hab. GuateMa.a, Zapote (Champion); Nicaracua, Chontales (Janson). 
Antenne with large black club, the first joint of which is strongly transverse and 
but little longer than the second. Head rather closely and moderately coarsely punc- 
tured. Punctuation of the thorax near the sides similar to that of the head, on the 
middle more scanty and finer. Elytra with regular series of rather large punctures, the 
interstices almost impunctate. Under surface coarsely and very closely punctate, with 
a polished space in the middle of the metasternum ; prosternum carinate along the 
middle. Eight specimens. 
2. Mecyllodes nigropictus, sp. n. 
Rotundato-ovalis, convexus, nitidus, rufus, prothorace disco utrinque elytroque singulo nigro-plagiatis ; elytris 
interstitiis obsolete minus parce punctatis. 
Long. 37 millim. 
Hab. MExico, Cordova (Sailé), Cerro de Plumas (Hoge) ; GuaTeMaa, San Gerdénimo, 
Cahabon, Senahu (Champion). 
In this species the club of the antenne is rufescent; there is a rounded dark mark 
on each side of the thorax, and a large longitudinal black mark occupying the larger 
part of each wing-case; the punctuation of the middle of the breast is scanty, but not 
altogether absent, and that of the interstices of the elytra is distinct though very fine; 
the punctures in each series on the elytra are much more numerous than they are in 
M. clavicornis. 
MEONCERUS, gen. nov. 
Corpus minus convexum, subelongatum, glabrum. Clava antennarum magna, laxe articulata. Labrum 
integrum. Prosternum processu sat elongato, apice acuminato. Mesosternum obsolete carinatum. 
Metasternum in medio haud marginato, inter coxas intermedias subcontiguas reflexo-productum. Tarsi 
ineequales, anteriores dilatati, intermedii et posteriores subdilatati. 
This is apparently very distinct from any other genus; it perhaps comes nearer to 
Cychramus than to any cther, though as the upper surface is quite destitute of pubes- 
cence the two have a very different appearance. The labrum is rather large, and is 
not divided in the middle. The mandibles are short, concealed by the labrum when 
closed, and minutely denticulate before the apex. ‘The palpi are simple, the terminal 
joint of the labial pair being but little incrassate. The prosternum has a rather 
long process between the coxe, and the lower face of the process is placed at a right 
angle to the apex, which is applied to the vertical face formed by the meso- and meta- 
sterna between the middle coxe. These latter are but little separated, the meta- 
