MEGACRONUS. 319 
Antenne with the three basal joints obscure yellow; the penultimate joints quadrate, 
the tenth being nearly as long as broad. Head narrow. Thorax much broader than 
long. Elytra each with seven or eight regular series of very distinct punctures. Hind 
body slender, very acuminate behind, moderately closely punctate, with a very distinct 
fuscous pubescence. 
Also unique; the specimen is in decayed condition, and the natural colour of the 
elytra and hind body may be more rufescent in good examples. 
4, Megacronus meridionalis. (Tab. VII. fig. 19.) 
Gracilis, rufescens ; antennis, elytris abdomineque fuscis, illis ad humeros plus minusve rufo-maculatis, anten- 
narum basi palpisque testaceis; antennis crassiusculis, articulis penultimis leviter transversis; elytris 
regulariter seriatim fortiter punctatis. 
Long. 5 millim. 
Hab. Guatemata, Zapote, Panima in Vera Paz (Champion); Panama, Volcan de 
Chiriqui 2000 to 4000 feet (Champion). 
Antenne rather short and stout; joints 5-10 differing but slightly from one another ; 
the three basal joints yellow. Head and thorax red, the latter not so long as broad, 
the hind angles rectangular. Elytra a good deal longer than the thorax, each with 
seven or eight series of punctures. Hind body with each segment fuscescent at the 
base, reddish behind, the segments only finely punctate, but conspicuously pubescent. 
In all six specimens are before me, showing variation in the details of the colour and 
of the stoutness of the antenne; in certain of the males the sixth ventral segment is 
provided with an elongate longitudinal carina most elevated behind, while in another 
there is no carina but only a tubercle behind. As the differences are but slight, and no 
two individuals quite agree, I must consider all to be one variable species, the type being 
a specimen of bright colour, with stout antenne and only tuberculate penultimate ventral 
segment, from the Volcan de Chiriqui. 
The figure represents a variety found at Zapote. 
5. Megacronus regularis. 
Nigricans ; antennarum basi, palpis pedibusque flavis; elytris rufescentibus, ad latera et ad suturam nigri- 
cantibus; abdominis segmentorum marginibus posterioribus ferrugineis; antennis brevibus, apicem versus 
incrassatis, articulis penultimis transversis; elytris regulariter seriatim punctatis; abdomine subtiliter 
punctato. 
Long. 4 millim. 
Hab. Guatemata, Zapote, Capetillo (Champion). 
This insect is much smaller than J. meridionalis, and the third, fourth, and fifth 
joints of the antenne are markedly smaller; the elytra are a good deal less elongate, 
and the seven series of punctures on each are remarkably regular and distinct. 
There is only one example from each locality. 
