142 



I-'ronodiin moderutc-, with the anterior margiu entire and rounded, basal margin 

 sinuatid witli tlie an<;les produced and very acute. 



Scutelltim elongate, with the extremity rounded. 



Elytra entile. 



U'inps not e.xamined. 



.Ibdomen not examined. 



Prothoia.v (PI. IV., B fig. '2, a) moderate, with the prostcriium rather large, narrowly 

 elevated between the coxfe, and acuminate posteriorly ; epistcrna small, tri- 

 angular ; cpiiiiira large, broadly enclosing the co.xal cavities ; coxal Cavities 

 moderate, suiiovate. 



Pectus with the mesosieriium (PI. IV., B, fig. "2, d) rather short, much e.xcavated in 

 front ; epistenia moderate, sub-oblong ; tpimera large, humeral, extending to 

 the coxal cavities ; coxal cavities rounded and moderately distant. 

 metdstcnium (PI. IV., li, lig. '2, g) moderate, transverse, not extending to the sides 

 of the body, with the basal margin between the coxa; nearly straight ; epistentu 

 very large and l>road, longer than the metasternum ; epimem narrow, entirely 

 covered by the epipleural folds of the elytra. 



I'enter composed of five segment.s; 1 large, nearly as long as the metasternum; 2-4 

 short, equal to each other in length ; 5 much longer than the fourth, simple. 



Legs antcrioy with the trochanters very large, oblong, much produced and truncate 

 at the extremity ; femora long and robust, not incrassated, broadly margined 

 on each side ; tibiie shorter than the femora, robust, serrate on the outer edge, 

 and much dilated towards the apex ; tarsi four-jointed, with the two basal 

 joints large and deeply bilolied ; the third minute ; the fourth long and slender, 

 with the claws robust, and dentate beneath at the base. 

 intermediate much longer than the anterior, with the tibiaj sinuated. 

 posterior with the tibiic ciliated, and armed with short spurs at the apex, in other 

 respects like the intermediate. 



(.'ox<e anterior subovate, not contingent or prominent. 

 intermediate rounded, moderately distant. 

 2Jogterior elongate-pyriform, rather remote, almost reaching to the episterna. 



From Con/lophus, Micrdum is distinguished by its ten-jointed antennaj, and by 

 the epimera of the mesosternum extending to the coxal cavities ; and from 

 Cori/lophodes by the same characters, with the addition of its elongate posterior 

 angles of the thorax. 



The genus is at present represented by a single specimen only, found \)\ Mr. 

 Champion in Central America. 



Microum ovoforme. 



M. ovoforme, Matthews, Biol. Cent.-Amer. Col. ii. pt. i. p. 110, 1888. 



L. c. }J lin. = 1'37 mm. — Ovatum, latum, valdissime couvexum, nitidissimum, 

 pilis exiguis sparse indutum ; pronotn modico, antice fere circulariter rotundato, 

 raargino anterior! marginata, baud refiexa, distincte sed levissime alutaceo, niti- 

 dissimo, margine basali scutollum versus productu, angulis acutis, sat longe 

 productis ; eh/tris sat longis, pronoto vix latioribus, plus quam duplo lougioribus, 

 ad media latissimis, punctis umbilicatis eleganter et regulariter irapressis, inter- 

 stitiis alutaceis, lateribus leviter marginatis, apice parum attenuato ; pedibus 

 robustis, rufo-piceis, articulo basali tarsorum dilatato ; antennis modicis, rufo- 

 castaneus. 



Body ovate, broad, exceedingly convex, very shining, sparingly furnished with 

 minute hairs, rufo-castaneous. 



