162 NEW SPECIES MELYRIDAE, CHRYSOMELIDAE AND TENEBRIONIDAE 



Remarks. Olympianus is evidently rather closely related to dilutus, 

 from which it differs in the stouter and shorter antennae, flatter and 

 scarcely impressed front, and in the male the fifth ventral is modified. 

 In dilutus the same segment is squarely truncate and narrowly beveled on 

 the margin in middle third. The maculae in dilutus tend to transverse 

 fasciae, in both they are equally difficult of determination. In liebecki 

 the second antennal joint is elongate, in olympianus it is globular as long 

 as wide. 



Listrus occidens, new species. Form comparatively small, oblong- 

 oval, subparallel and moderately convex. Color black, with a distinct 

 aeneous lustre ; mouth parts more or less rufo-testaceous, palpi more or 

 less black ; antennae, tibiae and tarsi rufo-testaceous ; femora at times 

 slightly rufescent apically. 



Pubescence moderately short, abundant but not completely hiding the 

 body surface, recumbent, plumbeo-cinereous in color ; longer on the under 

 surface of the body, snowy white on the head, sterna and their side pieces ; 

 slightly darker on the abdomen but snowy on the apex. Dark brown 

 hairs of the upper surface reduced to a minimum, maculation of the elytra 

 nearly obsolete; a basal parascutellar dot and a very small post-basal 

 macula at middle of each elytron ; submedian and subapical fasciae repre- 

 sented by indefinite small maculae, apical dots obsolete. Pronotal maculae 

 indefinite, central figure apparently constricted at middle ; lateral vittae 

 broken into two dots each, the anterior of which appears as a rounded 

 macula in the antero-lateral quadrant of the disk. 



Head about as long as wide, eyes large and rather strongly convex ; 

 front broadly impressed, feebly convex on the vertex, punctures moder- 

 ately large, rather sparse, denser toward the epistoma, intervals feebly 

 rugulose and rather shining; white hairs on the muzzle and anterior 

 canthi of the eyes rather conspicuous. Antennae moderately long, 

 extending to about the pronotal base, three apical joints rather stout and 

 quite circular in transverse section, intermediate joints moderately com- 

 pressed; second joint oval, about as long as wide; third slender and 

 cylindrical, about as long as the second or the fourth, the latter sub- 

 triangular and rather prominent anteriorly; fifth slightly elongate, 

 apparently constricted at base and as wide as the ninth, anterior margin 

 prominent and arcuately rounded; sixth and seventh triangular, sub- 

 equal and as long as wide; eighth apparently wider than long and sub- 

 triangular; ninth subtriang.ular with sides somewhat arcuate; ninth and 

 tenth a little stouter, about as long as wide, sides arcuate ; eleventh short 

 ovate, less than a half longer than wide. 



Pronotum about a fourth wider than long, widest behind the middle ; 

 apex feebly arcuate in circular arc ; sides evenly and rather moderately 



