160 NEW SPECIES MELYRIDAE, CHRYSOMELIDAE AND TENEBRIONIDAE 



darker about the abdominal apex; metafemora thickened and apparently 

 arcuate, sides at apical third moderately swollen. 



Female unknown. 



Measurements. Length, 3.2 mm.; width, 1.1 mm. 



Holotype, male, in my own collection ; paratypes in that of Mr. Chas. 

 Liebeck. 



Type locality. Fort Collins, Colorado. Only known from the type 

 locality. 



Remarkably distinct from interruptus and the unicolorous species of 

 the same region. It has not been possible to study the metatrochanters on 

 account of their being hidden by glue and the lack of specimens for 

 dissection. 



Listrus olympianus, new species. Form elongate suboval, slightly 

 robust and rather strongly convex. Color deep black with a slight bluish 

 metallic lustre ; head and pronotum feebly purpureo-aeneous ; tarsi and 

 tips of the tibiae somewhat rufo-piceous ; second antennal joint more or 

 less rufous, third joint rufo-piceous. 



Pubescence of less than moderate length, rather sparse, mouse- 

 colored and in certain lights flavo-plumbeous, dark areas difficult of 

 determination. Basal fascia broken into two maculae on each elytron, 

 the humeral small and the parascutellar larger ; post-basal represented by 

 an indefinite macula at middle of each elytron ; median fascia irregularly 

 and obscurely transverse ; subapical fascia transverse, entire or broken 

 and rather indefinite ; apical maculae more or less obscure. Maculations 

 are moderately wide as a rule. Pronotal median macula constricted at 

 middle, faintly incised anteriorly and posteriorly on the median line; 

 lateral semilunar vittae distinct or more or less atrophic. Pronotal 

 fimbriae not long nor close and cinereous in color. 



Head rather large and slightly wider than the pronotal apex ; front 

 broadly impressed between the eyes, a feeble median longitudinal con- 

 vexity is discernible; rather closely and distinctly punctate, intervals 

 obsoletely indentate, antennal convexities punctato-rugose ; muzzle short 

 with sides convergent. Antennae reaching to about the pronotal base, 

 not distinctly incrassate and dissimilar in the sexes, slightly compressed, 

 clothed rather thickly with short, stiff grayish hairs ; joints rather densely 

 punctate. 



Pronotum about a fourth wider than long, very slightly narrower 

 than the elytral base ; sides rather evenly and moderately arcuate in basal 

 half, less so anteriorly and slightly converging and rounding into the apex, 

 the latter arcuato-truncate at middle, serrules rather coarse ; basal angles 

 obtusely rounded; base arcuate; disk moderately strongly convex, less so 



