DESCRIPTION OF NEW SPECIES 157 



Female. Fifth ventral abdominal segment rounded at apex, tip 

 deflexed, surface with a small but distinct impression in front of the 

 deflexed margin. 



Measurements. Length, 2.4 mm. ; width, .9 mm. 



Holotype, female, in my own collection. 



Type locality. Mokelumne Hill, Calaveras County. Collected in 

 May. A single specimen studied. A very distinct species in the charac- 

 ters of the head, pronotum and elytral maculation. 



Listrus trochantcricus, new species. Form slightly robust, oblong- 

 ovate, rather more than twice as long as wide. Color black; tibiae and 

 tarsi rufo-testaceous, tibiae at base and tarsi toward tip, blackish ; second 

 joint of the antennae rufo-testaceous, first joint black as usual, remaining 

 joints rufo-piceous, last two or three may be quite black. 



Pubescence rather dense and coarse, almost concealing the general 

 surface, cinereous in color, with brownish-black maculae and fasciae 

 arranged on each elytron as follows: A rounded parascutellar macula 

 and a humeral lunule more or less interrupted behind the umbo, 

 umbonal dot small or absent, apical portion feebly arcuate, appearing as a 

 post-basal macula ; a narrow transverse fascia a little behind the middle, 

 slightly zig-zag, and interrupted at the suture, often broken into two 

 maculae on each elytron ; subapical transverse fascia similar in form ; 

 apical macula present or absent. Pronotal pattern consists of lateral 

 semilunar vittae and a somewhat constricted central figure, the former 

 broken into two and the latter more or less dissolved into four parts. 

 Central area of the head submaculate. Maculae of the head and pronotum 

 not very distinct. 



Head slightly transverse, front rather broadly impressed, or longi- 

 tudinally impressed within the eyes, with a feeble central longitudinal con- 

 vexity, punctures not coarse, rather crowded in the impressions, some- 

 what sparse elsewhere, intervals scarcely indented, a small impunctate area 

 at base of the epistoma ; muzzle short, margin evenly arcuate from side to 

 side. Antennae rather slender, feebly incrassate, outer joints noticeably 

 heavier, slightly compressed ; third cylindrical, fourth obconico-triangular, 

 both slightly elongate ; fifth serrate, a little wider than the sixth, sixth to 

 the tenth inclusive, subtriangular. 



Pronotum less than a fourth wider than long ; sides evenly and rather 

 strongly arcuate, moderately convergent anteriorly and less arcuate, 

 serrules not strong ; basal angles not evident and well rounded ; base 

 broadly arcuate ; disk evenly convex, more strongly so anteriorly, closely 

 punctate, punctures moderate in size, separated by a distance more or less 

 equal to their diameter, intervals scarcely indented in the central area, but 



