608 Coleopterological Notices, VI. 



reflexed at apex, the angles broadh' obtuse and rounded; antennal club well 

 developed and as long as the first four joints of the stem, the fourth palpal 

 joint twice as long as wide, o])liquely pointed, excavated as usual and just 

 one-half as long as the antennal clulj. Prothorax scai'cely more than one-half 

 wider than long, the apex not more than two-thirds as wide as the base, the 

 sides strongly convergent and only very feebly arcuate from base to apex, just 

 visibly more prominent a little before the middle; apex feebly emarginate; base 

 strongly and arcuately lobed in the middle, the basal angles rounded ; disk 

 rather finely, indistinctly and densely punctate. Elytra but slightly longer 

 than wide and nearly one-lialf mder than the prothorax, the sides parallel and 

 somewhat strongly arcuate ; disk feebly and not very densely punctate. Pygi- 

 dium three-fifths wider than long, moderately convex. Abdominal segments 

 connate, the fifth alone free as usual. Length 19.0 mm. ; width 10.5 mm. 



California (Los Angeles). Mr. Rivers. 



This species may be distinguished at once by the outline and 

 size of the prothorax, the sides being straighter and more con- 

 vergent from base to apex than in anj' other known to me. I 

 have before me only a single male, another perfectly similar speci- 

 men being at present in the cabinet of Mr. Rivers. 



T. riversin. sp. — Oblong-oval, convex, somewhat shining, pale brownish- 

 testaceous throughout, the knees minutely blackish; body clothed rather 

 sparsely with fine decumbent yellowish hairs, denser along the median line 

 and toward the sides of the pronotum; head, pronotum, sterna and femora 

 clothed in addition with long erect and consi^icuous j-ellowish pile. Head 

 much less than one-half as wide as the prothorax, the clypeus narrowed at 

 base, strong!}' concave, broadly arcuato-truncate at apex with the angles blunt 

 and rounded ; antenune well developed, the club almost as long as the stem ; 

 fourth palpal joint rather small, excavated, two-fifths as long as the antennal 

 club. Prothorax slightly less than twice as v\-ide as long, broadly subangulate 

 at the sides just behind tlie middle, the angle rounded, the disk at this point 

 much wider than at base; apex two-thirds as Avide as the base, broadly, cir- 

 cularly emarginate, the Imse arcuatel_y lobed in the middle, the angles obtuse 

 but very distinct and only slightly blunt; disk rather coarsely deeply closely 

 and distinctly' punctate. Elytra nearly one-fourth longer than Avide, fully 

 two-fifths wider than the prothorax; sides parallel, somewhat arcuate toward 

 apex, tlie latter very broadly arcuato-truncate; disk somewhat coarsely, 

 sparsely, unevenly and rather feelily punctate, the sculpture finer and denser 

 along the suture. Pygidium feebly transverse, moderatelj^ convex, rather 

 finely but subrugosely punctate, sparselj' puliescent, subglabrous near the apex. 

 Length 20.0-23.0 mm. ; width 10.0-12.0 mm. 



California (Los Angeles). 



The description given above is drawn from the male, and the 

 female, judging from a specimen before me, is larger, with the 

 vestiture rather dense, the antennal club being oval and but 



