"2\V) AMERICAN COLEOPTERA. 



and third joints of the antennse subequal, as in most species of 

 Tacky*, while in the other two the second joint is distinctly longer 

 than the third. In Icevus (Plate VI, fig. 14) the antenna? are 

 almost moniliform, an approach to this form being seen in rufotesta- 

 ceous, while in trechiformis they arc of the form usually seen in the 

 genus. Were the species more numerous the group might easily be 

 divided into two on the structure of the antennae, but as they are so 

 lew I cannot see that any advantage would be gained by so doing. 

 All agree in having the dorsal punctures of the elytra on the third 

 interval very close to the third stria, in fact, being so close in tre- 

 c hi for mis as to appear rather like inward dilations of the stria itself. 

 An elytron of T. Iwvm is shown on Plate VI, fig. 6. 



The first two joints of the anterior tarsi are slightly dilated in 

 the males. 



The species may thus be separated : 



Small species; antenme with the second joint longer and stouter than the third ; 

 thorax narrower at base thax apex 2. 



Larger; antenme with joints 2-3 subequal ; elongate; rufo- testaceous; thorax as 

 wide at base as apex, hind angles rectangular; stria; of elytra obso- 

 letely punctulate. Length .11 inch I rcclii lor ill is n. sp. 



2. Pale rufo-testaceous ; elongate; thorax with the sides sinuate behind, hind 

 angles rectangular; stria? of elytra finely punctulate; marginal stria 

 with the apical portion distinct, the basal represented by setigerous 



punctures. Length .06-. 07 inch rufbtestaceii* n. sp. 



Piceous, often more or less tinged with rufous; less elongate; thorax with the 

 sides at most obsoletely sinuate behind, hind angles obtuse ; stria; of 

 elytra very fine, impunctate; marginal stria obsolete, represented by 

 setigerous' punctures. Length .05-. 06 inch lievtis Say. 



24. T. trechiformis n. sp. — Form slender, elongate, sub-depressed. Color 

 rufo-testaceous, shining. Head scarcely narrower than the thorax; frontal 

 grooves short, extending posteriorly scarcely to the middle of the eye: eyes 

 large and prominent; antenme less than one-half as long as the body, rufo-testa- 

 ceous, the second and third joints subequal ; palpi testaceous, the last joint very 

 small. Prothorax subquadrate, about one-half wider than long, as wide at base 

 as apex ; apex truncate; anterior transverse impression feeble, the posterior dis- 

 tinct, finely punctulate; median line fine, extending between the transverse im- 

 pressions; basal impressions moderately deep; base truncate; sides with the 

 margin very narrowly reflexed, arcuate in front, sinuate behind ; bind angles 

 rectangular, not carinate. Elytra elongate, oblong-elliptical, subparallel, slightly 

 wider than the thorax, finely striate ; stria; obsoletely punctulate, the three inner 

 deeper, the fourth and fifth feeble, all but the sutural abbreviated towards the 

 apex; marginal stria interrupted at middle, the basal and apical portions dis- 

 tinct ; first dorsal puncture about one-third from base, the second about one-third 

 from apex ; intervals fiat. Body beneath and legs pale rufotestaceous. Length 

 .11 inch ; 2.75 mm. 



