128 AMERICAN COLEOPTERA. 



angular or snbaciite. carinate. Elytra about one-half wider than the thorax, 

 oblong-ovate, finely striate ; strife entirely obliterated behind, with deep, not 

 closely placed punctures; intervals flat. Beneath black, shining. Legs yellowish 

 testaceous. Length .15-. 17 inch ; 3.75-4.25 mm. 



A very well-marked species. It recalls Icevigcdum by the arrange- 

 ment of the dorsal punctures. The setse arising from them are very 

 distinct in well preserved specimens. 



It occurs in the eastern portions of the country, being known to 

 me from New Hampshire, Massachusetts, Pennsylvania and Ken- 

 tucky. In the LeConte collection there is one specimen labeled 

 " Southern States." 



Group xix. iridescens. 



Maxillae with the outer lobe biarticulate ; frontal grooves single, 

 straight, parallel ; eyes large, prominent. Thorax trapezoidal. Ely- 

 tra with the humeri rounded, the humeral line hamate, uniting with 

 the fifth stria, which is entire ; dorsal punctures two, placed on the 

 third interval near the third stria. 



But two species are included in this group. They bear some re- 

 semblance to Trechus, and may thus be separated : 



Elongate, depressed ; piceous or nearly black, slightly iridescent ; thorax slightly 

 wider than long, scarcely narrower at base than apex ; elytra finely striate. 

 Length .21-.22 inch trechifoi'ine Lee. 



Broader; bluish black, iridescent, the elytra more or less rufescent at tip. rather 

 more deeply striate ; thorax about one-half wider than long, as wide at 

 base as apex. Length .15-. 18 inch iri(lescen»$ Lee. 



119. B. trechiforme Lee. — Form slightly elongate, depressed ; color nearly 

 black or piceous, more or less iridescent, shining. Head scarcely narrower than 

 the thorax at apex : palpi rufo-testaccous, darker at tip : antennae more than one- 

 half as long as the body, fuscous, the basal joints yellowish testaceous. Prothorax 

 trapezoidal, slightly wider than long, scarcely narrower at base than apex, sparsely 

 punctate at base : apex slightly emarginate ; median line fine, subentire ; trans- 

 verse impressions nearly obsolete ; basal impressions broad, deep, bistriate ; sides 

 with the margin distinctly reflexed, arcuate to behind the middle, slightly sinuate 

 in front of the hind angles, which are rectangular, carinate. Elytra distinctly 

 wider than the thorax, oblong-oval, finely striate, more finely at sides and tip ; 

 striae impunctate or obsoletely punctulate, the five inner entire, the fifth slightly 

 grooved at tip; intervals flat, the third with the first dorsal puncture about one- 

 third from base, the second about one-third from apex. Beneath nearly black, 

 shining, the abdomen sometimes tinged with rufoas. Legs yellowish testaceous. 

 Length .21 .22 inch ; 5.25-5.5 mm. 



Larger and more elongate than iridescens, with the thorax nar- 

 rower as compared with its length, scarcely narrowei' at base than 

 apex, and the elytra unicolorous. 



It is known to me from California and Washington (Spokane 

 ■Falls). 



