130 AMERICAN COLEOPTERA. 



deep, abbreviated behind; transverse impressions distinct; basal impressions 

 moderately broad, obsoletely bistriate ; sides with the margin narrowly reflexed, 

 arcuate in front, sinuate behind ; hind angles rectangular, carinate. Elytra 

 slightly wider than the thorax, oblong-ovate, deeply striate ; strise entire, im- 

 punctate, the fifth slightly grooved at tip; third stria with the first dorsal punc- 

 ture about one-third from base, the second about one-third from apex, the punc- 

 tures veiy small : intervals convex. Body beneath and legs rufous. Length 

 .16-.17 inch ; 4-4.25 mm. 



Distinct from latieeps by the characters given above. 



In the four specimens known to me the third and fourth striae 

 unite at the position of the first dorsal puncture, but are distinct 

 from thence to apex. Of these one is in Dr. Horn's collection, two 

 in the LeConte collection at Cambridge, and the other in my own 

 cabinet. 



It occurs in Massachusetts. 



122. B. latieeps Lee. — Form elongate, depressed; color dark rufous. Head 

 large, as wide as the thorax; palpi rufo-piceous; antennae scarcely one-half the 

 length of the body, rufo-piceous. Prothorax trapezoidal, slightly wider than 

 long, distinctly narrower at base than apex ; apex feebly emarginate ; median 

 line fine, abbreviated before and behind ; transverse impressions moderately dis- 

 tinct: basal impressions very shallow, unistriate ; sides with the margin narrowly 

 reflexed. arcuate, slightly sinuate in front of the hind angles, which are rectan 

 gular. not carinate. Elytra nearly elliptical, scarcely wider than the thorax, 

 finely striate, the outer strise indistinct; strife impunctate, the first, second and 

 fifth entire, the latter grooved at tip, the others m6re or less eSaced at apex ; 

 third stria with the first dorsal puncture about one-third from base, the second 

 about one-third from apex ; intervals feebly convex. Body beneath and legs 

 dark rufous. Length .14-.16 inch ; 3.5-4 mm. 



A very curious and well-marked species. 



I have seen but two specimens, Dr. LeConte's type from San Diego, 

 Cal., and one specimen, also from California, in Dr. Horn's cabinet. 



Group xxi. oblong-ulum. 



Mandibles long, slender, nearly straight, feebly arcuate at tip. 

 Maxillse with the outer lobe with the two joints united ; frontal 

 grooves single, straight, parallel ; eyes small, flattened. Elytra with 

 the humeri rounded ; third interval with two dorsal punctures. 



This group is the equivalent of Amerizus Chaud., which, as pre- 

 viously stated, was erected for the reception of spedabile, being based 

 upon the peculiar structure of the outer lobe of the maxillse. This 

 character is also possessed by oblongahmi, a species referred by Chau- 

 doir to Lymnceum. Both bear considerable resemblance to Treehus, 

 in which genus they were originally placed by Mannerheim They 

 may be distinguished by the following characters: 



