NORTH AMERICAN COLEOPTERA. I 41 



concorve, on each side of this an almost obsolete impressed line, surface densely 

 punctate. Elytra wider than the thorax, parallel, four discal costse, suture and 

 margin moderately elevated, intervals biseriately coarsely and closely punctate, 

 the two rows narrowly separated. Body beneath darker than above, closely 

 coarsely punctate. Length .12 inch; 3 mm. 



This species has no striking peculiarities. By its characters it is re- 

 lated to simplex Lee, but is larger, the punctures of the intervals smaller 

 without thickened anterior margin of thorax, and with well defined hind 

 angles of the thorax. 



One specimen collected by J. J. Rivers, near Berkeley, Cala. 



\j. servus n. sp. — Moderately elongate, brown, opaque. Head moderately 

 coarsely punctate. Thorax a little longer than wide, sides nearly straight, anterior 

 angles obtuse, the posterior distinct, disc broadly longitudinally concave at middle, 

 between this and the side margin an elevated line which joins both the apical and 

 basal margins, hooked at each end and entering for a short distance the apical and 

 basal ends of the median concavity, apical margin thickened, surface moderately 

 closely coarsely punctate. Elytra very little wider than the thorax, four discal 

 costse, suture and margin slightly elevated, intervals biseriately punctate, the 

 punctures distinctly separated, and the rows of punctures as widely separated as 

 the diameter of the punctures. Body beneath opaque, the prothorax coarsely 

 punctate, the abdomen granulate. Length .12 inch ; 3 mm. nearly. 



Related to the preceding species and simplex^ and diifers from both by 

 the presence of an elevated line between the median concavity of the 

 thorax and the side. The thoracic sculpture seems to be a more com- 

 plete development of that seen in referendarius. 



The species of Lasconotus now known to me are separable in the 

 following manner : 



Elytra equally costate over the whole surface. 



Thorax costate, or with feebly elevated sinuous lines. 

 Thorax wider than long. 



Disc of thorax costate. Eyes partially concealed complex Lee 



Disc with sinuous lines indicated by pubescence burealis Horn 



Thorax longer than wide, disc with sinuous lines linearis Crotch. 



Thorax vaguely longitudinally concave. 

 Thorax longer than wide. 



Disc without elevated line between the middle and side. 



Apical margin not thickened, hind angles sharply rectangular. 



ve^randis Horn. 



Apical margin thickened, hind angles obtuse simplex Lee. 



Disc with lateral elevated line servus Horn. 



Thorax as wide as long, no lateral elevated line, apical m#.rgin thickened. 



referendarius Zimm. 



Elytra broadly longitudinally concave, the fifth interval rather strongly elevated, 



the first and third not pusillus Lee. 



