144 NORTH AMERICAN 



rate, twice as wide as long ; interocular surface two and three-fourths times 

 as wide as the eye, very moderately depressed ; longitudinal elevation very 

 slightly narrower than the lateral portions, evenly and rather strongly con- 

 vex ; punctures rather large, feeble, evenly distributed, close, confused, and 

 nearly obsolete ; interspaces granulose ; ocular lines meeting at one length 

 in advance ; antennae as long as the width of head, rather robust, piceous- 

 black, club distinct; joints three, four, five, and seven sub-equal, the last 

 slightly the thickest, sixth slightly shorter, eighth slightly elongated, as 

 wide as the seventh, club compact, last two joints distinctly broader than 

 the ninth ; maxillary palpi moderate, dark piceous-brown, first joint and 

 base of the second piceo-testaceous and rather pale. Prothorax widest just 

 before the middle, where it is six-sevenths as wide as the head, and one- 

 eighth narrower than long ; sides thence very slightly convergent posteriorly 

 and feebly sinuate ; anterior and posterior margins equal in length, the former 

 distinctly the more arcuate ; surface distinctly tuberculate near the basal 

 angles, broadly and rather feebly impressed on the flanks near the middle, 

 with two rather small distinct impressions near the apical angles, finely, 

 closely, rather evenly punctate ; interspaces roughly granulose ; canalicula- 

 tion beginning at one-third the length from the apex and extending to within 

 one-fourth the length of the base, narrowly impressed, nearly equally wide 

 throughout, not very strong, though distinct. Elytra at base wider than the 

 head ; sides parallel, distinctly longer than the width at base, rather strongly 

 arcuate, more so posteriorly ; together narrowly, strongly, and roundly emar- 

 ginate behind ; suture one-fourth longer than the pronotum; surface feebly 

 impressed on the suture at the base ; finely, somewhat feebly, closely, and 

 rather evenly punctate ; punctures impressed, seldom coalescent, no channels 

 present ; interspaces roughly granulose and shining. Abdominal segments 

 decreasing uniformly and rather rapidly in width, first much narrower than 

 the contiguous elytra, cylindrical ; border obsolete except on the first seg- 

 ment, where it is narrow and obscure; surface very closely, coarsely, and evenly 

 punctulate ; interspaces granulose and feebly shining ; punctures finer and 

 more distant toward the tip ; transverse carinae tricuspid, cusps closely ap- 

 proximate, sub-equal in length, finely acuminate, rather long and prominent. 

 Legs rather short and slender, blackish-fuscous ; first joint of the posterior 

 tarsi scarcely more than one-third longer than the second, and distinctly 

 shorter than the fifth, joints two and three nearly equal, fourth much shorter. 

 Under surface of the abdomen coarsely, closely, and evenly punctulate ; 

 interspaces rather polished, not visibly reticulated. 



Male. — Fifth ventral segment just visibly and evenly emarginate in the 

 middle, surface very narrowly, cylindrically, obscurely, and feebly impressed 

 throughout anteriorly ; sixth sinuate at tip, sinus rather more feeble in cur- 

 vature than the apices, and equal to them in width, evenly rounded, about 

 seven times as wide as deep ; seventh segment very narrow, truncate at tip, 

 truncation very feebly arcuate. 



Female. — Unknown. 



Length 2.8 mm. 



California, 1. 



This species is distinguished among its near neighbors by its very 

 narrow slender abdomen, by the more uniform character of the elytral 



