AMERICAN COLEOPTERA. 259 



sculpture of the thorax does not however differ. The elytral inter- 

 vals are alternately more convex, and the entire surface is covered 

 with short black pubescence as in niger. The striai are replaced by 

 larp;e vague punctures at middle, and at the sides are broken into 

 short lines, basal margin arcuate at humeri. Prosternum very sparsely 

 punctured, episterna smooth. Metasternal episterna long, sparsely 

 punctured and margined. Abdomen as in jjurpuricollis. Length 

 .50 inch ; 12.5 mm. 



Anterior femora of male simple. Labrum truncate. 



One specimen S from Saskatchewan region, others are in the cabinet 

 of the British Museum. 



5. C. Iliger, Randall. — Black rarely with a faint bronze tinge. Head 

 smooth, a faint vertical puncture. Labrum emargiaate. Antennae black. Palpi 

 slender. Thorax broader than long, apex narrower, sides regularly arcuate; 

 margin with a thickened edge, base slightly narrowed, hind angles obtuse, 

 surface with coarse punctures at the sides and base, along the median line, 

 and in continuation of the basal impressions, intervening spaces smooth and 

 moderately convex. Elytra striate, striae finely punctured, intervals moderately 

 convex, moderately densely punctured, sparsely clothed with short brownish 

 pubescence with yellowish hairs very sparsely intermixed. Prothorax beneath 

 sparsely punctured. Metasternal episterna sparsely punctured, margined. Ab- 

 domen sparsely punctured and pubescent. Length .50 inch; 12.5 mm. 



Anterior femora of male simple. 



Occurs from Canada to Louisiana and Florida. 



6. €. interriiptns, n. sp— Body black above and beneath. Head as in 

 nigcr, labrum subtruncate, antennae black. Thorax nearly twice as wide as 

 long, very little broader at base than apex, sides moderately arcuate, margin 

 slightly thickened, disc moderately convex, basal impressions shallower than 

 in niger, median line moderately imjjressed, surface punctured as in niger. 

 Elytra relatively broader than in niger, striae broken into lines of varying 

 length, intervals punctured as in niger but with shorter less conspicuous pubes- 

 cence. Body beneath entirely as in niger. Length .46 inch; 11.5 mm. 



The upper surface is rather less shining than in niger and the form 

 rather more robust, the labrum much less emarginate, and the thorax 

 narrower at base and the sides much less depressed. The short lines 

 into which the strias are broken, are deeply impressed and the inter- 

 vals between the rows convex. 



I was at one time disposed to consider this as a deformed niger, but 

 Mr. Ulke assures me that four specimens exactly alike have been 

 taken, two of them in copulation. 



Occurs in Washington County, Oregon. For the unique in my 

 cabinet, I am indebted to Mr. H. Ulke, who kindly divided his pair 

 with me. 



