— Ill — 

 THREE NEW SPECIES OF COLEOPTERA. 



RV J. J. RIVERS. 



Amblychila baroni n. sp.— Form graceful; above wholly of a sul)dued 

 resinous black; beneath shining black. Head subquadrale, with two punc- 

 tures distant from each other and situated just behind the first or clypeal 

 suture; two other punctures are behind the the second or frontal suture, but 

 these punctures are firmer and closer together and nearly central; on the 

 vertex near the eye is a triangle of three punctures. Thorax strongly convex, 

 slightly longer than wide when looked at from above, but exact measurement 

 of the anterior margin, through its great convexity, shows it to be greater 

 than its longitudinal measurement; the side margins narrow from the front 

 to the hind angles, in a gentle curve where they end in a transverse constric- 

 tion that involves the hind margin, though it is raised above the constriction; 

 the pronotum is produced in the middle on the front margin, and it is ex- 

 tended in the middle of the hind margin; hind angle subacute; a fine longi- 

 tudinal impressed line, which does not reach either the front or hind margins. 

 Elytra twice as long as wide, convex; flattened upon the central area; a series 

 of well formed imbricated punctures and representing about sixteen broken 

 rows; at the base a few of these imbrications become connected lorming a 

 short ridge or keel, while some others have developed into a mucron over- 

 hanging a puncture, or else forming a slight elevation between punctures; the 

 whole becoming less asperate towards the apex. The acute margin extends 

 from the basal angle about two-thirds and becomes obsolete; it is formed of 

 a narrow carina slightly interrupted, and it is accompanied on its upper side 

 by a row of fine punctures the acute and real margins are nearly parallel, 

 and the interval between them is ornamented by four rows, much broken, of 

 mucronate punctures like those on the elytra. Length i.oo inch; 25 mm. 



One specimen 9 , found by Mr. Oscar F. Baron, in Pantano 

 County, Arizona, after whom I have great pleasure in naming this 

 insect. 



The above insect is certainly not easily confounded with any 

 other North American species; Picolomini's example is conceded to 

 be a varietal form of Say's A. cylindriformis, and the great size and 

 profuse ornamentation in A. cylindriformis will alone be sufficient 

 to separate it from A. baroni. 



Cychrus (Brennus) oreophilus n. sp.— Form broad, flattish convex, with 

 beautiful outline, prothorax dull black, elytra moderately shining black, be- 

 neath shining black. Head proportionate, front nearly smooth, with a well 

 marked depression inside orbital ridge; genai doubly notched. Thorax wider 

 than long, widest across the foremost third, then decreasing sharply and ob- 

 liquely to the hind margin, which is much contracted between the angles; in 

 the oblique side margin there is, in some examples, the faintest indication of 

 a sinuation; hind margin truncate, angles acute: at the base is a transverse 

 impression, out of which grows a central depressed line reaching near to the 

 front margin. Elytra with thirteen equally formed striae, coarsely punctate 



