AMERICAN COLEOPTERA. 89 



front, feebly narrowed to base which has a narrow black margin'; surface very 

 coarsely but sparsely punctured, feebly convex, with a median shallow impres- 

 sion and two oblique very vague impressions near the hind angles. Elytra 

 twice as wide as thorax at base, sub-parallel, metallic blue, sparsely clothed 

 ■with short fine pale hairs, densely punctured and scabrous. Body beneath 

 (except thorax; and legs metallic blue, shining, very sparsely punctured and 

 clothed with pale hairs more densely placed on the pectus and legs. Length 

 .45 inch : 11.5 mm. 



Differs from all our Diti/lns by its color and recalls Asdera excavata, 

 Lee. Resembles Xacerdes in from rather than our larger Ditylus, 

 but cannot be separated generically from the latter. 



One specimen from Fort Klamath, Oregon. jMr. Wm. ^l. Gabb. 



D. cyanipennis, n. sp. — Color bluish black, shining; elytra metallic blue. 

 Head metallic blue, shining, coarsely not densely punctured. Thorax black, 

 faintly bluish, rather coarsely and densely punctured, not longer than broad, 

 sides feebly rounded in front, gradually narrower to base, disc with an indistinct 

 impression on the median line on front, and a vague V-shaped impression with 

 the apex toward the basal margin. Elytra scarcely as broad as twice the 

 width of thoracic base, parallel, bright bluish with slight violet tinge, densely 

 punctured and scabrous. Body beneath metallic blue, shining, sparsely punc- 

 tured and with few pale hairs. Legs bluish-black. Length .30 inch; 7.5 

 mm. 



This is our smallest Difi/lns and resembles Oxacis still more than 

 the preceding species, and may easily be distinguished from all others 

 of the genus by sculpture and color, none of our other species except 

 the preceding having any brilliancy, being for the most part blackish 

 and opaque or with very faint metallic tinge. 



Coast Range of California, south of San Francisco, Mr. Wm. M. 

 Gabb. 



Oxacis sericea, n. sp. — Brown or brownish testaceous, shining, rather densely 

 clolliod with greyish silken pubescence. Surface finely and densely punctured. 

 TJiorax longer than broad, sligiitly flattened, at the disc, sides strongly rounded 

 in front, gradually narrower to base ; paler than the elytra with median stripe 

 and sides dusky. Elytra rather robust, densely pubescent; color brown or 

 slightly paler with an oblique pale stripe extending from the humerus toward 

 apex. Body beneath black, tip of abdomen pale, densely but very finely punc- 

 tured. Length .28 'J, —.38 9 inch; 7 — 9.5 mm. ' 



In this species the last joint of the maxillary palpi may be said to 

 be elongate oval, broader nearer the base, apex rounded. Resembles 

 in color /alir/mosa but may be distinguished from all our species by 

 the much more dense pubescence with hairs longer and less fine. The 

 pubescence is so dense and closely recumbent as to hide almost entirely 

 the color of the elytra. As in other species this varies somewhat in 

 its coloration, the thm'ax being at times paler than the head or elytra, 

 or the entire upper surface may be uniformly brownish. The lateral 



