34 * OTIOEHYXCHID.E. 



[Horn. 



E. sordidus Lee. (Ophryastes) Proc. Acad, vi, p. 445. 



Form oblong oval. Rostrum trisulcate, median sulcus attaining the base 

 of the rostrum, lateral sulci deep and straight, no transverse basal impres- 

 sion. Thorax slightly broader than long, sides moderately arcuate, base 

 and apex truncate, surface sparsely punctured and slightly uneven. Elytra 

 oval, striae replaced by rows of moderate punctures, intervals equal, sur- 

 face densely covered with cinereous scales and obsoletely maculate. Body 

 beneath and legs nearly white. Length .36 inch ; 9 mm. 



This species resembles the preceding bvit is less elongate, the elytra wider 

 at base, and the rostrum differently sculptured. Some specimens are macu- 

 late nearly as in Oph. tuberosus. The posterior cotyloid cavities are dis- 

 tinctly cavernous. 



Occurs in Kansas and New Mexico. 



E. argentatus Lee. (Ophrt/astes) Proc. Acad, vi, p. 444. 



Form oblong, surface covered with pearly white scales, vertex convex. 

 Rostrum with distinct basal impression, above trisulcate, median sulcus 

 fine and long, lateral sulci deeper, shorter and arcuate ; surface sparsely 

 punctured. Thorax broader than long, sides arcuate, base and apex trun- 

 cate, median line distinct, surface deeply perforato-punctate. Elytra oval, 

 slightly oblong, with broad shallow striae with large closely placed punc- 

 tures ; intervals slightly convex. Body beneath and legs silvery white. 

 Length .60 inch ; 15 mm. 



The cotyloid cavities of hind tibiae are scarcely at all cavernous. This 

 is the third species in size of the genus and may readily be known by the 

 characters given in the table. 



Occurs in the desert regions of south-eastern California. 



E. lucanus, n. sp. 



Form oblong, moderately robust. Head and rostrum as long as the 

 thorax. Rostrum with distinct transverse impression at base, and with 

 fine median line only, surface punctured covered with intermixed cinereous 

 and fuscous scales. Thorax nearly spherical, truncate at apex and base, 

 slightly wider than long, median line broad but shallow, surface coarsely 

 punctured covered with cinereous and fuscous scales with a broad, darker 

 line on each side. Elytra oval, slightly longer than twice the thorax, with 

 rather broad but very shallow stria? with coarse distant punctures, intervals 

 slightly convex, surface with dark cinereous scales irregularly marmorate 

 with fuscous. Bod}' beneath and legs covered with cinereous scales. 

 Length .28 inch ; 7 mm. 



The cotyloid cavities of the hind tibiaB are feebly cavernous and the 

 oval space at tip is very narrow and glabrous. 



One specimen from Cape San Lucas, Peninsula of California. 



E. desertus, n. sp. 



Form oblong, moderately robust, surface densely covered with silvery 

 white scales. Rostrum with rather deep transverse impression at base, 

 median sulcus shallow, indistinct, lateral sulci moderate, not deep, surface 



