384 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 45. 



MELAMOMPHUS NIGER Horn. 



A single specimen is at hand answering perfectly to the descrip- 

 tion. It was collected at Carson City, Nevada, July 30, by Professor 

 Wickham. 



MELAMOMPHUS ELONGATUS Horn. 

 Amnesia elongata Horn. 



This species is absolutely congeneric with niger and is of exactly 

 the same facies. The single specimen at hand is labeled from Cali- 

 fornia. 



MELAMOMPHUS SORDIDUS Horn. 

 Amnesia sordida Horn. 



This sjjecies has a slightly ditrerent facies, but has no characters of 

 generic value separating it from the preceding group. 



MELAMOMPHUS DECIDUUS Horn. 



Amnesia decidua Horn. 



One specimen labeled California and one from Alameda County, 

 California, have been assigned here. The nasal plate is concave, 

 crescent shaped, and poorly defined. 



MELAMOMPHUS NIGRESCENS, new species. 



Described from three specimens from Riparia, Washington, March 

 22, 1911 (Wash. Exp. Sta. No. 3), transmitted by Mr. M. A. Yothers. 



Length 6.5 mm.; width 2 mm. 



Body black, covered with silvery striate scales, and with long, fine 

 black and white pilosity; appendages reddish. 



Head and beak roughly punctate and tuberculate; beak longer 

 than head and separated from it by a broad transverse depression; 

 beak dilated at alse; scaly vestiture quite close, pubescence sparse. 

 Nasal plate semielliptical, but basally emarginate, depressed, gla- 

 brous, more than usually well defined. Genae truncate. Supports of 

 deciduous pieces of mandibles verypromment. Scrobes subterminal, 

 deep and well defined at apex, but broadening and becoming obsolete 

 at a short distance from the eyes. Scape reaching a little beyond the 

 middle of the eyes ; f unicle with first joint longer than second, remain- 

 ing joints becoming shorter than broad; club oval. Prothorax about 

 as long as wide, basally and apically truncate, laterally convex, ocular 

 lobes small, fimbriate; disk granulato-tuberculate ; vestiture dense. 

 Elytra narrow; humeral angles small but wider than prothorax at 

 base; intervals broad, flat, densely squamose, sparsely pilose; strial 

 punctures long, shinmg, approximate, shallow, setigerous. Under- 

 sides shallowly, confusedly punctate, sparsely squamose and pilose; 

 first ventral suture straight, second segment not longer than the two 

 following segments; tibiae mucronate, the anterior denticulate, the 

 posterior with an apical disk inclosed by spines. 



Type.— Ceit. No. 14635, U.S.Nat.Mus. 



