378 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 45. 



<?'. Vestiture squamose intermixed with decumbent bristles; support of 

 deciduous piece of mandible not prominent; alternate elytral inter- 

 vals slightly more convex; ventral scales squamose; nasal plate ill- 

 defined Amotus Casey. 



(P. Vestiture squamose intermixed with fine erect hairs; support of decidu- 

 ous piece of mandible prominent; nasal plate sharply defined by a 

 distinct rim. 

 e^. Apex of hind tibiae with a double row of setae forming an apical disk; 



humeri entirely obliterated Diamimus Horn. 



e'. Apex of hind tibiae with a single row of setise at apex; humeri rec- 

 tangular Peritaxia Horn. 



a^. Scrobes not passing beneath at a distance from the eyes; vestiture squamose 

 and intermixed with bristles. 

 fK Scrobes moderately arcuate, passing immediately beneath the eyes; nasal 



plate sharply defined by a distinct rim Anametis Horn. 



/-. Scrobes narrow, deep and well defined throughout, obliquely descending 

 to lower angle of eye, beak not depressed at base; nasal plate short, broadly 



angulate, distinctly rimmed Melhonus Casey. 



2. Scrobes evanescent posteriorly, badly defined, nearly straight or flexed gradually 

 downward, directed toward lower angle of eye. 

 a^. Metastemal side pieces rather wide, suture distinct. 



h ^ First ventral suture generally straight or only slightly arcuate in the middle; 

 second ventral segment not longer than the next two combined, 

 c^ Scaly vestiture mixed with fine, long pubescence. Nasal plate poorly 



defined Melamomphus Horn. 



c^. Scaly vestiture mixed with stout setae or bristles; nasal plate triangular 

 or crescentiform, generally poorly defined, slightly emarginate 



Dyslobus LeConte. 



fe2. First ventral suture broadly arcuate; second ventral segment usually much 



longer than the next two combined; nasal plate very deeply emarginate, 



strongly defined Adaleres Casey. 



a?. Metastemal side pieces indistinct, suture obliterated; strial punctures squa- 

 migerous; beak stout, broad, separated from head by a distinct impression, 

 eyes strictly lateral Panscopus Schonherr. 



Several distinct facies occur in this tribe, but it is impossible to 

 find characters to draw those together of like facies. There is a 

 striking similarity of appearance between Orimodema protracta, Mel- 

 honus denticulatus, and DysJohus segnis, lecontei, and verrucifer. 

 Diamimus, Peritaxia, Ildamomphus and TTiricomigus form another 

 group of similar facies. A third distinct group is formed of those 

 species mth the alternate intervals elevated in Dyslobus {Amnesia), 

 Adaleres, and Panscopus. 



Genus CIMBOCERA Horn (1876). 

 Cimbocera Horn, Proc. Amer. Philos. Soc, vol. 15, 1876, p. 55. 



The genus is monotjpic, based on pauper Horn. 



It appears to have as its principal character the narrow third tarsal 

 joint. The seventh funicular joint in some cases may not be contigu- 

 ous to the club but is usually much broader than the preceding joints 

 and differently clad. 



