22 PROCEEDINGS OF THE NATIONAI, MUSEUM vol. loi 



Type. — A female in the LeConte collection, Museum of Compara- 

 tive Zoology. 



Type locality. — "Platte Kiver [Kansas] under dried buffalo excre- 

 ment." 



Other localities. — Alberta: Chappice Lake, Medicine Hat; Sas- 

 katchewan : Roche Percee ; Montana : Big Horn County ; Wyoming ; 

 North Dakota: Medora; South Dakota: Avance, Belle Fourche, 

 Browns Valley, Canning, Canton, Cedar Canyon, Chamberlain, 

 Cheyenne Agency, Fort Thompson, Fox Ridge, Gettysburg, High- 

 more, Houghton, Kimball, Lantry, Martin, Newell, Oelrichs, Philip, 

 Rapid City, Spearfish, White Lake; Nebraska: Columbus, Crete, 

 Lincoln, McCook, West Point; Iowa: Council Bluffs, Sioux City; 

 Colorado: Colorado Springs, Fort Collins, Greeley, Las Animas, 

 Pueblo; Utah: Salt Lake; New Mexico: Coolidge; Kansas: Clark 

 County, Gove County, Meade County ; Texas : Dallas. 



Remarks. — Of 231 specimens collected in June and July 1947 in 

 South Dakota by H. C. Severin, only 9 were males. No male specimen 

 had previously been found in all the collections examined. In his 

 treatment of the Eumolpini in 1892, Horn mentioned that he had 

 seen only females. The species has the broadest scales of any species 

 of the genus in the United States. There is considerable variation in 

 the color pattern formed by the scales, some beetles having the elytra 

 entirely white, but the elytra are more commonly brown with a lateral 

 white stripe and remnants of a median one, frequently abbreviated to 

 spots or an apical vitta. The scales appear bifid at times as in the 

 European genus Pachnephorus., and this character coupled with the 

 untoothed thorax make this species somewhat intermediate between the 

 two genera. The posterior tibiae are not emarginate, however, and the 

 distal joints of the antennae not so enlarged as usual in Pachnephonts^ 

 and the first abdominal segment not quite so long. It is one of the 

 most atypical of the species of Myochrous and forms, with the three 

 succeeding species, a little group of its own. 



MYOCHROUS INTERMEDIUS, new species 

 Plate 2, Figuke 3 



From 4 to 5 mm. in length, elongate oblong, black, somewhat shiny, 

 covered with broad brown and white scales that are easily brushed 

 off, in well-marked specimens these scales forming an interrupted pale 

 lateral elytral vitta and a spot near the apex; prothorax without 

 definite lateral toothing but angulate near the apex; elytral puncta- 

 tion not round, more triangular or star-shaped; anterior tibiae with 

 very tiny inner tooth. 



Head covered by scales down to antennal sockets, sometimes a faint 

 median line, but no distinct occipital ridges, punctation beneath scales 

 dense, fine and in lines ; lower front shining, with a few fine scales and 



