24 PROCEEDINGS OF THE NATIONAL MUSEXJM vol. loi 



star-shaped, interspersed with finer punctures. Anterior tibiae with 

 only a faint trace of tooth. 



Head thinly covered with fine, closely, appressed white scales down 

 to antennal sockets, a short vertical line in the middle of the front, 

 punctation dense, moderately coarse, but surface not at all rugose, 

 and little trace of the usual occipital ridging; lower front without 

 scales, with a few coarse punctures. Antennae extending below 

 humeri, brown with darker and thicker outer joints, of the usual pro- 

 portions. Prothorax not quite as long as wide, convex, with a depres- 

 sion over the head and along the base at the sides; sides feebly 2- 

 toothed with a little blunt tooth at apical and basal angles ; disk with 

 fine, confluent punctures in lines, sparsely covered with short, fine 

 scales. Elytra with small humeri and a short intrahumeral sulcus, a 

 faint basal callosity; the striate punctures not round but somewhat 

 triangular, often star-shaped and interspersed with finer, shallower 

 punctures, the larger punctures becoming finer and less dense toward 

 apex; whitish scales short, fine, and not very dense. Body beneath 

 shining, densely punctate, scales fine and hairlike, first abdominal seg- 

 ment finely and moderately densely punctate, a faint depression at tip 

 of abdomen in the male, not so marked in the female. Hind femora 

 not distinctly toothed, anterior tibiae with an inconspicuous tooth 

 on inner side. Length 4.5 to 5.4 mm. ; width 2 to 2.5 mm. 



Type.—K male, U.S.N.M. No. 59025, collected June 22, 1935, by K. 

 Cooper. 



Type locality. — Sentinel Butte, N. Dak. 



Other localities. — A female, collected at Lantry, S. Dak., June 28, 

 1947, by H. C. Severin. 



Remarhs. — Only two specimens, a male and female, are known. 

 They are unique among North American species of Myochrous in 

 being inconspicuously scaly, the scales very short and not dense. 

 Otherwise the beetles resemble closely M. intermedius, which is covered 

 with broad scales. The aedeagi of both are very similar in outward 

 appearance. 



MYOCHROUS PAUXILLUS Schaeffer 

 PlATB 2, FiGUBE 5 



Myochrous pauxillus Schaffee, Journ. New York Ent. Soc, vol. 41, p. 473, 1933. 



About 4.5 mm. in length, oblong, black, shining with a bronzy luster, 

 densely covered by broad pale scales easily rubbed off, thorax widest 

 anteriorly with a distinct angularity, scarcely a toothing, visible below 

 the middle ; elytral punctures round and coarse. 



Head covered by dense, appressed, white scales down to antennal 

 sockets, the usual occipital ridges absent, a faint median line and fine 

 longitudinal lines of confluent punctures radiating from this ; lower 

 front polished and with coarse punctures and a few finer hairlike 



