14 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 



distinguishable from the latter. Beneath and legs densely covered 

 with cinereous scales ; anterior tibial denticulations distinct, ventral 

 edge of posterior tibia slightly convex longitudinally and with a few 

 yellowish spines in addition to the fine hairs. A very short length of 

 metepisternal suture visible opposite rear coxa. 



Type locality. — Truckee, Calif., 5,800 feet. August ; Wickham ; i (^. 



Type.—U.S.^M. no. 50651. 



The small size, narrow form, relatively wide apex of prothorax, 

 smooth pronotum, and short elytral setae are distinctive features of 

 this species. The single specimen is the only recorded male in 

 Xcopanscopus. 



P. wickhami and squamifrojis dififer from all described Panscopus 

 (sens, lat.) in the smooth coating of scales on the pronotum. Horn's 

 species acqualis is a complex unit that ranges from Colorado. Utah, 

 NcA^ada, and California north to Alberta, Saskatchewan, and North 

 Dakota. Horn's original description calls for " Kansas to British 

 Columbia." 



Subgenus NOMIDUS Casey 



Nomidns Casey, Ann. New York Acad. Sci., vol. 8, p. 818, 1895 (Coleoptero- 

 logical Notices 6). (Monobasic type, A'^. abntptus Casey, loc. cit., p. 819.) 



Including the two described herein, there are now 10 named forms 

 referable to this subgenus. Though all of them appear to be at least 

 subspecifically distinct, they are not susceptible of satisfactory dicho- 

 tomous arrangement on external characters ; and it is evident that 

 some other approach (perhaps through a study of J* and 5 genitalia) 

 will be necessary to place the classification on a sound basis. The 

 following key is intended merely as a guide to the original descriptions 

 of the various forms : 



1. Dorsal scales, in part, green; alternate elytral intervals distinctly costate ; 



scape setose only, the derm plainly visible ; rostrum rather slender, about 

 3 times as long as thick at base, and with a fine median carina (at least 

 in c?) [Humtulips, Wash, (type locality) (Pan-Pacific Ent., vol. 11. p. 9, 



1935 ) ] johusoui \'an Dyke. 



Dorsal scales not green ; scape setose and squamose, the derm more or less 

 completely covered (the prostrate scales are sometimes slender) ; rostrum 

 usually stouter 2. 



2. Hind tibia more or less bent, its lower edge broadly and feebly convex in 



profile and with some coarse brown or blackish spines in addition to the 

 setae (at least in $) ; rostrum above feebly convex in basal three-fourths, 

 more nearly continuous with front in profile, rostral carinae wanting or 



feeble 3. 



Hind tibia nearly straight, its lower edge with setae only (except some speci- 

 mens of tricai'inatns) ; rostrum a little longer in most species, usually rising 



