ADDENDA 289 



punctures, not much larger or sparser than those of the pygidium; 

 prosternal lobe strongly margined at apex; mesosternal marginal 

 stria strong and entire, the sinus deep as usual; anterior tibiae with 

 five coarse acute denticles. Length 5.7 mm.; width 3.7 mm. 

 Oregon fidelis n. sp. 



Elytra perfectly smooth apically, without trace of diffused punctulation; 

 striae notably fine 3 



3 Anterior tibiae with five serrules which are rather coarse and more 

 widely spaced distally. Body oblong-oval, convex, shining; head 

 with the fine ambient stria very widely interrupted; prothorax with 

 moderately converging sides, which are moderately arcuate, rapidly 

 more rounding apically; surface without punctures laterally, the 

 striae rather fine, unequally spaced, not entire and not approximate 

 behind, the inner sinuous medially and crenulate; ante-scutellar 

 stria as usual; elytra with all the striae of the merdarius section, but 

 finer than usual, subcrenulate, the fifth and sutural fine and apical, 

 the fourth not quite attaining the base; row of punctures representing 

 the humeral stria barely traceable, the subhumeral as usual, though 

 much finer and straighter than in memnonius; inflexed sides with 

 very few and extremely minute punctures; propygidium with rather 

 small and well separated punctures, those of the pygidium fine and 

 not dense, the apex smooth and more polished; prosternal lobe 

 broadly and continuously margined; prosternum transversely, 

 feebly convex, the mesosternal marginal stria deep and entire. 

 Length 4.8 mm.; width 3.3 mm. British Columbia (Victoria), 

 Wickham. One specimen planifrons Lewis 



Anterior tibiae with six or seven smaller, very evenly spaced and regular 

 serrules. Body rather more elongate-oval, less convex, polished; 

 head with a fine subpentagonal ambient stria, narrowly interrupted 

 on the front; prothorax as in the preceding, but with the sides more 

 evenly arcuate, the striae similar, the sinuation of the inner more 

 marked; surface micro-punctulate; elytra as in planifrons, but with 

 the line of punctules representing the humeral stria better marked, 

 the inflexed sides with numerous much coarser punctures; propygid- 

 ium with strong and close-set punctures, the pygidium convex, with 

 the rather small punctures even denser and subequal, the apex not 

 smooth; prosternal lobe beaded throughout at apex, the mesosternal 

 marginal stria entire, feebly crenulate, the sinus deep, acutely 

 limited at its sides. Length 5.8 mm.; width 3.8 mm. California 

 (Lake Tahoe) fractifrons Csy. 



The dentition of the anterior tibiae is inconstant in this section, as 

 may be observed from the table, and the west coast forms, as a 

 subsection, differ from the eastern species in having the thoracic 

 striaa parallel, not becoming approximate posteriorly; it is probably 

 some one of these western species that was confounded with immu- 

 nis by Dr. Horn. As memnonius Say is a valid species, it becomes 



T. L. Casey, Mem. Col. VII, Nov. 1916. 



