262 GEO. H. HORN, M, D. 



The genus as defined by the table of species is composed of quite 

 homogeneous material. Several points of difference have been observed 

 between groups of species which appear to have escaped observation. 

 The antennal character is well known and needs no further comment. 

 The point of next importance in the table is the character of the 

 thoracic sculpture accompanied by one of still more utility in this 

 family and elsewhere — the fimbriation of the tips of the middle and 

 posterior tibiae. Where the thorax is distinctly strigose the tibiae are 

 fimbriate with short, closely placed equal spinules, and in those with 

 the thorax simply punctured the spinules are unequal. It might be 

 noticed here that in genera, even those not remotely related, in which 

 there is a resemblance more or less great in general appearance, there 

 is a tendency to repeat or reproduce special characters. Among these 

 instances I might cite Conosoma, Ptomaphagus, Eucinetns^ Eustrophus 

 and Mordella, in which the tibiae are fimbriate with short equal 

 spinules. Other more minute resemblances occur in these genera but 

 this is not the place for their exposition, and with this hint for the 

 benefit of others I will defer the further consideration to the future 

 in a separate essay. 



The other characters in the table need no special comment and the 

 table is now presented as a condensation of the important characters 

 of each species. 



Eighth joint of antennae very short and transverse, somewhat narrower than 

 the seventh or ninth. 

 Thorax transversely strigose; middle and posterior tibise fimbriate with short, 

 equal, closely placed spinules. 

 Strigse of elytra not very closely placed, surface moderately shining. 



Elytra very obliquely strigose consobriuns Lee. 



Elytra transversely strigose californicus Lee. 



Strigse of elytra very densely placed, transverse. Subopaque. 



nevadicus u. sp. 

 Thorax punctate, rarely strigose near the margin; middle and posterior tibiaa 

 fimbriate with unequal spinules. 

 Inner spur of posterior tibise as long as the first tarsal joint; sutural 



stria rather feebly impressed oblitns Lee. 



Inner spur short, less than half the first joint; sutural stria deeply 



impressed pusio Lee. 



Eighth joint of antennae at least half the length of the ninth and scarcely 

 narrower. 

 Thorax not twice as wide at base as long, elytra oval gradually arcuately 



narrowing to apex parasitus Lee. 



Thorax more than twice as wide at base as long, elytra conjointly somewhat 

 triangular, rapidly narrowed from base to apex..bi'achy derus Leo. 



Of the above sspecies two are peculiar to the Pacific region, 



