264 MEMOIRS ON THE COLEOPTERA 



Possibly rufula Hald., from Lake Superior, may also enter this 

 genus, but I have no example of it at present. 



Stenostrophia n. gen. 



The ornamentation in this genus is wholly unlike that observable 

 in any of the preceding, excepting Xestoleptura, where it is foretold 

 in such species as corusca. The species composing Stenostrophia 

 are small in size, rather narrow, though moderately inflated and 

 suboval in the female; they are, so far as discovered, tribalteata 

 Lee., serpentina Csy., and coguilletti Linell all from the Pacific 

 coast regions. Serpentina has been hastily united with tribalteata 

 but is a valid species, differing greatly in the structure of the antennae, 

 particularly those of the male, where those organs are long, slender 

 and filiform, being scarcely at all shorter than the body and are 

 constantly testaceous in color throughout; in tribalteata they are 

 much thicker, shorter, more compact, differ less sexually and are 

 always deep black in color. My two examples of coguilletti , from 

 San Diego, indicate remarkable sexual diversity, the pubescence 

 of the female being longer, coarser and very dense, with the 

 punctures of the pronotum strong and extremely close-set, while 

 in the male the pubescence is shorter, finer and sparse, the 

 punctures of the prothorax being finer, feebler and notably sparse 

 throughout. I have noted no such sexual characters in the allied 

 tribalteata and serpentina, and it would be desirable to have more 

 material, carefully collected, before announcing these differences 

 as wholly due to sex. The large series in the National Museum, 

 from which Linell described the species, includes both the forms 

 mentioned. 



Strophiona n. gen. 



In this genus the species are stouter than in any other, very con- 

 stantly and distinctively ornamented by transverse pallid bands, 

 but in a way quite different from that characterizing the preceding 

 genus, from which also they differ in the more prominent sides of 

 the prothorax and form of the third hind tarsal joint. The de- 

 scribed species are nitens Forst., from the Atlantic regions and 

 l<zta Lee., from California. The six species in my collection may 

 be outlined as follows, the ornamentation being of the same type 

 throughout, with only more or less slight variation: 



