168 Journal New York Entomological Society. ^^°^- xxvi. 



Silis difficilis var. carbo new variety. 



Size, shape, and sculpturing of difficilis but entirely black. 



Type and paratype in my collection, the type from Bubbs Creek 

 Canon, Kings River, California, altitude 9,700 feet, collected July 9, 

 1910, paratype Rea Lake, Fresno Co., Cal., altitude 10,500 feet, col- 

 lected July 20, 191 o. Besides these, I have twelve more specimens 

 in my callection, all males, collected at the some general time and 

 in the same region, the high Southern Sierras, and have also seen 

 others in the collections of Mr. Ralph Hopping and of Cornell 

 University, the specimen in the latter collected by Professor J. C. 

 Bradley. This dark variety seems to somewhat replace the variety 

 flavida at the higher altitudes of the Sierras. 



Silis atra Lee. 



Silis atra Lee, Trans. Amer. Ent. Soc, Vol. XII (1884), p. 22. 



This species superficially resembles S. difficilis var. carbo, but it 

 has a narrower and less explanate prothorax, with sides more par- 

 allel and straight, the incisure less deep and the marginal angles less 

 pronounced, the ante-basal process shorter and blunt, not spiniform, 

 the antennae finer, and the size generally smaller. From cava, to 

 which it is compared by LeConte, it differs not only in color, but in 

 having longer antennae, a more broadly opened incisure, and nar- 

 rower ante-basal process. 



Silis cava Lee. 



Silis cava Lee, Trans. Amer. Ent. Soc, Vol. V (1874), p. 61 ; Trans. 

 Amer. Ent. Soc, Vol. IX (1881), p. 57 



We have in this species the palest member of the genus, it having 

 the legs to a great extent yellow, a feature which the females share 

 with the male. It is also quite constant in character and quite dis- 

 tinct. Its range is throughout most of the lowlands of western 

 Oregon and northern and central California, and it invades the 

 Sierras to a certain extent. Certain specimens from the hot slopes 

 of Mt. Pinos, western Kern Co., Cal., are larger and lighter in color 

 than the general run. (Plate IX, fig. 4.) 



Silis rugosa-new species. 



Elongate, slightly shining, black with orange pronotum. Head as broad 

 as apex of prothorax, depressed between the eyes ; eyes moderately prominent 

 and widely separated; antennae three fourths length of body, quite filiform, 



