Sept-Dec, 19 is.] Van Dyke : Revif.w OF Genus Silis. 169 



the median joints hardly serrate. Prothorax about one fourth broader than 

 long, as broad as base of elytra, apex broadly rounded, sides straight in front 

 and but slightly divergent backwards, moderately excavated posteriorly, the 

 anterior angle of the incisure rounded, the posterior small but acute and de- 

 cidedly carinated, the ante-basal process short, compressed, rounded at apex 

 and slightly curved forwards, the base lobed, the disc feebly convex, with the 

 longitudinal impression fairly well defined posteriorly, the basal foveoe rather 

 shallow, and the anterior and posterior margins but moderately reflexed. 

 Elytra about four times as long as prothorax, with sides quite straight but. 

 slightly diverging backwards, the disc scabrous and finely pilose. Beneath 

 shining in front, abdomen finely transversely wrinkled and subopaque, the 

 seventh ventral segment deeply excavated as usual. Length 4.5 mm., breadth 

 1.7s mm. (Plate IX, fig. 5.) 



The female differs by having the prothorax orange with darker 

 margining, the sides straight and almost parallel to the nonexcavated 

 but obtuse hind angles, and the antennre but about half the length of 

 the body. 



Type male and female in my collection, taken by myself on Mt. 

 Tamalpais, Marin Co., Cal., March 14, 1909. A series of eighteen 

 more specimens from the same locality and one specimen from Fort 

 Bragg, Mendocino Co., Cal., collected December 21, 1914, are also 

 in my collection, and I have seen besides good series from Marin 

 Co., Cal., in the collection of Dr. F. E. Blaisdell. 



This species is structurally closest to cava but easily separated 

 from that by color as well as the details of the armature. Super- 

 ficially it resembles vidnerata and S. pallida var. maritima, but can 

 be distinguished by being smaller and proportionally shorter, by 

 having the pronotum entirely orange except for a black margin, by 

 having smaller and more filiform antennae, the prothoracic incisure 

 narrower and with the posterior angles of the same more prominent, 

 the basal thoracic foveas shallower, and the elytra decidedly scabrous, 

 not merely punctate, a character which will assist in separating the 

 females. It seems to be confined to the coastal belt of Middle 

 California. 



Silis percomis Say. 



Cantharis percomis Say, Bost. Journ. Nat. Hist., Vol. I (1835), p. 159; 



Ed. Lee, Vol. IL, p. 636. 

 ^Podabriis curtus Lee, Agass., L. Superior (1850), p. 229. 

 ^ Silis longicornis Lee, Agass., L. Superior (1S50), p. 230. 

 Silts percomis Lee, Trans. Amer. Ent. Soe, Vol. V (1874), p. 61 ; Trans. 



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



