Sept-Dec, 19 18.] VaN DykE : REVIEW OF GeNUS SiLIS. 171 



the base broadly lobed, all margins rcflexcd, the disc with deep foveae at base 

 just within the incisures and with a shallow depression at middle but with- 

 out a longitudinal impressed line. Elytra about four times length of pro- 

 thorax, with sides almost parallel and apex quite truncate, the surface dis- 

 tinctly though discretely punctate, and finely, sparsely pilose. Length 5 mm., 

 breadth 1.5 mm. 



The female has the antennae finer and shorter, barely reaching to 

 the middle of the body, the prothorax larger than in the male, as usual 

 distinctly broader at base than base of elytra, much broader at base 

 than apex, with sides gradually arcuate to rounded basal angles, color 

 entirely reddish yellow, the elytra somewhat broader than in male. 



Type male and female in my collection, collected by myself at 

 Marshfield, Oregon, June ii and 12, 1914. Besides these, I have a 

 series of thirty-three specimens in my collection, from the same place, 

 all quite constant. This variety is exactly like pallida in every par- 

 ticular except color, differing in that in having the elytra entirely 

 black instead of a pale yellow darker at the margins. Specimens of 

 the typical species are occasionally found with the variety. S. vul- 

 nerata Lee. is very similar to the above but differs as a rule in having 

 the median prothoracic black spot prolonged to the apex, thus com- 

 pletely dividing the reddish yellow area, in having finer and more 

 filiform antennae, the prothoracic incisure deeper, with its anterior 

 angle a right angle, the ante-basal process broader and not hooked, 

 the disc with a distinct though fine longitudinal impressed line, and 

 the elytra more coarsely closely punctate and scabrous and with apices 

 more broadly rounded. 



Silis vulnerata Lee. 



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

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



This species which I at first took to be the same as the preceding, 

 should, however, be readily separated once the very rugose elytra are 

 noticed. It was described from Oregon. I have seen specimens 

 from Pullman and Wawawai, Wash., Coeur d'Alene, Idaho, and from 

 Colorado. It is probably an offshoot of pallida, but has diverged 

 sufficiently to be quite distinct and has as its territory the upper part 

 of the Great Basin, or the country east of the Cascades, as pallida 

 and its variety, the region to the west. 



