OF WASHINGTON. 75 



In his descriptions of new species belonging to this family, 

 Colonel Casey a gives especial attention to the clypeus and 

 clypeal margin as furnishing good taxonomic characters. The 

 structure referred to by him appears not to be the clypeus, 

 however, but to be made up of the epistoma as recognized by 

 Dietz, b Hopkins , and others, together with the produced angles 

 of the front. The latter consist in an elevated ridge on the 

 anterior margin of the front, extending between the epistoma 

 and the eye on either side. The true clypeus is very small, 

 membranous or feebly chitinized, and more or less rudimentary. 



The epistoma presents excellent taxonomic characters to be 

 recognized in the variations in its general shape and size, form, 

 and extension of the margins, its elevation or depression, 

 punctuation, surface characters, and further secondary sexual 

 modifications. In the frontal angles we may recognize equally 

 valuable characters. 



The term glabrous, as used below, signifies the absence of 

 distinct pubescence or setae ; under high power each puncture 

 can be seen to bear a very small hair, invisible, or nearly so, 

 with an ordinary lens. 



Genus CIS Latreille. 



Antennae lo-jointed, third segment longer than fourth, the club 

 3-jointed; prosternum well developed before the coxae and without 

 distinct, prominent, median carina ; lateral edges of prothorax acute to 

 apex; body varying in form, setose or pubescent, the vestiture erect 

 and bristling; anterior tibiae finely produced and dentiform externally 

 at apex, sometimes simple ; head and prothorax strongly modified in the 

 males of some species, the epistoma and frontal angles more frequently 

 the only parts affected. There is also present in the males of some 

 species a deep circular fovea at the center of the first ventral segment 

 of abdomen. 



Cis superbus, n. sp. (Plate III, fig. i). 



Female. Elongate, setose, straw-yellow ; prothorax marked with a 

 distinct piceous triangle, its apex acutely prolonged posteriorly slightly 

 beyond the middle ; elytra marked at base with a broad, piceous, tri- 

 angular spot posterior to which is a broad M-shaped band of yellow 

 followed posteriorly by a similar piceous band, the central portion of 



* Casey, T. L. Studies in the Ptinidae, Cioidae, and Sphindidae of 

 America. Journ. N. Y. Ent. Soc., Vol. vn, 1898, pp. 76-91. 



b Dietz, W. G. Notes on the species of Dendroctonus of Boreal 

 America. Trans. Am. Ent. Soc., Vol. xvn, 1890, pp. 27-32, figs. 1-6. 



Hopkins, A. D. Notes on scolytid larvae and their mouth parts. 

 Proc. Ent. Soc. Wash., Vol. vn, 1906, pp. 143-149, fig. 5. 



