no. IT.".::. NORTH AMERICAN GEOMETRID MOTHS GROSSBECK. .'571 



over with cinereous and some black scales. Inner line of primaries 

 dark brown or black, well defined, usually complete and with the 

 scallops strongly marked. A faint cinereous line, often mixing with 

 the ground color, just precedes it. Outer line black, rather evenly 

 but strongly sinuous and succeeded by a fine cinereous line. Inner 

 area slightly shaded with brown, and with a cinereous cast on costal 

 and inner margins. Median area shaded heavily with brown, usually 

 from the center of the field to the outer line, where it frequently 

 assumes an intense brown. Outer area only very slightly shaded 

 and more or less strigate. There are two to four white submarginal 

 spots between veins R 5 and Cuj and a black spot between Cu, and Cu 2 . 

 Discal spot white, angular, linear, though sometimes reduced to a 

 small even spot. Fringe brown or yellowish. Secondaries smoky 

 with a tinge of ochreous. The transverse line brown, irregular, and 

 bordered externally by a conspicuous white line which occasionally 

 becomes quite broad toward inner margin. Three black triangular 

 marks are on the outer margin between Cu t and the inner margin, and 

 sometimes the marginal line, usually brown, is of this same color. 

 Discal spot absent or only vaguely indicated. Fringe as in primaries. 

 Beneath light brown to smoky, whitish toward inner margin of both 

 wings and more or less scattered over with dark-brown scales or 

 strigations. Outer line of primaries in part and transverse line of 

 secondaries repeated, the latter more sharply denticulate than above 

 and conspicuously marked externally with white. Discal spot of 

 fore wings as above, but marked to some extent on one side with 

 black; of hind wings large, oval and black or dark blown. Fringe as 

 above. 



Habitat. — Rossland, British Columbia, dune 8; Pullman. Wash- 

 ington, May 15 (Dyar) ; Oregon (Wright); Sierra Nevada, California 

 (Beutenmi'iller) ; California (Hulst); Nevada (Doll). 



A species resembling modestus in ornamentation, but on the whole 

 larger. The scattering of cinereous scales over the primaries and the 

 similarly colored narrow borders to the cross lines are peculiar. 



The species has not been recognized since it was first described, and 

 indeed it is doubtful whether Iluist himself knew the limits of his 

 species, as no occidental "i s probably ever reached an expanse of wings of 

 50 mm., the greatest measurement given by him in his diagnosis of 

 the species. The species from which this measurement was made 

 undoubtedly refers to giganteus, a Coloradan specimen of which is 

 in his collection labeled as a type of occidentdlis. 



The dentate antennae of the male, on which character the genus 

 Marmarea was based and of which occidentalis is the type, determines 

 to which of the two species the name should apply. 



The genitalia are stout and robust and the basal projection of the 

 clasper short and broad. The scaphium hook is provided with a 

 shoulder, as in behrenmrius. 



