94 MEMOmS OF THE NATIONAL ACADEMY OF SCIENCES. 



black, and sprinkled with black scales. Then a rather wide hurt' or fawn-color shade, through which runs a waved 

 rather indistinct blackish band. Behind this fawn-color band is another of white or silver-gray, edged with a 

 conspicuous dentate black line, with some black scales toward the apex. The space behind the dentate line is pale 

 gray. Fringe whitish, iiccked with black. Secondaries yellowish gray, shading into dark smoky toward th& 

 margins. Underside sordid white, darlc on the apex of the primaries, with faint traces of the median band. 



Expanse of wing's, 30 mm. ; length of body, 12 mm. ; 3 j? , 1 9 . 



Denver, Colo., Hy. Edwards. 1 (^ , Montana, Coll. Neumoegeu. 



California (French) ; (i. riileiidK. Colorado. Montana (French) ; G. rupta, Colorado (French) ; G. albofascia, Utah 

 (French). 



G. ridcmla (flgs. 5, 0, PL VIII, tig. 7) Edw. i.s very closely allied, representing G. triUneata iu 

 Colorado. The Edwards collection contains .'! S . I have a 9 from Colorado which I compared 

 with Mr. Edwards's type specimen "before his death. Its venation is the same as in G. trilineafii; 

 its body and wings are paler gray, the broad median band on the fore wings is clearer, and pale 

 tawny yellowish. It is not improbable that C. ridiuda will ultimately prove to be merely a climatic 

 variety of the Eastern trilbwutu. 



G. rupta Edw. (PI. I, fig. 9) 1 9 , Colorado, I regard as a variety which slionld be united with 

 G. ridenda. The single (type) specimen is a 9 , without antennic or abdomen. 



It is of the same size aiul with the same shape of wings as in G. ridciiild. Head and prothoras 

 paler than iu G. ridenda. Fore wings jiale gray, as pale as in ridenda and whiter than in triUneata; 

 base of wings pale, with a black longitudinal streak, a little oblique on the costa, and behind is a 

 diffuse black irregular band; the inner line is black, and as in ridenda. The inner black line 

 forming the inner border of the luteous or tawny yellowish median band is very distinct, oblique, 

 not bent outward, as in ridenda. The band is much narrower than in ridenda, the outer and inner 

 black lines nearly meeting on the inner edge of the wing. The outer line is not so much bent on 

 the costa. No middle line present. The space beyond the narrow pale line Just beyond the outer 

 line is dusky, much as iu ^r(7/Me«/((, where it is jialein ridenda. Subiuarginal scalloped line not so 

 near the edge of the wing as in ridenda. Fringe checkered as in ridenda and triUneata. The hind 

 wings are as in ridenda, with no transverse line. Beneath as in (;. ridenda, but with a broad dusky 

 cloud on the outer fourth of the fore wings, not reaching the edge. 



G. albofascia Edwards (PI. I, figs. 7, 8). — The 2 S type specimens are from Utah, and seem 

 to be only a pale form of G. ridenda, probably due to its living in a drier, less rainy, more sunny 

 region. It is to be noted that the Western varieties named have no longer fore wings than in the 

 Eastern triUneata. It seems to be identical with G. formosa, but scarcely separable from G. ridenda, 

 being, with little doubt, a climatic variety of the latter species. The 2 $ marked albofascia 

 resemble G. formosa, only the nearly clear spaces of the latter in albofascia form dark, broad, 

 very distinct bands. There are two dark dusky patches on the hind wings. The examples 

 of G. albofascia are more typical of the species (if it be regarded as distinct from ridenda) than 

 those placed under G. formosa. 



The fore wings somewhat luteous-gray at base; on the inner third is a broad black band 

 widening on the costa and still wider on the internal edge, where it reaches a little beyond the 

 middle of the wing. A clear luteous-gray median space, beyond which on the outer third of the 

 wing is a broad black band, between which and the submarginal scalloped line is a gray band. 

 Hind wings with a diffuse broad band on the outer fourth, forming a dark patch on the internal 

 angle, and another in the independent interspace. On the underside of the wings the dark bands 

 show through, as do the two dusky spots on the hind wings. — Utah and Colorado (June, U. S. 

 Nat. Mus.). 



G. formosa Edwards (PI. I, tigs. 10-12). — Four S , all from Utah. As already stated, I regard 

 this as a synonym of G. albofascia, both species being with little doubt climatic varieties of G, 

 ridenda. 



The antennre are well pectinated, rather more so than iu G. ridenda. The wings are much 

 paler gray than in ridenda, the hind wings being almost white, but the thorax and abdomen are 

 as in ridenda. Fore wings with black scales at tlie base, but with no definite lines such as are tO' 

 be seen in triUneata and ridenda, but just beyond the base the wing is more or less luteous, as in 

 ridenda. Middle of the wing with a broad, pale, flesh-colored or luteous baud, bordered on the 

 inside by a very distinct black line, like that of ridenda, becoming wider on the costa. In the 



