y4 MEMOIRS OF TOE NATIONAL ACADEMY OF SCIENCES. 



black, and spriiiUlod with hlack scales. TUni a rather wide butt' in- fawn-color shade, throvigli which ruus a wavsd 

 rather indistinct blackish hand. liehind this fawn-color band is another of white or silver-gray, oilged with a 

 consiiicnoiis dentate black line, witii some black scales toward the apex. The space behind the di'ntate line is pale 

 gray. Fringe whitish, decked with black. Sfcouilaries yellowish gray, shading into dark smoky toward the 

 margins. IJndersiile sordid white, dark on the apex of the primaries, with faint tracis of the median b.niil. 



Expanse of wings, 30 mm. ; length of body, 12 mm. ; 3 (J , 1 5 . 



Denver, Colo., Hy. Edwards. 1 ^, Montana, Coll. Nenmoegen. 



California (French) ; (1. riilendu, Colorado, Montana (French); (i. rupla, Colorado (French) ; G. alhufascia, Utah 

 (French). 



G. ridcniht (dgs. ."), C, PI. YI[I, fij;-. 7) Edw. is very clo.sely allied, ivin-e.'^eiitiiig O. irilineiifa in 

 Coloi'ado. The Edwards collection contains '■'>$. I have a V from Colorado which 1 coniparcd 

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

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

 tawny yellowish. It is not improbable that V. riilcnda will ultimately i)rove to be merely a climatic 

 variety of the Eastern trilineatu. 



G. rupta Edw. (PI. I, tig. 9) 1 2 , Colorado, I regard as a variety which shonld be niiited with 

 G. ridenda. The single (tyi)e) specimen is a 9 , without antenna' or abdomen. 



It is of the same size and with the same shape of wings as in G. ridenda. Head and prothorax 

 paler than in G. ridenda. Fore wings pale gray, as pale as in ridenda anil whiter tlian in frilineata; 

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

 dili'use 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, obliipie, 

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

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

 the costa. No middle line present. The space beyond the nariow i)ale line Just beyoiul the outer 

 line is dusky, much as in trilineata, -where it is pale in ridenda. Submarginal scalloped line not so 

 near the edge of the wing as in ridenda. Fringe clieckered as in ridenda and trilineata. The hind 

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

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



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

 to be oidy a pale form of G. ridenda, probably due to its living in a drier, less rainj% more sunny 

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

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

 being, with little doubt, a climatic variety of the latter sjjccies. The 2 <5 marked albo/aseia 

 resemble G. formosa, only the nearly clear sjiaces of the latter in albo/aseia form dark, broad, 

 very distinct bands. There are two dark dusky patches on the hind wings. The exami)lcs 

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

 those iilaced under G. /ormosa. 



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, wliere it reaches a little beyond the 

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

 wing is a broad black baud, 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 undcrsiilc of the wings the dark bands 

 show through, as do the two dusky spots on the hind wings. — Utah and (.'olorado (June, l^. S. 

 Nat. Mus.). 



G. /ormosa Edwards (PI. I, tigs. 10-12). — Fcmr S , all from T'tah. As already stated, I regard 

 this as a synonym of (^V. ((^//q/Vr.sx'm, both si)ecies being witli little doubt climatic varieties of G^. 

 ridenda. 



The antennae are well pectinated, rather more so than in G. ridenda. The wings are much 

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

 as in ridenda. Fore wings with black scales at the base, but with no definite lines sudi as are to 

 be seen in trilineata and ridenda, but Just T)eyond the base the wing is more or less luteous, as' in 

 ridenda. .Middle of the wing with a l)road, pale, flesh colored or luteous baml, bordered on the 

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



