94 
MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 
black, and sprinkled with black scales. Then a rather wide bull* or fawii-color shade, through whicli 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, decked with black. Secondaries yellowish gray, shading into dark smoky toward the 
margins. Underside sordid white, dark on the apex of the primaries, with faint traces of the median band. 
Expanse of wings, 30 mni. ; length of body, 12 mm. ; 3 , 1 $ . 
Denver, Colo., Hy. Edwards, 1 ^ ^ Montana, Coll. Neumoegeu. 
California (French); G. ridenda^ Colorado, Montana (French); G. rupta, Colorado (French); G. albofascia, Utah 
(French). 
G, ridenda (figs, o, G, PL YIII, fig. 7) Edw. is very closely allied, representing G, iriUneata in 
Colorado. The Edwards collection contains .‘id. 1 liave a 9 from Colorado wliicli I compared 
with Mr. Edwards’s type specimen before his death. Its venation is tlie same as in G, iriUneata; 
its body and wings are paler gray, the broad median baud on the fore wings is clearer, and pale 
tawny yellowish. It is not improbable that 6\ ridenda will ultimately lU'ove to be merely a climatic 
variety of the Eastern trilincata. 
G. riqyta Edw. (PL I, hg. 9) 1 9 , Colorado, I regard as a vai'iety which should be united with 
G, ridenda. The single (type) specimen is a 9 , without aiitenme or abdomen. 
It is of the same size and with the same shape of wings as in G, ridenda. Head and protliorax 
paler than in G. ridenda. Fore wingvS pale gray, as pale as iu ridenda and whiter than in iriUneata; 
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 liitcous or tawny yellowish median band is very distinct, oblique, 
not bent outward, as in ridenda. The band is much narrower tiiaii in ridenda, the outer and inner 
black lines nearly meeting on the inner eilge of the wing. The outer hue 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 iriUneata, vehend it is palein ridenda. Submarginal scalloped line not so 
near the edge of the wing as in ridenda. Fringe checkered as iu ridenda and iriUneata, The hind 
wings are as iu ridenda, with no transverse line. Beneath as in G, ridenda, but with a broad dusky 
cloud on tlie outer fourth of the fore wings, not reaching the edge. 
G, albofascia Edwai*ds (PL I, figs. 7, 8). — The 2 5 type specimens are fi'om Utah, and seem 
to be only a pale form of G, ridenda, probably due to its living iu a drier, less rainy, more sunny 
region. It is to be noted that the Western varieties named have no longer fore wings tlmii in the- 
Eastern trilineata. 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. Tlie 2 ^ marked albofascia 
resemble G, formosa,, only the nearly clear spaces of the latter iu albifasvia form dark, broad, 
very distinct bands. There are two dark dusky patches uu 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 blagk 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 Avhich on the outer third of the- 
wing is a broad black band, between which and the submargiiial scalloped line is a gray band. 
Hind wings with a diffuse broad band on the outer fourth, forming a dark patch on tlie internal 
angle, and another in the independent intersiiace. 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 (PL I, figs. 10-12). — Four $ , dll from Utah. As ah’eady stated, I regard 
this as a syuouym of G, albofascia, both species being with little doubt climatic varieties of G, 
ridenda. 
The ant^nnee are well pectinated, rather more so than iu G, ridenda. The wings are much 
paler gray than iu rideiida, 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 such as are to- 
be seen in iriUneata 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, fiesh-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 
