104 PROCEEDINdS OF THE NATIONAL MUSEUM. 



13 are a little smaller than tlie otliers and tliose on 5 and 12 have a 

 central, tran.sverse, deprossed, narrow l)Ia«;k line, very faintly reaoliing 

 between wartH 1 and II, as if about to (livid<; the patch. Waits 1 and 

 II white, III to VI shining black, sinjj^le haired except VI, which bears 

 two or three hairs. Hairs short black, two on each side of tlie cervi- 

 cal shield, seta II on Joints 5 to 10, 12 and l."5 very large, long, S])atu- 

 hite, and striated. Ijength, 3.S mm. 



Cocoon. — "Leaves fastened togetlu^r with a few threads" (Harris). 



Food i>lantH. — Hickory, birch, elm, apple. 



ACRONYCTA TRITONA Hubner. 

 (riiitos II, fif,'. !», iidiilt; XV, li{,'. 9, iniixillji; XXI, fig. W, inalo giinitiilia.) 



Triaena trltona Hi':iiNKi{, Zutni(!t;c, 1818, ]>. 21, li<,'H. 107, 108; V(Tzcic,liuisH, 1818, 



]). 201. 

 Atronycta trilona Utkni'-.k, .Spec, (ien., Noct., 18.')2, I, p. 42.— Walk HK, Cat. Urit. 



MiiH., Hot., 18.-)6, IX, )). .">3. 

 Apalela tritova (JitoiK, Can. Kiit., VII, 1875, ]>. 221; Can. Knfc., 1880, XII, p. 87; 



Papilio, 188:5, III, \>. t)8. 

 Uyhoma trilona iiiu>'\K, Mittli. a. <1. liociii. Miih., Ilildc.Kli., No. 3, ISilfi, p. 7. 



Ground color very dark bluish gray, with a more (U' less distinctly 

 marked fuscous suffusion. Head and thorax without distinct mark- 

 ings. Primaries with the traiisvers(; markings mostly ind<'finite. IJasal 

 line wanting or only vaguely indi(;ated on the <5osta. Transverse 

 anterior line very feebly marked, in the best case geminate, brown, 

 outwaidly obli(|ue, a little out(!iirved b(;tween the veins. In many 

 cases it is entirely obsolete. The median shade is marked by an 

 obli(pie streak fi'om the costa^ (!rossing the reniform. The transverse 

 ])osterior line is singles, black, somewhat irregularly shaded outwardly, 

 ])re<eded by a very narrow ])ale line. It is rather squarely bent over 

 the cell and incurved in the siil)m(Mlian int(Mspace. A brown, smoky 

 shading beyond the transverse posterior line merges gradually into 

 the ground color, interrupted by a broken subterminal line, which is 

 sometimes sitarcely traceable. There is a series of discal terminal 

 spots, beyond which there is a discal line at the base of the fringes. 

 There is a bla(;k streak at base, extending to the inner i)ortioii of the 

 transverse anterior line. A ])i'oininent black streak ext(Mids inwardly 

 from Just above the anal angle through the transverse posterior line. 

 This is diffusely shaded with black and forms the most prominent 

 chara(5ter on the otherwise very evenly colored wing. The ordinary 

 si)()ls are very I'eebly maiked; the orbiciihir is small, round, of the 

 ground color, very faintly outlined, and sometimes scarcely traceable. 

 The reniform is indelined, of moderate size, kidney shaped, and a little 

 shaded with brown. The secondaries are smoky in both sexes, darker 

 outwardly, but as a whole paler in the male. Ueneath it is whitish- 

 powdery, with very feebly marked outer lin(;s and discal spots, which 

 are in many cases entirely absent. 



