NO. 1506. REVISION OF MOTH GENUS ARGYRESTIUA—BIJSCK. 23 



Before the middle of eo.sta is si dark brown, nearly black, inwardly 

 oblique streak reachino- to the fold; from just beyond the middle of 

 costa runs a broader ))lackish brown faseia parallel with the tirst costal 

 streak, but reaching to the costal edge, though somewhat attenuated. 

 At apical third is a third dark streak parallel to the other two, l)ut 

 generall}' more or less diffused into the dark apical part of the wing. 

 Legs golden white, annulated with black. Forewings with veins '7 

 and 8 stalked. 



Alar expanse. — 8-i> mm. 



This boldl}^ marked species is nearest to the tw^o foregoing, but, as 

 indicated under them, quite distinct, as Zeller's tigure alone prov^es. 



Zeller's t3"pes are in the Museum of Comparative Zoolog}'; the}" 

 came from Texas (Boll). In the National Museum are identical speci- 

 mens from Cincinnati, Ohio, hy Miss A. F. Braun, and near St. Louis, 

 Missouri, and on Plummers Island, Maryland, by the writer. 



ARGYRESTHIA THUIELLA Packard. 

 Plate V, fig. 11. 



Buccnlatrlx thuiella Packard, Amer. Nat., Y, 1871, p. 152; Rept. U. S. Entom. 



Com., V, 1890, p. 917.— Riley, Rep. Ins. Mo., IV, 1872, p. 51.— Dyar, 



Bull. 52, U. S. Nat. Mus., 1908, No. 6250. 

 Argi/resiJtia sp., Fletcher, Rept. of Entom. Can. Dept. Agr., 1905, p. 189. 



Palpi, head, and face white, antenna? with brown annulations. 

 Thorax white. Forewings pearly white with brown markings; base 

 of costal edge light golden brown; at l)asil third is a small brown dor- 

 sal streak; on the middle of the wing is a larger brown dorsal streak, 

 sometimes reaching nearly to an opposite small brown costal spot, but 

 generally ditfused and interrupted before then; at apical third is a 

 nearly complete narrow brown fascia and around the apical edge is a 

 series of small dark-brown dots. These markings are quite variable 

 and often much diffused; in some specimens the entire basal half is 

 nearl}" immaculate white and the markings contined to the gradually 

 darker apical spots; in other specimens the entire wing is slightly 

 sprinkled with irregular ill-defined brown spots. Hindwings, light 

 fuscous. Legs yellowish white. Veins T and 8 in the forewings stalked. 



Alar expanse. — 8-9 mm. 



Hahltat. — Maine (Packard), Canada (Fletcher), Pennsylvania (Dietz). 



Foodplant. — ■ Thuja occidental is. 



This neat little species can not easily be confused with any other 

 described American Argyresthia, in spite of the variation in markings. 

 A very large series was lately bred by the writer f i-om Thuja branches 

 sent from Dr. J. Fletcher, Ottawa, Canada. The larvte mines the 

 terminal shoots, leaving them dead and discolored, and Doctor Fletcher 

 stated that the species did considerable damage in his neighborhood to^ 

 ornamental Thuja, as was also very evident from the material sent. 



