388 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXV. 



at base, tips of scales shaded with gray brown. Antenna, stalk ercani 

 fawn, annulated Avith light broAvn, branches black, cilia whitish gray. 

 Thorax light fawn, speckled with brown, shading into a whitish pos- 

 terior patch. Abdomen pale fawn, ringed above Avitli brown on four 

 anterior segments and with dark gray on three posterior segments. 

 Legs i)ale fawn, finely dusted with brown. 



Male fore wing, pale fawn, heavily dusted with brown; the ground 

 color below costa on inner third of wing and over upper and lower 

 median veins is of an ochreous shade. Tenninal line nearly obsolete, 

 only showing faintly in one specimen; it is outwardly concave op- 

 posite end of cell and sharply dentate above dorsal margin. One 

 specimen has a thin, straight Avhite line through middle of cell; this 

 specimen is of a general darker grayish brown shade, and quite 

 heavily overlaid with white scales on the dorsal margin and outer 

 half of Aving. The subterminal line is only faintly indicated by a 

 iew darker scales on dorsal half. There is a black dot at end of each 



vein in termen. Cilia brownish 

 gray, divided by a pale line. 



Hind wing pale fuscous gray, 

 slightly darker before termen and 

 apex. Cilia Avhitish, preceded by a 

 darker line; underside the same. 

 Underside fore wing broAvnish gray. 

 Described from fourteen males 

 and two females collected at Ros- 

 trcA'or, Ontario, Canada, Se})tember 

 2-16, by Mr. Arthur Gibson, in 

 Avhose honor the sj^ecies is named. 

 The females are of a much lighter 

 color than the males, caused by the absence of the heavy fuscous 

 brown sprinkling. The fore Avings are also more elongate and 

 rounded at the apex and anal angle than the male; the female hind 

 Aving is Avhiter. 



Cotype.—Csit. No. 11958, U.S.N.M., Mr. Gibson's and the Author's 

 collections. 



THAUMATOPIS ATOMOSELLA, new species. 



Fig 



8. — Head and enlarged antenna 



IF THAUMATOI'SIS gibsonella 



Expanse, 27-30 mm. 



Male antenna, unipectinate, branches four to fiA^e times Avidth of 

 stalk, shortly ciliated on each side of branches. Labial palpi slender, 

 scales closely appressed, about six times as long as Avidth of eye; 

 terminal joint drooping. Head light ochreous cream color, thorax 

 a whiter shade ; stalk of antenna Avhite, branches dark fuscous broAvn, 

 cilia Avhitish; labial palpi cream ochreous, thickly speckled Avith dark 

 fuscous and lightly sprinkled Avith white; maxillary palpi cream 



