1500 THE BUTTERFLIES OF NEW ENGLAND. 



ing rotindisli, dusky brown, submarginal spots; the brighter, central parts of the 

 lunules correspond to the spots of the upper surface; outer margin marl^ed through- 

 out by a very narrow fuscous band. Fringe as in tlie fore wings, l)ut with a slight 

 fulvous tinge, and with no pale scales. 



Abdomen purplish-brown above, becoming duller brown apically , the incisures paler ; 

 beneath grayish brown, .\lthough the specimen studied is a unique, I have been per- 

 mitted by Mr. Lintner to remove the scales from one side of the extremity of the ab- 

 domen to get a view of the abdominal appendages (36 : 33). This permitted a good 

 view of only the apical half of the right clasp and the tip of the left, the remainder 

 being concealed witliin the chitinous covering of the terminal segments of the body. 

 It is therefore only possible to describe the differences between it and martialis in tlie 

 parts seen. As judged from the other points of its structure so here it is plain that 

 its nearest affinities are with this species, for in these and in these alone the blade of 

 both clasps is abruptly bent beyond the middle. The blade of the right clasp differs 

 in its greater slenderness and prolongation ; the denticle of the upper edge is larger 

 and more prickly, so that the blade seems to narrow more abruptly beyond it, while 

 the bent apex is more distinctly conical and pointed. The bent apical portion of the 

 left clasp does not appear to differ from that of martialis. Length of fore wing, 13.5 

 mm. Described from one male. 



The single specimen here described is the only one yet known, taken 

 near Albany, N. Y., on May 12, 1871. The specimen credited by Ed- 

 wards to West Virginia I have seen and find that it does not belong here, 

 but to T. martialis. Strecker, however, credits it to the middle states, 

 Ohio, Maryland and Virginia. Naturally it is our least known butterfly. 



LIST OF ILLUISTRATIONS.-THANAOS AUSONIUS. 



Imago. 

 PI. 15, fig. 2. Male, both surfaces. PI. 36, fig. 33. Male abdominal appendages. 



GROUP IV (brizo). 



Antennal club composed of eighteen joints ; fore wings without subapical vitreous 

 spots ; male hind coxae and tibiae sometimes with, sometimes without, special appur- 

 tenances, as in Group I; costal fold of fore wings of male furnished with slender, 

 flagellate or twisted androconia; upper organ of male abdominal appendages with an 

 unarmed crest with slight, lateral expansions; terminal hooks consolidated, stout, the 

 tooth very large; clasps with well armed blades, exceptionally short as compared with 

 the body, the basal and median processes distinct, the latter armed. Eggs with fifteen 

 or less vertical ribs. Larval food diverse, principally Leguminosae and Cupuliferae. 

 A single brood in the northern United States. 



Species : brizo, icelus. 



THANAOS BRIZO.— The sleepy dusky wing. 



[The lesser dingy skipper (Abbot); black skipper (Gosse); large bluish winged skipper 

 (Maynard); sleepy dusky wiug butterfly (Packard).] 



Thanaos brizo Boisd.-LeC, LSp. AmCr. N. Araer.,lU (1862) ;— Park., Can. ent., iii : 



sept, pi. 66 (1833);— Harr., Ins. inj. Veg., 113(1871);— Scudd.-Burg.,Proc.Bost. hoc. nat. 



3d ed., 309-310, fig. 132 (1862) ;— Scudd., Butt , hist., xiii : 289-290. pi., fig. 4 I, r. u (1870) ;— 



309, fig. 108 (1881) ;— Fern., Butt. Mc., 10-4-105 Liiitn., Ent. coiitr., i : 31, pi. 7, figs. 9-10 (1872) ; 



(1884);— Mayn., Butt. N. Engl., 65. pi. 7, fig. iv: 64-65 (1878) ;—H. Edw., Stand, nat. hist., 



80, 80a (1886). ii : 474, fig. 601 (1884);— French, Butt. east. U. 



Nisoniades brizo Westw. - Hew., Gen. S., 3.i4-355 (1886). 



diurn. Lep., ii : 520 (1852) ;— Morr., Syu. Lep. Thymele brizo Gosse, Can. nat., 183 (1840), 



