WM. G. DIETZ, M.D. 39 



the dorsal margin and margined with white in its costal portion ; two 

 dark spots at end of cell and a nebulous spot on dorsal margin beneath ; 

 cilia gray. Hindwings narrower than the forewings, not acutely 

 pointed ; cilia gray with yellowish tint, with yellowish basal line." 



Identical with H. triangularisella Ch. Have examined 

 both types in the Cambridge Museum, and there is no doubt 

 about their identity. Zeller's type came from Texas, while 

 Chambers' came from Kentucky. The latter is an unspread 

 specimen, type label 1550 in Chambers' handwriting. The 

 wings of the left side are wanting. 



Zeller's type of sciaphilella, a male in good condition, 

 presents a peculiar dimorphism of the two hind wings, left 

 hindwing eight veins, 3+4 short stemmed, 5 connate with 

 stem, right hindwing seven veins — Blastobasis, this then very 

 readily explains the confusion hitherto existing as to the 

 position of this species. According to the law that the pres- 

 ence of a quality is dominant over its absence ; or, that a 

 retrogression or retarded condition is recessive to the more 

 developed condition, enforces the reception of this species 

 into the genus Holcocera. 



The type bears the green label in Zeller's handwriting, 

 number 1713, Texas, Dallas, Boll. 



I add the following notes to the original description : 



Palpi long, terminal joint slender, three-fourths the length of the 

 second, the latter fuscous within and without, apex white, the terminal 

 joint sprinkled with fuscous scales. Front grayish-white with some 

 lustre, vertex fuscous. Basal joint of antenna? one-half longer than 

 wide, white, dusted with fuscous, pecten long, fuscous ; shaft of 

 antennas fuscous above, paler beneath, excised above the base, tuft 

 within the excision truncate, scarcely pubescent. Thorax grayish- 

 white suffused with fuscous, particularly on the disc, with some faint 

 lustre. Forewings moderately wide, not acutely pointed ; ground color 

 pale grayish-white, speckled and marked with fuscous-brown, having 

 a purplish lustre, as follows : Base, limited externally by a nearly 

 straight line, followed by a white fascia, narrowed almost to a point 

 on the costa and angulated externally, summit of angle in the fold, 

 shaded in costal portion by a very pronounced nearly triangular patch, 

 which becomes effaced outwardly ; a much less pronounced opposite 

 dorsal patch ; no spots in middle space, two spots at end of cell, a pro- 

 nounced patch on dorsal margin below end of cell, and a larger but 

 less distinct one a little beyond the end of cell, on costal margin ; 



TRANS. AM. ENT. SOC, XXXVI. MARCH, 1910. 



