HENRY SKINNER 



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spot each in cells three and two. The rows of pale brown spots on the 

 secondaries are strongly relieved by the dark ground. The margins of the 

 wings bear a black marginal line, obsolete toward the apex of the primaries. 

 Expanse of wings 1.10 inch; length of body 4.08 inch. Habitat Colorado." 

 Described from a single example, 



I am unable to separate this from persius. Differences in the 

 genitaha have not been found. It may be considered a hght 

 colored variety of persius. 



Records.— Yosemite, California (Dyar); Arizona, 1883, (Morrison); 

 Prescott, Arizona, VII, VIII, IX; Northern Sonora (Morrison). 



var. pernigra Grinnell, Ent. News, xvi, 14, 1905. 



"Upperside: primaries entirely blackish-slate, with a very thin sprink- 

 ling of grayish hairs; three very small, white dots arranged diagonally, in 

 the costo-apical part of the wing. Secondaries: entirely seal-brown, with 

 long hairs along the inner margin and basal part of wing. Underside of 

 both wings entirely Van Dyke brown; three costo-apical white spots visible 

 through the wing. Abdomen and thorax same color as adjacent parts of the 

 wings. Palpi clothed with long hairs. Antennae entirely of same color as 

 the primaries on the upperside. 



Habitat: Mt. Tamalpais, Marin Co., California. Collected by Mr. 

 F. X. Williams, May 19, 1904, in Mill Valley, on the slopes of Mt. Tamalpais. 

 Only a few were captured but others were seen; the species is no doubt 

 extremely local in distribution. Type 1 male, to be deposited in the collec- 

 tion of the California Academy of Sciences." 



"This species is very distinct from any other by its small size, and very 

 dark, almost uniform color. Owing to a curious asymmetry in the clasps of 

 the single male I possess, the description of these organs will have to be 

 deferred till more specimens are available." 



Of course the asymmetry Grinnell describes is the normal con- 

 dition in this genus. We have two males from the type locality, 

 taken May 27 and 28 and . presented by Mr. F. X. Williams. 

 Pernigra is evidently a dark form of persius. Dyar (Journ. N. Y. 

 Ent. Soc, XIIII, 121, 1905) says pernigra represents the eastern 

 persius in California, but is separable therefrom by the very dark 

 coloration. 

 Thanaos lilius Dyar, Proc. U. S. National Museum, xxvii, 788, 1904. 



"Two specimens. May 31, June 4. This form resembles lucilius Lintner, 

 but is larger, the wing more variegated with brown, which shows distinctly 

 in a patch at the end of the cell, cut by an erect dark line on the cross vein. 

 Otherwise it is very similar. The size is that of marlialis, but the markings 

 are diffused and not as contrasted as in that species. It is the western repre- 

 sentative of lucilius, probably a geographical race of it, but is as much 

 entitled to specific rank as several other species of the genus. I have speci- 



TRANS. AM. ENT. SOC, XL. 



