1909.] NATURAL SCIENCES OF PHILADELPHIA. 447 



summit, August 8, two males, three females; Echo Mountain, August 

 8, four males; Mt. Wilson, 5,000 feet, September 15, one male; Pasa- 

 dena, August 1, one male, June 23, one male and three females, col- 

 lected by F. Grinnell, Jr.; Santa Catalina Island, August 3 and 7, 

 three males, one female; Strawberry Valley, 5,000 feet, San Jacinto 

 Mountains, July 7-9, F. Grinnell, Jr., one male, two females. A single 

 male from Ormsby County, Nevada (Baker), and another of the same 

 sex from Cuyamaca Mountains, San Diego County, California, October 

 1, 1900 (G. W. Dunn), have also been examined. 



In a recent paper 13 Mr. Caudell has shown that Trimerotropis tessel- 

 lata is not a valid species, and the material before us contains not only 

 additional evidence on this point, but also enough to relegate T. caiig- 

 nosa to the synonymy as well, wliile even the recognition of the two 

 "forms" as varieties appears undesirable, the intermediates being 

 so numerous and graduated. 



Almost one-half of the specimens in hand are spread, so the character 

 of the fuscous band of the wing, the opacity of the disk and the amount 

 of infuscation of the apex can be readily observed in a number of 

 individuals. 



The dark form, called caiignosa by McNeill, with blackish coloration, 

 the disk of the wing transparent faintly colored with greenish, and the 

 faintly fuliginous apex with the extreme tip slightly infuscated, is 

 represented by individuals from Mt. Tamalpais, Miami, Mariposa 

 Grove, Mt. Lowe, Mt. Wilson and Pasadena. One female from Miami, 

 another from Grouse Creek and a male from Yosemite Valley have 

 the metazona of the pronotum ferruginous, strongly contrasted with 

 the blackish general coloration. 



The remaining specimens present a great complex of color tones, 

 the dark shades being umber and vandyke brown, while the light bars 

 are hoary, buffy and pale ferruginous. The wing band varies from 

 very weak to well marked, while the apex is hyaline or more or less 

 strongly fuliginous, sometimes with the greater portion of its surface 

 infuscate. When the wing band is well defined the apex is usually 

 hyaline, but this is not invariable. The shade of yellow of the disk of 

 the wing varies considerably, a few specimens, aside from the caiignosa 

 type individuals, having it very weak. 



This species was found particularly common throughout the conifer 

 forests of the Yosemite region, in company with the slightly less plenti- 

 ful and less widely distributed Trimerotropis fallox. Both of these 



Proc. U. S. Nat. Mas., XXXIV, p. 75. 



