431 



Meyrick, Gen. Ins. C, 17, 1910. 



Id., Wagner's Lep. Cat. pars 17, 25, 1913. 



Walsingham, Biol. Cent. Am., Lep. Het. IV, 441, 1915. 



Barnes & McDunough, Check List 151, 1917. 

 Pterofhorus baccliaridi-s Grinnell, Can. Ent. XL, 317, 1908. 



Williams, Ent. News XX, 60, 1909 (biol). 



Meyrick, Wagner's Lep. Cat. pars 17, 24, 1913. 



Barnes & McDunnough, Check List 151, 1917. 

 Head brown, brownish white between antennae. Antennae brownish 

 white, palpi similar, becoming brown toward apex, slender and oblique, mod- 

 erately long. Legs brownish white, first two pairs shaded with brown on inner 

 surface. Thorax and abdomen pale tawny, the latter with a faint brown dorsal 

 stripe. 



Primaries ochreous, more or less heavily tinged with brown, in some speci- 

 mens almost evenly brown but usually paler toward inner margin and along 

 base of costa. Veins slightly darker than ground color on inner half of wing 

 and sometimes tipped with dark brown in both lobes. Fringes concolorous. 

 Secondaries and their fringes slightly more grayish. Expanse 34-66 mm. 



Distribution: California. We have the species from northern, 

 central and southern localities, Jtine and July. In U. S. N. M. from 

 Mexico. 



There are two types of grandis, a male and a broken specimen, in 

 the Fernald collection, and one type male in the Cambridge Museum. 

 all from California. Grinnell's two types are this species without 

 doubt; they were reared from Baccharis pilularis at San Francisco 

 by F. X. Williams, and give us our only knowledge of the life history. 

 Williams' account of these specimens is as quoted below : 

 "Description of a nearly mature larva (fig. 12). — Head pale brown, darker 

 about the mouth and along the sides, clypeus not reaching half way to vertex. 

 Body of uniform thickness, somew-hat depressed, shining white, with slight 

 creamy yellow tinge ventrad ; cervical shield strong, pale brownish, with two 

 transverse patches of small dark brownish tubercles, interspersed rather sparsely 

 with hairs, the first patch the narrower. On the second and penultimate seg- 

 ments is a less developed patch. On each side of the dorsal line an irregular, 

 rather broad and broken purple line ; subdorsad a heavier, wider purple band ; 

 and below the brownish spiracles an indistinct geminate line of the same color, 

 with an extended blotch just cephalad of each spiracle. Indications of another 

 line below lateral fold. Body with sparse brownish hairs, except on last seg- 

 ment where the heavily chitinized, dark brown anal plate is widely bordered 

 with numerous dark hairs arising from small tubercles. This plate (fig. — ) 

 which occupies obliquely half the segment contains a raised disc somewhat 

 below its middle, bearing a pair of slightly upcurvcd chitinized processes. On 

 this plate between and below the prongs are rough granulations. Feet dull 



