Sept., '05] ENTOMOLOGICAL NEWS. 235 



A Trip to Mt. Diablo in Search of Lepidoptera, 



With a Description of a New Species. 



By Francis X. Williams and Fordyce Grinnell, Jr. 



Mt. Diablo is an isolated cone thirty miles east of San Fran- 

 cisco, in Contra Costa County, and rising to a height of 3,849 

 feet above the sea-level. Its summit is rather densely clothed 

 with chaparral which is made up mostly of Ceonot/ms cuneatiis 

 and Adeiiostoma fasciculatum. Pinus sabiniana and P. coulteri 

 grow on its sides, but occur more frequently in Pine canon on 

 the southwestern slope of the mountain. Of the genus Quer- 

 cus there were noticed the following species : agrifolia, duniosa, 

 chrysolepis, wislizenii, lobata and calif omica. The sides of the 

 mountain had frequent, large, white patches of very fragrant 

 flowers consisting mostly of Cryptanthe muriculata ; and right 

 below the summit on its southern slope were found in fair 

 abundance. Stenotus linearifolius and Eryshniwi asperian, both 

 of which were very attractive to various insects. Other plants 

 noticed on the mountain were : Juniperus calif or?iiais just 

 below the summit on the south side ; Ribes malvaceiun in 

 flower, on top ; Arbutus menziesii in the canon ; Sambuais 

 glaiica and the usual trees and shrubs of the stream banks. 



Our trip to Mt. Diablo took place from April 3rd to April 

 8th. Starting from the outskirts of Oakland at 8. 10 A. M. with 

 a good supply of grub but with too few blankets, we covered 

 about twenty-four miles the first day, walking over the 

 Berkeley Hills and through valleys surrounded by bare hills 

 but well timbered along the creek with alders, willows and the 

 buckeye. 



Nothing of much interest was caught this day. A few 

 Alypia lunata were seen but none taken. Thecla diimetorum 

 and LyccEtia behrii were taken in small numbers. One speci- 

 men of Eudamus pylades was secured as well as several 

 Thanaos juvenalis which species was just beginning to 

 emerge. The spring form of Anthocharis sara, Pieris napi, 

 and Ccenonympha californica were common and once in a while 

 a torn Vanessa antiopa, californica or Da?iais archipptcs was 

 seen. Papilio rutulus and zolicaon were seen in several places, 



