1909.] NATURAL SCIENCES OF PHILADELPHIA. 449 



the specimens. The wing band is uniform in the spread specimens, 

 but not strongly indicated or greatly contrasted. 



The previous records of the species are from Placer County, Duns- 

 muir, Siskiyou County, and San Francisco, California. 



Trimerotropis thalassioa Bruner. 



This interesting and peculiar species, concerning which practically 

 nothing has been published, is represented by a series of forty-nine 

 specimens from several different regions. Two males were taken, 

 August 23, on Mt. Tamalpais, one at 1,500, the other at 2,100 feet 

 elevation. On Mt. Lowe, August 8 and 24 and September 1, this 

 species was taken at elevations ranging from 4,300 to 5,600 feet, a 

 series of twenty males and twelve females being secured. Two males 

 were taken August 8, in Rubio Canyon, between 2,200 and 3,000 feet, 

 while three of each sex were secured on Santa Catalina Island, August 3. 

 Two males and a female taken at 5,000 feet on Mt. Wilson, September 

 15, 1908, and four females from Arroyo Seco Canyon, San Gabriel 

 Range, 3,000 feet elevation, October 8, taken by Fordyce Grinnell, Jr., 

 have also been examined. 



The favorite habitat of this species was found to be practically the 

 same as that of Morsea californica. The insect was found plentiful, 

 especially on Mt. Lowe among the manzanita bushes on the higher 

 slopes. Owing to their lack of wariness and usual short flight speci- 

 mens were easily taken. They were noted to alight almost invariably 

 upon the manzanita bushes. 



The Mt. Tamalpais specimens are quite small when compared with 

 the Mt. Lowe individuals; the Mt. Wilson, Arroyo Seco Canyon and 

 Rubio Canyon representatives also being appreciably smaller than the 

 Mt. Lowe series, but the difference is not as great as in the Mt. Tamal- 

 pais specimens. The Santa Catalina Island specimens are also smaller 

 than the average Mt. Lowe individual. Average individuals from the 

 localities represented measure as follows : 



