70 CALIFORNIA ACADEMY OF SCIENCES. 



thicker in texture than any other part. The legs are prom- 

 inent. Feed upon rootlets of Umbellularia Californica. It 

 is much infested with a small, pale-colored mite which is 

 evidently parasitic on the species. 



LUCANID^. 



Platycerus Oregonensis (Westwood) — Dead trees of 

 Photinia arbutifolia, Umbellularia Californica, Quercus ag- 

 rifolia and Eucalyptus. 



Platycerus Agassii Lee. — Decayed trees of Arbutus 

 Menziesii; also in wood too much decayed to be identified. 



Sinodendron rugosum Mann. — Decayed oak, Quercus ag- 

 rifolia. 



The 522 North American species of Cerambycidse are all 

 borers; the insect deposits its egg in a hole perforated in 

 the wood, and the larva penetrates further and further ac- 

 cording to a rhythmic order peculiar to the species until its 

 metamorphoses are completed. The following is a list of 

 the Calif ornian species whose habits I have observed: 



CERAMBYCID^. 



Ergates spiculatus Lee. — Eotting coniferous trees. Bred 

 from Sequoia sempervirens, Pinus insignis, Abies Doug- 

 lasii, etc. 



Prionus Califorjticus Mots. — Bred from rotten damp 

 roots of Quercus agrifolia. 



AsEMUM NITIDUM Lec. — Decayed Pinus insignis. 



Hylotrupes ligneus Fab. — Dead trees of Libocedras 

 decurrens. 



Elaphidion imbelle Lec. — Bred from decayed oak near 

 San Diego, Cal., by F. E. Blaisdell. 



