66 CALIFORNIA ACADEMY OF SCIENCES. 



Wollastonia quercicola in cottonwood logs in an advanced 

 stage of decay. The Curculios are a group of insects in 

 systematic value the equivalent to a sub- order, and known as 

 the Ehynchophora (Latreille), which bear certain intimate 

 resemblances to one another in the perfect and final forms, 

 while in their larval stage they may and certainly do differ 

 in many particulars of habit. W. quercicola belongs to the 

 Calandridse, a family abounding in species whose habit in 

 the larval stage is preeminently to feed on dry food. The 

 metamorphoses of the Ehynchophora (Latr.) are not at all 

 well known, but I have bred the following, belonging to this 

 sub-order, and have found them to be lignivorous in the 

 larval stage : 



PLA.TYRHINUS LA.TIROSTRIS Fabr. — Decaying oak stumps 

 highly charged with mycelia of a fungus. 



ScoLYTtJS DESTRUCTOR Oliv. — Dead sapwood of elm. 



Mesitis Tardii Woll. — Decaying beech. 



MoNARTHRUM HuTTONi Woll. — Yarious hard woods. 



Hylesinus crenatus Fabr. — Dying ash. 



Anthribus albinus Lin. — Old wood. 



Brachytarsus scabrosus Fabr. — Elm bark. 



Kyncolus — several species. — Bark of trees. 



The foregoing are old world species of Curculios that do 

 not affect a herbaceous diet; and the three following species 

 are of similar habits. 



SCOLYTID^. 



MoNARTHRUM SCUTELLARE Lec. — Bark of dead Quercus 

 agrifolia. 



MoNARTHRUM DENTIGE RUM Lec. — Bark of dead Quercus 

 agrifolia. 



