253 



upon tliis or upon any of the adjacent trees, and Mr. Snow informed 

 me that he had never found these iuseotsin their early stages upon any 

 of his trees. 



From Mr. Suow I learned that a colony of about thirty adult speci- 

 mens of Orcus chalyhens, received from Mr. Lelong at the same time 

 that Mr. Snow had received his, had been j)laced upon an orange tree 

 in the grove of Mr. S. W. Preble, near Tustin. Mr. Preble was absent, 

 but his foreman showed me the tree upon which the colony of imported 

 insects had been placed. I was not able to find any of these insects 

 either upon this or any of the adjacent trees. 



I next visited Mr. Hiram Hamilton, of Orange, in Orange County, 

 and learned from him that he had received two colonies of imported in- 

 sects from Mr. Lelong. The first colony was received during the last 

 half of February, and consisted of six specimens of Orcus chalybeus and 

 a single specimen of an undetermined Scymnid. These he placed in a 

 glass jar and supplied them witli Aspidiotus aurantii to serve as food, 

 but they finally died without depositing eggs. The second colony 

 reached him during the first half of July, and consisted of about seventy 

 specimens of Orcus chalyhens^ two Lels conformisj and six specimens of 

 an undetermined Scymnid. These were placed upon an orange tree 

 thickly infested with Asphliotus aurantii, but neither Mr. Hamilton nor 

 myself was able to fiiul any trace of them either upon this or any of the 

 adjacent trees, and Mr. Hamilton informed me that he had never found 

 either the larva or i)upa of any of the imported insects upon any of 

 these trees. 



This completed my investigation of the imported insects received and 

 sent out by Mr. Lelong. Of the nine colonies of Orcus chalybeus thus 

 sent out by him, not a trace of a single one of them can be found at the 

 present time; and out of the entire number of colonies of insects, only 

 one — that at Alameda — has succeeded in maintaining itself up to the 

 present time. 



On the 2Gth of October, in company with Mr. John Scott, the Horti- 

 cultural Commissioner of Los Angeles County, I paid a visit to Mr. 

 Ellwood Cooper, near Santa Barbara, and learned from him that he 

 had received two colonies of the imported insects from Mr. Koebele. 

 The first colony was received during the first half of June, and consisted 

 of about two dozen specimens of Orcus australaskc besides a few speci- 

 mens of an undetermined species of Rhizobius. The second colony was 

 received during the first half of July, and consisted of about four hun- 

 dred specimens of Orcus australasiw and Orcus chalybeus^ principally 

 the former, also a few vspecimens of the Rhizobius and a box containing 

 the larvae and chrysalides of Thalpochares cocciphaga. The latter was 

 placed in an olive tree infested with Lecanlum olea', the lid of the box 

 having first been removed and a piece of wire-screen placed over the 

 box, the meshes in this screen being large enough to admit of the es- 

 cape of the moths. The remaining insects were liberated among some 



