﻿334 POMONA COLLEGE JOURNAL OF ENTOMOLOGY 



is sometimes found on a tree, but they are strictly solitary, as are all our North 

 American Papilios. P. o.vyniiis Hubner in Cuba, however, is social, the larvse 

 being commonly found gregariously on the food-plant, Xanthoxyluni (prickly 

 ash). 



It is quite probable that the "California Orange Dog" will in the future 

 be of some economic importance to the orange growers of this state. The 

 fact that the citrus industry of Tulare County is but of recent date, shows 

 how suddenly the change from a natural to an adopted food-plant may be 

 effected. Not a trace of celicayn eggs, larvas or pupae were to be found 

 on all the umbells that I observed about Porterville. Furthermore. Mr. R. W. 

 G. Wright of San Bernardino informed in recent conversation that he has 

 had caterpillars of :;elicayn from orange sent to him from Riverside. No 

 doubt the progress of civilization, destroying and exterminating, natural tood- 

 plants, has caused selicayn to make this change, such as in the case of the 

 notorious Colorado potato beetle. 



.\ number of larvae in various stages were condemned to parasites. A 

 tacliiiild flv was present in a few instances, but the majority of the parsites 

 produced were of a species of Apanteles, which emerges before the larvae has 

 attained maturity and forms a small dirty-yellowish cocoon on the leaf or 

 stem of the plant. 



As to remedies, hand-picking is by far the least expensive and most 

 practical. The .shooting of P. cresphontes had often been advocated, but 

 probably affords more entertainment than benefit. Pupation apparently does 

 not occur on the food-plant, so that the cleaning up and burning of all rubbish 

 about the trees should destroy many future individuals. 



