307 



they are not to be separated, although from the specimens first received 

 a variation in the number of the antennal joints raised some doubt. 

 We find, however, after the examination of nearly one hundred speci- 

 mens of individuals reared from wheat from various sections that the 

 joints of the antenna iu the male range from 16 to 20 and in the female 

 from 10 to 19. 



Introduction of Icerya into Honolulu and its Extermination through the 

 Vedaiia. — We call attention to some interesting facts in the Extracts 

 from Correspondence, showing the introduction, doubtless from Cali- 

 fornia, into Honolulu, of the Icerya, and the effective manner in which 

 the Yedalia, also purposely introduced to destroy it, succeeded in its 

 mission, as it did in California. This second illustration of the effec- 

 tive work in this particular direction done by the Vedaiia lends great 

 probability to the similar extermination of Iceryas in Egypt and in the 

 West Indies by the introduction of the Yedalia, which we are now at- 

 tempting to bring about. 



The Plum Gouger and the Cucuiio.— ^6 have hitherto made no mention 

 of the results of Prof. C. P. Gillette's experiments as detailed in Bul- 

 letin No. 9 of the Iowa Agricultural Experiment Station. Yet so far as 

 they relate to the Plum Gouger they are novel and well worth record 

 in these columns. The author has adopted the excellent plan of bring- 

 ing together his conclusions at the end of his paper and these are in 

 such shape that we quote them : 



1. The gonger appears upon the trees much earlier in the spring than does the cur- 

 cnlio. 



2. The gouger is much more injurioas than the curculio to native plums on the 

 grounds of the Iowa Agricultural College. 



3. The gouger very much prefers the native to the domestic variety. 



4. The examination of over 24,000 native plums, from not less than eighteen dif- 

 ferent trees of many varieties, showed a little over 27 per cent, of their fruit to be 

 injured by the gouger. 



5. The gougerstake no food in the fall after emerging from the plums. 



6. The gouger has at least one parasite that preys upon it while in the pupa state. 

 The parasite is Sigalphus canadensis. 



7. The season's experiments indicate that London purple, as recommended for the 

 destruction of the curculio, is of little value for the destruction of the gouger. 



^. The gouger is not able to come to maturity iu fruit that falls from the trees be- 

 fore the middle of July. 



9. Fruit infested by the gouger does not ripeu or fall prematurely. 



10. About 26 per cent, of the punctures of the gouger result in the production of a 

 beetle. 



11. Jarring the trees and collecting the beetles and gathering stung fruit from the 

 trees before the 1st of August are the best remedies at present kuown for the gouger. 



12. The curculio prefers the domesticated to the native varieties of plums. 



13. When eggs are deposited in native plums, the curculio develops as well in them 

 as in the domestic varieties. 



