April, '13] :M0RRILL: ENTOMOLOGICAL PIONEERING 193 



The discovery of the Eastern peach tree borer (Sanninoidea exitiosa) 

 in two sections of Arizona has been noted in two publications of the 

 Arizona Horticultural Commisssion.^ Where observed the injury 

 was severe owing to the failure of the owners of the infested trees 

 to recognize the presence of the insects. It is strangely fortunate 

 that the insect has never been found or borer injury reported from 

 any of the important fruit growing sections of the state. I was in- 

 formed by Dr. C. P. Gillette several months ago that a similar situ- 

 ation existed in Colorado. 



Coleoptera. As a substitute for the Eastern rose chafer (Macro- 

 dadijlus suhspinosus) Arizona has a western form of the same genus 

 {M. uniformis) with similar habits.- Instead of the fig eater (Allor- 

 hina nitida) which is so common in the southeastern United States, 

 Arizona has a substitute in the misnamed "green June beetle" {AUor- 

 hina mutabilis) which has a far more destructive appetite. Peaches 

 and figs are badly and generally injured by these beetles wherever 

 grown in the state. Apples were observed to be seriously attacked 

 in one instance in eastern Arizona at Thatcher, but this visitation is 

 believed to have been principally due to the scarcity of fruit in the 

 peach orchards. The ripening fruit of the date palm is attractive to 

 several insects and among these a small nitidulid beetle (Carpophilus 

 dimidiatus) heretofore considered harmless, has been found to be a se- 

 rious enemy, breeding in this fruit in enormous numbers. Possibly 

 this is the first record of a member of this family being of economic 

 interest. Notwithstanding the impression frequently expressed to 

 the effect that the Colorado potato beetle {Doryphora decimlineata) 

 exists in the United States wherever Irish potatoes are grown, this 

 pest is of only limited distribution in Arizona. It is well established 

 and moderately injurious near Prescott at elevations slightly over 

 5,300 feet and infests only a small percentage of the farms near 

 Williams and Flagstaff, at elevations near to 7,000 feet, where the 

 principal potato growing section of the state is located. Of more im- 

 portance than the Colorado potato beetle as enemies of potatoes in 

 Arizona are three blister beetles which owing to a mishap have not 

 been determined specifically. 



The bean lady bug (Epilachna corrupta) is one of the most destruc- 

 tive beetles in Arizona. This has been observed or authoritatively 

 reported from Thatcher, Clifton, McNeil, Prescott and Taylor, rep- 

 resenting elevations from 2500 to 5500 feet. It is unknown in the 

 Salt River Valley. 



Diptera. The typhoid or house fly is as undescribably numerous 



1 Circular 16, p. 23, 1911 and Fourth Annual Report, p. 31 (1912). 



2 Third Annual Report Arizona Horticultural Commission, pp. 23-24. 



