212 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



Redescribed from material reared from swellings on rose stems 

 collected in New Jersey. 



Type locality. — Germany. Present location of type unknown to 

 the writer. 



DISTRIBUTION 



In the United States : 



Connecticut: Darien, reared (J. D. Bourger). Norwalk (W. E. Britton). 



Massachusetts: Hopkinton, June 7, 1925; Southborough, June 17, 1923 (C. A 

 Frost). 



Michigan: Ann Arbor, reared June 18, 1926 (B. W. Erlanson). 



New Jebsey: New Brunswick, May 19; Plainfield, June 4 (A. S. Nicolay). 

 Elizabeth; Millburn ; Rutherford; Springfield; Englewood (H. B. Weiss) ; 

 Nutley (E. L. Dickerson). 



New York: New York City (intercepted in rose stock from France and Hol- 

 land). 



Pennsylvania: West Chester, June; Erie and Girard (F. M. Trimble) ; Presque 

 Isle (Craighead and Knull) ; Philadelphia (J. N. Knull). 



Variations. — This form is rather constant except in size. The color 

 varies slightly from olivaceous bronze to brownish cupreous, and the 

 prehumeral carinae are rather sharply defined in some examples, 

 whereas in others they are only feebly indicated. 



Host. — This variety was described from beech, but the European 

 host plant records are confused with viridis and its many varieties 

 and aberrations. In the United States the form described above 

 makes galls or abnormal swellings on the stems of Rosa rugosa, Rosa 

 blanda, Rosa multi-flora japonica, Rosa rubrafolia, Rosa nitida, Rosa 

 setigera, Rosa hugonis, and the wild rose (Rosa Carolina). 



This insect was first discovered in this country during August, 

 1923, by Harry B. Weiss and E. L. Dickerson while inspecting nur- 

 series in the northern part of New Jersey, where it had killed a 

 number of roses. At first it was supposed to be a variation of politus 

 Say, but C. A. Frost sent specimens to Charles Kerremans, who re- 

 plied as follows : " I have examined your Agrilus very carefully and 

 it seems to be a variety of the European vimdis Linn, and it resembles 

 very closely the variety fagi Katz., but is smaller. The elytral sculp- 

 ture and the bronze copper coloration are the same, only the head is 

 a little more irregular and the front being less smooth. It presents 

 all of the specific characters of viridis, but fagi is not, on. the whole, 

 as coppery colored as viridis." 



I do not believe this is the true fagi described by Katzeburg which 

 breeds in beech in Europe, but I have been unable to get authentically 

 identified specimens for comparison. 



This introduced variety resembles very closely some forms of 

 politus, and great difficulty will be experienced in separating some 

 examples from that species, and especially those that have been col- 



