Report of the State Entomologist. 225 



A section of a clierry tree before me, of two inclies diameter, shows 

 still greater destruction of the surface of the sapwood. The bur- 

 rows are so close thg,t they can not be separated. In a space of one 

 square inch, thirty-two holes made for pupation can be counted. 



I have not been able in the specimens of infested wood received, 

 to make out the " mating chamber " of the beetles, or as. termed by 

 some writers, " the cradle." They were probably in the lateral 

 branches which had been removed. Dr. Hagen states that " the 

 cradle is perpendicular in most cases except where it begins just 

 below the base of a bud, and is about an inch long." He further 

 adds of the burrows: " The galleries are [sic.'] to four inches long, and 

 rather deeply injuring the sapwood. The holes for the pupa go 

 deeply, to 4 mm. in the wood " (Joe. cit.). 



Mr. Scudder, in referring to a mine of an European example of 

 rugulosus on cherry, in the Museum of Comparative Zoology at 

 Cambridge, Mass., states: "The larval mines emerge and diverge 

 from one point of the mating chamber. The main galleries [cradles] 

 are reduced to almost nothing, and the normal mine of this species, as 

 figured by Ratzeburg, shows nothing of the kind " (loc. cit). 



Strongly Attacked by Parasites. 

 Fortunately, the beetle has been met by a strong parasitic attack, 

 which it is hoped will not permit of a great increase of its injuries. 

 From S. rugulosus infested wood sent from Virginia on the twenty- 

 third of December, examples of a chalcid emerged two days after its 

 reception, from which it would seem that others may have been dis- 

 closed at an earlier date. These were sent to the Division of Ento- 

 mology at Washington for identification, where they were referred to 

 the Pteromalid genus Baphitelus, of uncertain species, but probably 

 maculatus — ■ identical with some that had been bred at the Depart- 

 ment from the same insect infesting other fruit trees in Ohio and 

 North Carolina. 



Later — in Januar}^ and February — another species of chalcid 

 appeared, characterized by two subquadrate spots on the fore-wing, 

 which Mr. Howard kindly identified as Chiropachys colon (Linn.). A 

 third species, obtained more numerously than either of the two preced- 

 ing, was referable, according to Mr. Howard, to the genus Eurytoma — 

 species not ascertained. 



Its Injuries to Clierry, Plum, and Peach Trees. 

 ■ Frequent complaints have been made within the last few years of 

 the injuries of Scolytus rugulosus to cherry, plum, and peach trees. 

 29 



