12 NEW VOKK STATE MlSEfM 



The buttcrlly and motli family, Lcpitlojitcra. coiUributes some injurious 

 groups, and in adililion there are in certain famihcs a numlier ot destructive 

 species with no ec[ually injurious close relatives. 



The old ((roup Bombycidac; included some of our most deslructi\e leaf 

 feeders, such as ihr white marked tussock moth, the fall wciiworm, the 

 imported .gipsy moth and others. 



The' Cossidae are wood borers and include several rather destructive 

 forms, speciall}' th(r carpt-nter worm and the leopard moth. 



The Sesiidae are also a family of borers, some of which are rather 

 injurious to forest trees. 



Certain species of the true 1)ul;s or llemi|)lera are of considerable 

 importance because of their ilepredations on trees and shrubs. Possibly 

 the most injurious, though not usually considered so, are the plant lice, 

 which year after year make drafts on the vital lluiils of \arious plants and 

 some seasons cause very great injury. This was particularly true in 1898 

 and 1903. The scale insects belong here, and some of them cause serious 

 tlamage, not onl\' we-aki-ning trees i)ut in some instances killing them. This 

 is true of the cottony maple scale, 1' u 1 \ i n a r i a i n n u m e r a b i 1 i s Rathv., 

 and also of the San Jose scale, .\ s p i d i o t u s perniciosus Comst., 

 which latter is \er\' destructixe to certain ornamentals. 



Certain of the other orders contain species of some economic impor- 

 tance, though most of them may be disregarded in this connection. 



Literature. The American literature relating to forest c-ntomology is 

 not very abundant. The pioneer in this work was undoubtedly Dr Asa 

 Fitch, practically the tirst state entomologist, who gave considerable space 

 to the subject in both his fourth and fifth reports, thereby leaving records 

 of great value. These publications were followed by Bulletin 7 of the 

 United .States luitomological Commission, prepared by I)r Packard, who in 

 1890 extended that into the xoluminous and \aluable tilth report of the 

 commission, a work which is a veritable storehouse full of information. A 

 number of later writers have treated of certain phases of the subject, par- 

 ticularh- Dr I Io|)kins, who is easilv the American authority on the Scolyt- 



