104 



Prelimixary Llst (IF (tall-I^roducing Insects Common to 



Indiana. 



Mel T. Cook. 



For the past two yenrs the writer has beeu very much interested in 

 gall-producing insects and in the structures produced by Vhem. Among 

 other very interesting phases of this problem is the question of dlstrilni- 

 tion. We know very little of the distribution throughout the country and 

 nothing of tlie distribution in Indiana. 



My collection ot galls includes over 200 species, collected in the states 

 of Illinois, Indiana and Ohio. Those collected in Indiana are all from 

 Putnam County and about seventy species are included. Of this number, 

 I have accurately determined forty species. These forty species represent 

 five orders (including Acarina) and eighteen genera. The host plants 

 represent ten orders, twelve families and fourteen genera. 



The order and families of the host plants are the following: 



Orih'ri<. Familioi. 



Salicales, Salicaceae. 



Jiiglandales, Juglandaceae. 



Fagales, Fagaceae. 



Urticales, Ulmaceae. 



( Hamanielidaceae. 



Resales, ■[ Rosaceae. 



t Caesalpinaceae. 



Sapindales, Aceraceae. 



Rliamuales, Vitaceae. 



Malvales, Tiliaceae. 



Gentianales, Oleaceae. 



Campanulales, Compositeae. 



The following is a list ol llie insects and host plants Icnown positively 

 to occur in Indiana: 



HEJIIPTERA. 



1. Hormaphis hamamelis. Fitch — Hamamelis Virgiuiana L. 



2. Colopha ulmicola, Fitcli — Ulmus Americana L. 



3. Pemphigus ulmi-fusus, Walsh — Ulmus Americana L. 



4. Scliizoneura Americana, Riley — Ulmus Americana L. 



