418 The Ohio Journal of Science [Vol. XIX, No. 7, 



Corythucha ciliata Say. 



In Missouri Hollinger took several specimens, including both 

 nymphs and adults,- upon ash {Fraxinus sp.), hickory {Carya 

 ovata) and paper mulberry {Broussonetia papyrifera). The 

 primary food plant of this insect is sycamore, Platanus 

 occidentalis. 



Corythucha gossypii Fabricius. 



Eggs, nymphs and adults were found upon castor bean in 

 Florida during the summer of 1918. The reported food plants 

 are cotton and Ichtyonethia piscipida. Specimens from Florida, 

 West Indies and Mexico show much variations in color. 



Corythucha celtidis Osborn and Drake. 



Specimens have been examined from Ohio, Kentucky, Ten- 

 nessee and South Carolina. The specimens from Tennessee are 

 considerably darker in color and slightly larger than types or 

 other specimens from central Ohio. The Ohio and South Car- 

 olina specimens are from hackberry. 



Corythucha obliqua Osborn and Drake. 



It is impossible to separate Corythucha macidata Van Duzee 

 (according to paratype kindly sent to me by the author) from 

 this species and macidata should be placed as a synonym of 

 obliqua. In Prof. H. G. Barber's collection Gibson determined 

 an almost typical form of obliqua from California (called 

 C. fuscigera by Van Duzee and later described by him as 

 macidata) contaminata. In my collection Gibson identified 

 teneral or off-color forms of obliqua from Moscow, Idaho, as 

 contaminata. Obliqua is somewhat variable in size and color and 

 it is not uncommon to find both color bands of the elytra more 

 or less evanescent. The hood varies slightly in size, but not 

 near as much as it does in a few other species. Contaminata 

 may prove to be a variation or variety of obliqua, but at present 

 it seems best to consider contaminata a distinct species until 

 type has been examined. Obliqua is one of the most common 

 tingids in the western part of United States and feeds on 

 Ccefiothus spp. 



Gibson quite erroneously states (Trans. Am. Ent. Soc, 

 Vol. XLIV, p. 82) that Osborn and Drake place contaminata 



