June, l!)l/j Arnericini TingidcB 297 



Three brachypterous specimens from Iowa; two specimens 

 collected at Ames by Prof. Ball and the other at Little Rock, 

 July 2, 1897, by the senior author. This Tingid approaches 

 A. nigricornis Champion, which has the antenncne entirely black, 

 but it also differs from that species in the costal area of the elytra. 



Corythucha ciliata Say. 



This species is well known as the sycamore or buttonwood 

 Tingid and is common throughout the eastern and central 

 portions of the United States. West of the Mississippi River 

 we have specimens from Iowa, Oklahoma, Texas and California. 

 When heavy infestations of the insects occur the leaves of the 

 sycamore tree are often very much whitened and wilted. It is 

 not uncommon to find buttonwood trees considerably damaged 

 by these insects in Ohio. During the winter the adults may be 

 collected on the trees beneath the loose bark. The mature form 

 is whitish and it usually has a brown spot on the posterior 

 portion of the tumid elevation of the elytra. Teneral specimens 

 are more or less opaque and of a milky white color. The adult 

 is parasitised by a red mite. 



Corythucha arcuata Say. 



The oak lace-bug is also a well known and widely distributed 

 species. We have numerous records for the central and eastern 

 states and west to Iowa. Prof. Sanders and Mr. DeLong 

 observed during the summer of 1916 that the leaves of Qiiercus 

 macrocarpa, on the shore of Lake Wagapasset, in Wisconsin, 

 were discolored and almost entirely destroyed. This damage 

 was also noted by them in numerous other places in the state, 

 and the insect is of considerable economic importance in 

 Wisconsin. The oak Tingid is quite variable in color, especially 

 the color bands on the elytra. In some specimens the hood, 

 lateral pronotal margins, and distal portions of the elytra are 

 almost entirely whitish and the areolae hyaline. In some cases 

 the brown band near the base of the elytra is also more or less 

 evanescent. The life cycle of this species has been carefully 

 studied by Dr. Morrill (Psyche, Vol. X, page 127-132). 



Corythucha juglandis Fitch. 



This is a very common species on walnut, butternut, and 

 linden. The color of this species is also quite variable. Our 

 collections include specimens from low^a, Wisconsin, Ohio, 

 New York, Maine, Georgia and Tennessee. 



