INSECTS AFFECTING PARK AND WOODLAND TREES 167 



European elm case bearer 



Colcophora liniosipcnnclla Dup. 

 Curious brown, somewhat flattened cases oectirring in consideraljle numbers during 

 June and July on mined Iea\es of English and Scotch elms, probably belong to this insect. 



The writer's attention was called to the presence of this species in 1901, 

 by Mr li. T. Schoonniaker of Cedar Hill, who submitted specimens of the 

 insect from the vicinity of New York city. The statement was made that 

 the pest was so abundant as to be quite injurious to English and .Scotch 

 elms, and samples of the work corroborated the statement. Its depreda- 

 tions were also brought to oin- notice again in July 1902. Accompanying 

 the latter sending were very badly mined leaves, and apparently this Euro- 

 pean species is capable of causing a great deal of iniur\'. Bred examples 

 appeared July 26, 1901, and were submitted to Dr Howard for identification. 

 A reply was received stating that it has been determined by INIr Busck, who 

 adds that it is in all probability a recent importation. It appears to have 

 become established in the vicinity of Brooklyn, it occurs at Oyster Bay, 

 and may make its way to other places in the State and prove a pest 

 of considerable economic importance. 



Description. This species may perhaps be most easily recognized by 

 its work as shown in plate 34, figure i. It will be observed that the larvae 

 feed like other known species of this genus, by eating a circidar hole 

 through the epidermis and then mining or eating away all the delicate tis- 

 sues within reach. The mined portions are evidently limited by the larger 

 veins of the leaf and consequently the brownish blotches are more or less 

 rectangular in shape. The holes through which the; larvae do their feed- 

 ing, are well shown in an enlarged representation of their work, plate 34, 

 figure 2. The case of this little insect is about .> s inch in l<;ngth, with a 

 slight crook at the head end and with the posterior extremity somewhat 

 flattened and of a lighter brown color. The caterpillar has a light brown 

 head, a dark lirown, wi-11 dc-x'cloped thoracic shield and with a heaxih' chit- 

 inized area on the dorsum of the second thoracic seoinent. The dorsal sur- 



