INSECTS AFFECTING PARK AND WOODLAND TREES 6 1 



Natural enemies. Mr V. H. Moslic-r, as stated by Mr Kirkland, records 

 the down)- woodpecker, the bhie jay and tlie chickadee as preying on this 

 borer. Mr Kirkland adds to this list a spider, T h e r i d i u m t e p i d a r i o- 

 rum C. Koch, which he found feeding on the beetles. 



Food plants. This twig pruncr not only attacks maple and oak, two of 

 its favorite food plants, but has also been recorded from a number of others. 

 A few of the more important are: apple, pear, plum, peach, grape, quince, 

 orange, osage orange, hickory, chestnut, locust, sassafras ami sumac. 



Remedies. The fallen branches usually contain the larva and should 

 therefore be collected and burned sometime during the winter. 



Bibliography 

 1892 Lintner, J. A. Ins. N. Y. 9th Rep't, p. 357-61 



1898 Chittenden, F. H. U. S. Dep't Agric Div. Ent. Tiul. :S, n. s. p. 35-37 

 1898 Felt, E. P. Fish, For. and Game Com. N. Y. 4th Rep't ji. 392-93 



Pigeon tremex 

 Trc))icx coliiniba Linn. 



A numl)er of round holes, the size of a mediiun lead pencil, in the diseased trunk of 

 maple, elm and other trees are quite characteristic of this insect's presence. 'I'lie large 

 grub works near the center of the trunk and may be recognized by its prominent spine on 

 the posterior extremity. 



This interesting insect attacks a number of forest and shade trees, but 

 so far as observed, its operations are confined almost entirely to diseased or 

 dying trees. It is a very common insect in or about Albany where it breeds 

 in the elms which have been weakened by successive attacks of the elm leaf 

 beetle, Galerucella luteola Miill., and it also occurs in many sugar 

 maples which have been seriously injured by the sugar maple borer, 

 Plagionotus speciosus Sa)-. 



Description. The pigeon tremex is a magnificent four-winged fiy about 

 2 inches long, a wing spread of 23.2 inches and with a prominent horn at the 

 extremity of the abdomen. This latter appendage give rise to the common 

 name of horn tail, which is frequently applied to this insect and its allies. 

 This species may be recognized by its cylindric dark brown abdomen with 



