INSECTS AFFECTING PARK AND WOODLAND TREES 



499 



Cratoparis lunatus Fabr. 



A rather stout, narrow^grayish brown mottled beetle about % inch in length, may 

 be found on fungi growing on maple and beech stumps, often associated with Hop loce- 

 phala bicornis Oliv., in April and May. It also occurs in September. 



The head of this peculiar beetle is distinctly prolonged and the front 

 thickly clothed with yellowish, grayish scales. Mandibles very large, eyes 

 rather large and finely granulate ; prothorax tapering anteriorly, slightly 

 swollen near the middle and thickly clothed with yellowish gray pubescence, 

 sparse posteriorly and exposing the dark brown chitin. The wing covers are 

 strongly striate with coarse, distinct punctures and thickly clothed with yellow, 

 brownish and almost black pubescence, giving the insect a peculiar mottled 

 appearance. 



NATURAL ENEMIES OF BARK BORERS 



There are a number of natural enemies of bark borers, some of which 

 occur on the bark or in the galleries, and one not conversant with their 

 habits might easily mistake them for destructive species. A few of the 

 more important of these beneficial forms are noticed briefly on the 

 following pages. 



Ibalia maculipennis Hald. 



This striking and peculiar cynipid was taken at Poughkeepsie N. Y. 

 ovipositing on hickory infested with 

 Dicerca obscura var. 1 u r i d a 

 Fabr., and a species of tremex. The 

 European I. c u 1 1 e 1 1 a t o r Latr., 

 has been recorded as a rare parasite 

 on tremex and it is possible that this 

 species has similar habits. 



It is a small, wasplike insect 

 about inch long, with the mem- 

 branous wings clouded near the 

 middle and at the tip. It is black, marked with yellowish and at once 

 recognizable because of the very strongly compressed abdomen with its 

 alternate irregular bands of black and yellowish white. 



i is 



Ibalia maculipennis, side view, enlarged 

 (original) 



