INSECTS AFFECTING PARK AND WOODLAND TREES 



499 



Cratoparis lunatus labr. 

 A rather stout, narrow, grayisli brown mottled beetle about J4 inch in length, may 

 be found on fungi growing on maple and beech stumps, often associated with H o p 1 o t e- 

 phala bicornis Oliv, in April and May. It also occurs in Se|ilember. 



Till- head of lliis peculiar beetle is distinctly prolonged and the front 

 thickly clothed with )x-llowish, 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 i)ubescence, 

 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. 



NATIUAI. KXEMIES OF It AUK liOUKKS 



There are a nimibcr of natural enemies of bark l)orers, 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 [)ages. 



Ibalia maculipennis llald. 



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

 ovipositing on hickory infested with 

 D i c e r c a o b s c u r a \ar. 1 u r i d a 

 Fabr., and a species of trcnux. I he 

 European I. c u 1 t 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 hai/its. 



It is a small, wasplike insect 

 about 5 ii inch long, with the mem- 

 branous wings clouded near the 

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

 recognizable because of the very strongly compressed abdomen with its 

 alternate irregular bands of black and yellowish white. 



Fig. 12S 1 l> ;« I i a III ac »i i p c n 11 i s, side view, cnlarj;;ed 

 (oricinall 



