INSECTS AFFECTING PARK AND WOODLAND TREES 



6 57 



Dicerca tenebrosa Kirby 



An ashy bronze or obscurely bronze, flattened, metallic beetle from a little over x /z to 

 nearly y± inch long occurs on white pine from midsummer to October. 



This insect has been described by LeConte as follows : 



Ashy bronze or obscurely bronze, the prothorax dilated on the sides, 

 which are rounded in front, sinuous behind, coarsely punctured ; behind 

 broadly excavated on each side, with apical and basal shining smooth rugos- 

 ities ; a definite dorsal deep furrow with smooth sides, somewhat interrupted 

 in the middle ; elytra densely punctured, with alternate oblong, raised, shin- 

 ing interstitial spaces, prolonged entire to the apex; length .57 to .75 inch. 

 Male with the pectus broadly sulcate, villose ; the intermediate tibiae armed 

 with an internal acute tooth ; the last ventral segment truncate emarginate. 

 Female with the pectus smoother, less sulcate ; the last ventral segment 

 tridentate ; the intermediate tooth obtuse, defined by minute incisions. 



LeConte also adds the following regarding this species : 



The under surface is copper-colored, coarsely and densely punctured on 

 the sides, abdomen and presternum, less densely on the metasternum and 

 middle of the first segment of the abdomen ; the divided portions of the 

 mesosternum are coarsely and tolerably densely punctured. The outer 

 costae of the thorax are interrupted so as to form on each side an apical 

 and basal callosity. A female from Newfoundland differs by the epipleurae 

 being green, the under surface of the prolonged extremity of the elytra 

 blue, and by the incisures between the anal teeth being more widely 

 separated. 



Beetles belonging to this species were taken in July on arbor-vitae at 

 Big Moose, and a specimen found in June 1900, at Saranac Inn. It is 

 recorded as being abundant at Lake Superior, and according to Kirby, has 

 been taken in latitude 65 in the Rocky mountains. The beetle has also 

 been taken under the bark of white pine in the Adirondacks by Mr George 

 Hunt. Mr Blanchard records finding it in Massachusetts on spruce wood 

 piles and logs in June and also lists it from New Hampshire. 



Chrysobothris dentipes Germ. 



An oblong, oval, flattened, bronzed or purplish beetle,- copper-colored beneath and 

 about Y-2, inch long, occurs in small numbers on hard pine. 



This species was somewhat rare on hard pines at Karner in 1901. It 



is similar in coloration to C. floricola Gory, though it is considerably 



