A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 121 



finely granulose ; last visible sternite semicircularly emarginate at apex, without 

 a submarginal ridge, lateral margins serrate ; eighth tergite coarsely, sparsely 

 punctate, broadly, deeply, angularly emarginate at apex, but not longitudinally 

 carinate. Prosternum coarsely, densely punctate, more or less rugose anteriorly, 

 rather densely clothed with long, semierect, white hairs ; anterior margin slightly 

 rounded, without a median lobe. Anterior femur with a large, obtuse tooth, 

 which is dentate on outer margin. Anterior tibia slightly arcuate, with a rounded 

 dilation near apex, and grooved and flattened behind the dilation ; middle tibia 

 slightly arcuate, and slightly flattened at apical fourth ; posterior tibia straight. 

 Length 8 mm., width 3.5 mm. 



Redescribed from a male in the United States National Museum, 

 collected on white pine at Stoughton, Mass., by Mrs. D. H. Blake. 



Female. — Differing from the male in having the front of the head, the pro- 

 notum, and the underside of the body bluish green, the antenna bronzy green, 

 the last visible sternite slightly notched at apex, the eighth tergite coarsely, 

 densely punctured, and broadly rounded at apex, the prosternum sparsely pubes- 

 cent, and the anterior tibia unarmed near apex. 



Type locality. — Of harrisi, Massachusetts; of chlorocephala, 

 "Amerique Boreale." Present location of types unknown to the writer. 



Distribution. — Material has been examined from Ottawa and New 

 Brunswick, Canada, the District of Columbia, and various locali- 

 ties in the following States : Maine, Maryland, Massachusetts, Michi- 

 gan, New Hampshire, North Carolina, Pennsylvania, Rhode Island, 

 South Carolina, and Virginia. It has also been recorded in the litera- 

 ture from Quebec, Canada, and Alabama, Connecticut, Florida, and 

 Georgia. 



Hosts. — Harris (1829) records the larvae as inhabiting the small 

 limbs of northern white pine {Pinus strobus Linnaeus) and Knull 

 (1920) reared the adults from small branches of Virginia pine {Pinus 

 mrginiana Miller) in Pennsylvania. Chamberlin (1926) records 

 the host as pitch pine {Pinus rigida Miller). Manee (1913) records 

 collecting the adults on common winterberry {Ilex verticillata (Lin- 

 naeus) Gray) , but it is probably not the host plant for this species. 



This species varies in color from light green to a dark violaceous 

 blue, and the underside of the body (except abdomen) in some of the 

 males is distinctly purplish red, with a distinct golden reflection. The 

 clypeus is more shallowly emarginate in some specimens than in others, 

 and in some examples there is an obsolete discal fovea at the apical 

 third of the elytron, but this fovea is never distinct. In some ex- 

 amples the median sulcus on the pronotum is only slightly indicated, 

 and the surface is rather deeply depressed near the lateral margins. 

 The sides of the pronotum are usually sinuate, or more or less emar- 

 ginate at the middle, but in a few specimens the pronotum is widest 

 at the apical third, with the sides arcuately converging posteriorly. 

 The tip of the last visible abdominal sternite in the female is either 

 rounded or slightly notched. The length is from 6.5 to 9 mm. 



Hentz described the species from a specimen collected during the 

 month of May, but it is impossible to determine the sex from the 

 description. The original spelling is "harrissi" which is a typo- 

 graphical error for harrisi. 



