A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 105 



vals finely granulose ; last visible sternite broadly, deeply, arcuately emarginate 

 at apex, without a submarginal ridge, lateral margins serrate ; eighth tergite 

 slightly emarginate at apex, coarsely, sparsely punctate, but not longitudinally 

 carinate. Presternum coarsely, densely punctate, sparsely clothed with long, 

 erect, white hairs; anterior margin broadly rounded, with a short, broad, me- 

 dian lobe. Anterior femur with a short, broadly triangular tooth, which is 

 slightly dentate on outer margin. Anterior and middle tibiae arcuate, the 

 former with a small, rounded dilation at apex ; posterior tibia straight. 

 Length 7 mm., width 2.75 mm. 



Redescribed from a male in the U. S. National Museum, collected 

 at West Point, N. Y., June 18, 1911, by W. Eobinson. 



Female. — Differing from the male in having the front of the head uniformly 

 brownish cupreous and more sparsely pubescent, the last visible sternite more 

 elongate and shallowly emarginate at apex, the eighth tergite broadly rounded 

 at apex and more coarsely, sparsely punctured, and indistinctly pubescent, and 

 the anterior tibia unarmed at apex. 



Type locality. — Of pusilla, "Amerique Boreale"; type supposed to 

 be in the collection of Rene Oberthur, but not examined by the 

 writer. Of aegrota^ "Amer. bor.," and of strangulata, Pennsylvania; 

 present location of these types unknown to writer. 



Distribution. — This species is widely distributed over the eastern 

 part of the United States but has not been found west of the Mis- 

 sissippi River. Material has been examined from the District of 

 Columbia and various localities in the following States: Maryland, 

 Massachusetts, Michigan, New Jersey, New York, North Carolina, 

 Pennsylvania, Virginia, and West Virginia. 



It has also been recorded in the literature from Alabama and 

 from Ontario, Canada. 



Hosts. — Knull (1920, 1921) records pusilla as breeding in the sap- 

 wood on dead branches of pitch pine (Pinus rigida Miller) and east- 

 ern hemlock (Tsuga canadensis (Linnaeus) Carriere) collected in 

 Pennsylvania. Hopkins (1899) reared the adults from larvae found 

 in spruce (Picea sp.) bark collected in West Virginia. Chamberlin 

 (1926) records the hosts as white spruce (Picea glauca (Moench) 

 Voss), northern white pine (Pinus strobus Linnaeus), and shortleaf 

 pine (Pinus echinata Miller). The above records from Picea by 

 Hopkins and Chamberlin may refer to neopusilla. 



The color on the dorsal surface of the body is usually rather con- 

 stant, but occasionally specimens are found that are more cupreous, 

 in which case the foveae on the elytra are more greenish. In many 

 cases the pronotum is widest near the apex, with the sides strongly 

 converging posteriorly, the median depression on the disk obsolete, 

 and the anterior margin is without or with an indistinct median lobe. 

 The sides of the elytra are either parallel or slightly diverging from 

 the humeral angles to the apical third. The foveae on the elytra 

 are more distinct and more strongly depressed in some examples, 

 whereas in others the costae and foveae are scarcely visible. The 

 length is from 6.25 to 8 mm. 



LeConte (1859), after examining the type of pusilla in Europe, 

 placed strangulata Melsheimer as a synonym of that species. 



