FA M ILY IV. SCOLYTID.E. 



k. Declivity of elytra more or less concave. 

 7. Margin of declivity crenate or tuberculate. 

 m. Declivity retuse, deeply concave, margins crenate. 



1014. PULCHELIATS. 



mm. Declivity slightly retuse, broadly concave, margin with 

 three or four inequalities. 1015. rusio. 



77. Margin of declivity simple. 



n. A patch of thick yellow silky hair each side of thorax. 



1016. COMATUS. 



nn. Thorax without patch of hair. 1017. LATJTUS. 



7,-T,-. Declivity feebly or not concave. 



o. Declivity feebly concave. 1018. OBLIQUUS. 



oo. Declivity not retuse or concave. 1019. OPACULUS. 



aa. Male without brush of hair on front of head.* 



p. Elytra strongly punctured, partly in rows; declivity strongly re- 

 tuse, a few asperities on elevation, suture deeply impressed on 

 declivity. 1020. CAKIXICEPS. 



pp. Elytra with regular rows of coarse punctures; declivity hardly 

 retuse. 1021. COXTPERDA. 



1005 (9062). PITYOPJITHORUS MixrTissmrs Zimm., 1868, 143. 



Cylindrical, slender. Black, antennae and feet pale brown; front of 

 male clothed with long yellow hairs. Thorax roughly tuberculate in front, 

 smooth and shining behind. Elytra clothed with a fine, short gray pubes- 

 cence; behind obtusely rounded, without tubercles. Male, heac deeply 

 concave, edges of concavity fringed with long, yellow, silky hairs. Fe- 

 male, head punctured, slightly hairy. Length 1.6 1.8 mm. 



Starke Co., Ind., rare; May 6 0. Ranges from Quebec and 

 New England to Michigan and Florida. Infests black-jack and 

 chestnut oaks and dogwood. In West Virginia this species enters 

 green and dead bark on injured and dead branches and tops of 

 trees, causing slight, if any damage. (Hopkins.) Throughout 

 New Jersey, in oak twigs; adults may be cut out any time during 

 the winter. (Smith.) District of Columbia, under oak bark. 

 Florida under oak bark in June. Felt (101)5) mentions the great 

 numbers of this species at Manor, N. Y., Oct. 3, mining the bark 

 of piled red oak cord wood, probably cut the preceding winter. 

 It runs its galleries transversely to the bark fibre, depositing 

 eggs on either side, the young hatching therefrom work at nearly 

 right angles to the parental grooves. The synonymy of pit stilus 

 Harris is stated bv Eichhoff. 



*The last two species indicate a separate genus by the male characters (for which 

 see descriptions below) alone, for which no names are here supplied to avoid conflict 

 with unpublished descriptions of Dr. Hopkins. Some species heretofore cited as Pity- 

 ophthorus will be found elsewhere, e. g. futlhis in Pityogcnes, liispiduliis in Hypothcnc- 

 mus, etc. The following species cited in Smith's New Jersey List are undescribed, viz., 

 bellus, fagi and frotitalis. The entire arrangement of the genus is provisional, based 

 solely on published descriptions, and will be superseded by the Department of Agricul- 

 ture publications later. 



