TRIBE I. CRYI'IIALIXI. 615 



XV. XYLEBORUS Eichhoff, 1864. (Gr., "wood" -f "eat.") 



This genus, as restricted by Dr. Hopkins, is distinguished by 

 the 5-jointed funicle, with joint 5 short and broad; clnb short, 

 broad, anterior face obliquely truncate, with one or two recurved 

 sutures, posterior face without sutures ; pronotum longer than 

 broad, with sides parallel or slightly narrowed toward base, 

 apical margin broadly rounded, without serrations ; eyes ellip- 

 tical, emarginate. These insects enter green sap and heart wood 

 of logs, stumps and injured and living trees, mainly hardwood 

 of many species, causing black "piuholes," a serious damage to 

 lumber. 



SYNOPSIS OF SPECIES OF XYLEBORUS. 



a. Apex of elytra obtuse, with a prominent acute granule each side, 

 ft. Declivity with interspace 1 unarmed, interspace 3 armed with acute 

 granules toward apex. 981. QUERCUS. 



?)?;. Declivity with interspaces 1 and 3 armed with rows of granules. 



c. Elytral intervals faintly rugose and subopaque. 982. SAXESENI. 

 cc. Elytral intervals smooth and shining. 



<7. Declivity with interspace 2 scarcely impressed. 983. PECANIS. 

 (Id. Declivity with interspace 2 strongly impressed. 



984. FLORIDENSIS. 



flo. Apex of elytra broadly to subacuminately rounded, without prominent 



granules or tooth each side of apex. 

 e. Elytral declivity interspace 1 armed with granules. 



f. Declivity opaque, with rows of shining discs in place of strial 



puncture?. 



g. Pronotum flat, longitudinally impressed. 985. PLANICOLLTS. 

 gg. Pronotum convex. 986. INEKMTS. 



//. Declivity subopaque, with obscure rows of shallow punctures. 



987. AFFIXIS. 

 iff. Declivity shining. 



7(. Declivity oblique, flattened to subconvex, sublateral margin 



acute. 



i. Declivity flat, strial punctures fine. 988. RTLEYI. 



ii. Declivity subconvex. 



j. Elytra glabrous toward base, stria? indistinct. 



989. HTJBBARDI. 



j}. Elytra sparsely pubescent toward base, striae distinct. 



990. SCHWARZI. 



Hfi. Declivity convex, sublateral margin obtuse. 



fc. Stria? scarcely impressed, punctures fine. 991. HOWARDI. 



/cTc. Striae impressed, punctures moderately coarse. 



1. Pronotum with subeiongate dorsal elevation. 992. FITCHI. 

 II. Pronotum with round dorsal elevation. 993. XYLOGRAPHUS. 

 ee. Elytral declivity interspace 1 unarmed. 



m. Declivity shining, apex not obtusely rounded. 



n. Declivity subconvex, with two coarser denticles on third in- 

 terspace. 994. 



